/**
 * 자궁세 - Premium Dark Theme
 * Luxury App-like Experience
 */

/* ===================================
   CSS Variables
   =================================== */
:root {
    /* Colors - Dark Premium Palette */
    --color-bg-primary: #0a0a0f;
    --color-bg-secondary: #12121a;
    --color-bg-tertiary: #1a1a2e;
    --color-bg-card: rgba(26, 26, 46, 0.8);

    --color-accent-primary: #ff6b9d;
    --color-accent-secondary: #7c3aed;
    --color-accent-tertiary: #06b6d4;
    --color-accent-gold: #fbbf24;

    --color-text-primary: #ffffff;
    --color-text-secondary: #e8e8f0;
    --color-text-muted: #e8e8f8;

    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;

    --color-border: rgba(255, 255, 255, 0.08);
    --color-border-hover: rgba(255, 255, 255, 0.15);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #ff6b9d 0%, #c44569 50%, #7c3aed 100%);
    --gradient-secondary: linear-gradient(135deg, #7c3aed 0%, #5b21b6 100%);
    --gradient-accent: linear-gradient(135deg, #06b6d4 0%, #0891b2 100%);
    --gradient-gold: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
    --gradient-dark: linear-gradient(180deg, rgba(10, 10, 15, 0) 0%, rgba(10, 10, 15, 1) 100%);
    --gradient-glow: radial-gradient(ellipse at center, rgba(255, 107, 157, 0.15) 0%, transparent 70%);

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-2xl: 32px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 40px rgba(255, 107, 157, 0.3);
    --shadow-glow-purple: 0 0 40px rgba(124, 58, 237, 0.3);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Typography */
    --font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-size-xs: 11px;
    --font-size-sm: 13px;
    --font-size-base: 15px;
    --font-size-lg: 17px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    --font-size-5xl: 48px;

    /* Safe Areas */
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);
}

/* ===================================
   Reset & Base
   =================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.premium-app {
    background: var(--color-bg-primary);
}

/* ===================================
   Ambient Background
   =================================== */
.ambient-bg {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.ambient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.4;
    animation: float 20s ease-in-out infinite;
}

.ambient-orb-1 {
    width: 600px;
    height: 600px;
    background: var(--color-accent-primary);
    top: -200px;
    right: -200px;
    animation-delay: 0s;
}

.ambient-orb-2 {
    width: 500px;
    height: 500px;
    background: var(--color-accent-secondary);
    bottom: -150px;
    left: -150px;
    animation-delay: -7s;
}

.ambient-orb-3 {
    width: 400px;
    height: 400px;
    background: var(--color-accent-tertiary);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: -14s;
    opacity: 0.2;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    25% { transform: translate(30px, -30px) scale(1.05); }
    50% { transform: translate(-20px, 20px) scale(0.95); }
    75% { transform: translate(20px, 10px) scale(1.02); }
}

/* ===================================
   App Shell
   =================================== */
.app-shell {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    min-height: 100dvh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* ===================================
   Glass Morphism
   =================================== */
.glass-morphism {
    background: rgba(26, 26, 46, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
}

.glass-card {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.glass-btn {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.glass-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-border-hover);
}

.glass-btn:active {
    transform: scale(0.98);
}

/* ===================================
   Gradient Effects
   =================================== */
.gradient-bg {
    background: var(--gradient-primary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.gradient-border {
    position: relative;
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-primary);
    border-radius: inherit;
    z-index: -1;
    opacity: 0.5;
}

.gradient-btn {
    background: var(--gradient-primary);
    color: white;
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.gradient-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(255,255,255,0.2) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.gradient-btn:hover::before {
    opacity: 1;
}

/* ===================================
   Header
   =================================== */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-md) var(--space-lg);
    padding-top: calc(var(--safe-top) + var(--space-md));
    transition: all var(--transition-normal);
}

.app-header.scrolled {
    background: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-lg);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.app-logo {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    text-decoration: none;
    color: inherit;
}

.logo-icon {
    font-size: 32px;
    filter: drop-shadow(0 0 10px rgba(255, 107, 157, 0.5));
}

.logo-text h1 {
    font-size: var(--font-size-xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
    line-height: 1.2;
}

.logo-tagline {
    font-size: var(--font-size-xs);
    color: #f0f0ff;
    display: block;
}

.app-nav {
    display: flex;
    gap: var(--space-sm);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    text-decoration: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-normal);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: rgba(255, 255, 255, 0.05);
}

.nav-link.active {
    color: var(--color-accent-primary);
    background: rgba(255, 107, 157, 0.1);
}

.nav-icon {
    font-size: 18px;
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-normal);
}

.menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ===================================
   Hero Section
   =================================== */
.hero-section {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    position: relative;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.8s ease-out;
}

.badge-icon {
    font-size: 16px;
}

.badge-text {
    color: #f0f0f8;
}

.hero-title {
    font-size: clamp(var(--font-size-3xl), 8vw, var(--font-size-5xl));
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
    animation: fadeInUp 0.8s ease-out 0.1s both;
}

.typing-text {
    display: inline-block;
    border-right: 3px solid var(--color-accent-primary);
    animation: blink 1s step-end infinite, float3D 3s ease-in-out infinite;

    /* 3D Neon Glow Effect */
    color: #fff;
    background: linear-gradient(135deg, #ff6b9d 0%, #c44569 30%, #7c3aed 70%, #06b6d4 100%);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: blink 1s step-end infinite, gradientFlow 4s ease infinite, float3D 3s ease-in-out infinite;

    /* 3D Text Shadow - Creates depth illusion */
    filter: drop-shadow(0 0 10px rgba(255, 107, 157, 0.8))
            drop-shadow(0 0 20px rgba(255, 107, 157, 0.6))
            drop-shadow(0 0 40px rgba(124, 58, 237, 0.4))
            drop-shadow(0 0 60px rgba(6, 182, 212, 0.3));

    /* 3D Transform */
    transform-style: preserve-3d;
    perspective: 500px;
    position: relative;
}

/* 3D Extrusion Effect - Background Layer */
.typing-text::before {
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background: linear-gradient(135deg, #ff6b9d 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transform: translateZ(-20px) translateX(2px) translateY(2px);
    opacity: 0.5;
    filter: blur(2px);
}

/* Gradient Flow Animation */
@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 3D Float Animation */
@keyframes float3D {
    0%, 100% {
        transform: translateY(0) rotateX(0deg) scale(1);
    }
    25% {
        transform: translateY(-3px) rotateX(2deg) scale(1.01);
    }
    50% {
        transform: translateY(-5px) rotateX(0deg) scale(1.02);
    }
    75% {
        transform: translateY(-3px) rotateX(-2deg) scale(1.01);
    }
}

@keyframes blink {
    50% { border-color: transparent; }
}

.hero-subtitle {
    font-size: var(--font-size-lg);
    color: #f0f0ff;
    line-height: 1.7;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    color: #f0f0f8;
    font-size: var(--font-size-xs);
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.scroll-arrow {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-full);
    position: relative;
}

.scroll-arrow::before {
    content: '';
    position: absolute;
    width: 4px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scrollBounce 2s ease-in-out infinite;
}

@keyframes scrollBounce {
    0%, 100% { top: 8px; opacity: 1; }
    50% { top: 20px; opacity: 0.3; }
}

/* ===================================
   Sections
   =================================== */
.section {
    padding: var(--space-3xl) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.title-icon {
    font-size: var(--font-size-2xl);
}

.section-subtitle {
    font-size: var(--font-size-base);
    color: #e8e8f8;
}

/* ===================================
   Cards
   =================================== */
.card {
    padding: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.card-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    flex-shrink: 0;
}

.card-title-group {
    flex: 1;
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
}

.card-subtitle {
    font-size: var(--font-size-sm);
    color: #f0f0ff;
    margin: 0;
}

/* ===================================
   Quick Grid
   =================================== */
.quick-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-md);
}

.quick-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
    min-height: 90px;
    position: relative;
    overflow: hidden;
}

.quick-btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.quick-btn:hover::before,
.quick-btn.pressed::before {
    opacity: 1;
}

.quick-year {
    font-size: var(--font-size-lg);
    font-weight: 700;
    position: relative;
    z-index: 1;
    transition: all var(--transition-normal);
}

.quick-age {
    font-size: var(--font-size-sm);
    color: #e0e0f0;
    position: relative;
    z-index: 1;
    transition: all var(--transition-normal);
}

.quick-btn:hover .quick-year,
.quick-btn:hover .quick-age,
.quick-btn.pressed .quick-year,
.quick-btn.pressed .quick-age {
    color: white;
}

/* ===================================
   Form Elements
   =================================== */
.calc-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.segment-wrapper {
    margin-bottom: var(--space-md);
}

.segment-control {
    display: flex;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: 4px;
    position: relative;
}

.segment-btn {
    flex: 1;
    padding: var(--space-md);
    background: none;
    border: none;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    position: relative;
    z-index: 1;
    transition: color var(--transition-normal);
}

.segment-btn.active {
    color: var(--color-text-primary);
}

.segment-indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    transition: all var(--transition-spring);
    width: calc(50% - 4px);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.input-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #e0e0f0;
}

.input-wrapper {
    position: relative;
}

.input-field {
    width: 100%;
    height: 56px;
    padding: 0 var(--space-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text-primary);
    font-size: var(--font-size-lg);
    font-family: inherit;
    outline: none;
    transition: all var(--transition-normal);
    -webkit-appearance: none;
    appearance: none;
}

.input-field:focus {
    border-color: var(--color-accent-primary);
    background: rgba(255, 107, 157, 0.05);
    box-shadow: 0 0 0 4px rgba(255, 107, 157, 0.1);
}

.input-field::placeholder {
    color: var(--color-text-muted);
}

.input-suffix {
    position: absolute;
    right: var(--space-lg);
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    pointer-events: none;
}

.select-field {
    cursor: pointer;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b0' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 18px;
    padding-right: 48px;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

/* ===================================
   Decade & Specific Selector (2-step)
   =================================== */
.decade-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}

.decade-btn {
    padding: var(--space-md) var(--space-sm);
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-align: center;
}

.decade-btn:hover {
    border-color: var(--color-accent-primary);
    background: rgba(255, 107, 157, 0.1);
    transform: translateY(-2px);
}

.decade-btn:active {
    transform: scale(0.98);
}

.decade-btn.active {
    background: var(--gradient-primary);
    border-color: transparent;
    color: white;
    box-shadow: var(--shadow-glow);
}

.specific-selector {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-sm);
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.specific-btn {
    padding: var(--space-md) var(--space-xs);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: center;
}

.specific-btn:hover {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
    transform: scale(1.05);
}

.specific-btn:active {
    transform: scale(0.95);
}

.selected-value {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    background: rgba(255, 107, 157, 0.1);
    border: 2px solid var(--color-accent-primary);
    border-radius: var(--radius-lg);
    margin-top: var(--space-sm);
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.selected-label {
    font-size: var(--font-size-sm);
    color: #e0e0f0;
}

.selected-text {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-accent-primary);
}

.reset-btn {
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.reset-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--color-text-primary);
}

/* ===================================
   Accordion
   =================================== */
.accordion {
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-lg);
}

.accordion-toggle {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: var(--space-md) 0;
    background: none;
    border: none;
    color: var(--color-accent-primary);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    transition: transform var(--transition-normal);
}

.accordion-toggle.open .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-slow);
}

.accordion-content.open {
    max-height: 1000px;
}

/* ===================================
   Toggle
   =================================== */
.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) 0;
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-lg);
}

.toggle-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.toggle-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

.toggle-desc {
    font-size: var(--font-size-xs);
    color: #f0f0f8;
}

.toggle-switch {
    width: 52px;
    height: 32px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: var(--radius-full);
    position: relative;
    cursor: pointer;
    transition: background var(--transition-normal);
}

.toggle-switch.active {
    background: var(--color-accent-primary);
}

.toggle-thumb {
    position: absolute;
    width: 26px;
    height: 26px;
    background: white;
    border-radius: 50%;
    top: 3px;
    left: 3px;
    transition: transform var(--transition-spring);
    box-shadow: var(--shadow-sm);
}

.toggle-switch.active .toggle-thumb {
    transform: translateX(20px);
}

/* ===================================
   Option Cards
   =================================== */
.reusable-options {
    margin-top: var(--space-lg);
}

.option-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.option-card {
    cursor: pointer;
}

.option-card input {
    display: none;
}

.option-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-lg);
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.option-card input:checked + .option-content {
    border-color: var(--color-accent-primary);
    background: rgba(255, 107, 157, 0.1);
}

.option-icon {
    font-size: 28px;
}

.option-name {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ===================================
   Calculate Button
   =================================== */
.btn-calculate {
    height: 60px;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-lg);
    font-weight: 700;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-glow);
    transition: all var(--transition-normal);
}

.btn-calculate:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 60px rgba(255, 107, 157, 0.4);
}

.btn-calculate:active {
    transform: translateY(0);
}

.btn-calculate:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    transition: opacity var(--transition-fast);
}

.btn-icon {
    font-size: 20px;
}

.btn-loader {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
}

.loader-ring {
    width: 28px;
    height: 28px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===================================
   Result Section
   =================================== */
.result-wrapper {
    margin-top: var(--space-2xl);
}

.result-hero {
    text-align: center;
    padding: var(--space-2xl);
    position: relative;
    overflow: hidden;
}

.result-label {
    font-size: var(--font-size-sm);
    color: #f0f0f8;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.result-amount {
    margin-bottom: var(--space-md);
}

.amount-number {
    font-size: clamp(var(--font-size-4xl), 12vw, 72px);
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.amount-unit {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: #f0f0f8;
}

.result-message {
    font-size: var(--font-size-lg);
    color: #e8e8f8;
}

.result-particles span {
    position: absolute;
    width: 10px;
    height: 10px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    opacity: 0.3;
    animation: particle 3s ease-in-out infinite;
}

.result-particles span:nth-child(1) { top: 20%; left: 10%; animation-delay: 0s; }
.result-particles span:nth-child(2) { top: 30%; right: 15%; animation-delay: 0.5s; }
.result-particles span:nth-child(3) { bottom: 25%; left: 20%; animation-delay: 1s; }
.result-particles span:nth-child(4) { top: 15%; right: 25%; animation-delay: 1.5s; }
.result-particles span:nth-child(5) { bottom: 20%; right: 10%; animation-delay: 2s; }
.result-particles span:nth-child(6) { top: 40%; left: 5%; animation-delay: 2.5s; }

@keyframes particle {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.3; }
    50% { transform: translateY(-20px) scale(1.5); opacity: 0.6; }
}

/* ===================================
   Breakdown Grid
   =================================== */
.breakdown-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.breakdown-card {
    padding: var(--space-lg);
    text-align: center;
}

.breakdown-icon {
    font-size: 28px;
    margin-bottom: var(--space-sm);
}

.breakdown-label {
    font-size: var(--font-size-xs);
    color: #f0f0ff;
    margin-bottom: var(--space-xs);
}

.breakdown-value {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* ===================================
   Savings Card
   =================================== */
.savings-card {
    margin-top: var(--space-lg);
    padding: var(--space-xl);
    text-align: center;
    background: linear-gradient(135deg, rgba(16, 185, 129, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
}

.savings-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.savings-icon {
    font-size: 24px;
}

.savings-title {
    font-size: var(--font-size-sm);
    color: #e8e8f8;
}

.savings-amount {
    font-size: var(--font-size-3xl);
    font-weight: 900;
    color: var(--color-success);
    margin-bottom: var(--space-sm);
}

.savings-percent {
    font-size: var(--font-size-sm);
    color: var(--color-success);
    font-weight: 600;
}

/* ===================================
   Stats Card
   =================================== */
.stats-card {
    margin-top: var(--space-lg);
    padding: var(--space-xl);
}

.stats-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.stats-grid {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid var(--color-border);
}

.stat-row:last-child {
    border-bottom: none;
}

.stat-row .stat-label {
    color: #e0e0f0;
    font-size: var(--font-size-sm);
}

.stat-row .stat-value {
    font-weight: 700;
    color: var(--color-accent-primary);
}

/* ===================================
   Chart Card
   =================================== */
.chart-card {
    margin-top: var(--space-lg);
    padding: var(--space-xl);
}

.chart-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.chart-container {
    height: 300px;
    position: relative;
}

/* ===================================
   Comparison Card
   =================================== */
.comparison-card {
    margin-top: var(--space-lg);
    padding: var(--space-xl);
}

.comparison-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.comparison-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--space-md);
}

.comparison-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-md);
}

.comparison-emoji {
    font-size: 28px;
}

.comparison-info {
    display: flex;
    flex-direction: column;
}

.comparison-name {
    font-size: var(--font-size-sm);
    color: #e0e0f0;
}

.comparison-count {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-accent-primary);
}

/* ===================================
   Share Card
   =================================== */
.share-card {
    margin-top: var(--space-lg);
    padding: var(--space-xl);
    text-align: center;
}

.share-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.share-buttons {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.share-btn {
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.share-btn.kakao {
    background: #FEE500;
    color: #000;
}

.share-btn.twitter {
    background: #1DA1F2;
    color: white;
}

.share-btn.copy {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-text-primary);
}

.share-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* ===================================
   Recalculate Button
   =================================== */
.btn-recalculate {
    display: block;
    width: 100%;
    max-width: 300px;
    margin: var(--space-2xl) auto 0;
    padding: var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: 600;
}

/* ===================================
   Plans Section
   =================================== */
.plans-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.plan-card {
    padding: var(--space-xl);
    border-left: 4px solid var(--color-accent-primary);
}

.plan-card[data-type="eco"] { border-left-color: var(--color-success); }
.plan-card[data-type="hybrid"] { border-left-color: var(--color-accent-secondary); }
.plan-card[data-type="comfort"] { border-left-color: var(--color-warning); }
.plan-card[data-type="budget"] { border-left-color: var(--color-accent-tertiary); }

.plan-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.plan-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
    color: var(--color-text-primary);
}

.plan-badge {
    font-size: var(--font-size-xs);
    font-weight: 700;
    color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.plan-description {
    font-size: var(--font-size-sm);
    color: #e8e8f8;
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.plan-tip {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: rgba(255, 107, 157, 0.05);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    color: var(--color-accent-primary);
}

.tip-icon {
    flex-shrink: 0;
}

.plan-meta {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border);
}

.difficulty {
    font-size: var(--font-size-xs);
    color: #f0f0f8;
}

.difficulty.easy { color: var(--color-success); }
.difficulty.medium { color: var(--color-warning); }
.difficulty.hard { color: var(--color-error); }

/* ===================================
   Compare Table
   =================================== */
.compare-card {
    margin-top: var(--space-2xl);
    padding: var(--space-xl);
}

.compare-title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

.compare-table-wrapper {
    overflow-x: auto;
}

.compare-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0 var(--space-sm);
}

.compare-table th,
.compare-table td {
    padding: var(--space-md);
    text-align: center;
}

.compare-table th {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: #e0e0f0;
    text-transform: uppercase;
}

.compare-table td {
    background: rgba(255, 255, 255, 0.03);
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
}

.compare-table tr td:first-child {
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    text-align: left;
    font-weight: 600;
}

.compare-table tr td:last-child {
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.compare-table td.low { color: var(--color-success); }
.compare-table td.medium { color: var(--color-warning); }
.compare-table td.high { color: var(--color-error); }

/* ===================================
   Products Section
   =================================== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.product-card {
    padding: var(--space-xl);
}

.product-icon-wrapper {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.product-icon-wrapper.blue { background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(37, 99, 235, 0.2) 100%); }
.product-icon-wrapper.pink { background: linear-gradient(135deg, rgba(255, 107, 157, 0.2) 0%, rgba(219, 39, 119, 0.2) 100%); }
.product-icon-wrapper.green { background: linear-gradient(135deg, rgba(16, 185, 129, 0.2) 0%, rgba(5, 150, 105, 0.2) 100%); }

.product-icon {
    font-size: 32px;
}

.product-info {
    margin-bottom: var(--space-md);
}

.product-name {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0 0 var(--space-sm);
    color: var(--color-text-primary);
}

.product-meta {
    display: flex;
    justify-content: space-between;
    font-size: var(--font-size-sm);
    color: #f0f0ff;
}

.product-price {
    color: var(--color-accent-primary);
    font-weight: 600;
}

.product-ratings {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.rating {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.rating-label {
    font-size: var(--font-size-xs);
    color: #f0f0f8;
    width: 60px;
}

.rating-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.rating-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
}

/* ===================================
   Product Details
   =================================== */
.product-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
    margin-top: var(--space-2xl);
}

.detail-card {
    padding: var(--space-xl);
}

.detail-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.detail-icon {
    font-size: 28px;
}

.detail-header h4 {
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
    color: var(--color-text-primary);
}

.detail-content {
    font-size: var(--font-size-sm);
    color: #e8e8f8;
    line-height: 1.7;
}

.detail-content p {
    margin-bottom: var(--space-sm);
}

.pros-cons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.pros h5,
.cons h5 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--space-sm);
}

.pros h5 { color: var(--color-success); }
.cons h5 { color: var(--color-warning); }

.pros ul,
.cons ul {
    list-style: none;
    font-size: var(--font-size-xs);
}

.pros li::before,
.cons li::before {
    content: '• ';
}

/* ===================================
   Magazine Section
   =================================== */
.magazine-tabs {
    display: flex;
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
    overflow-x: auto;
    padding-bottom: var(--space-sm);
    -webkit-overflow-scrolling: touch;
}

.tab-btn {
    padding: var(--space-sm) var(--space-lg);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: all var(--transition-normal);
}

.tab-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.tab-btn.active {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: white;
}

.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.article-card {
    padding: var(--space-xl);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    cursor: pointer;
    text-decoration: none;
}

.article-card:hover {
    transform: translateY(-5px);
}

.article-thumb {
    width: 100%;
    height: 140px;
    object-fit: cover;
    border-radius: 12px;
    margin-bottom: var(--space-sm);
}

.article-icon {
    font-size: 32px;
    flex-shrink: 0;
}

.article-content {
    flex: 1;
    min-width: 0;
}

.article-category {
    font-size: var(--font-size-xs);
    color: var(--color-accent-primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.article-title {
    font-size: var(--font-size-base);
    font-weight: 600;
    margin: var(--space-sm) 0;
    line-height: 1.4;
    color: var(--color-text-primary);
}

.article-excerpt {
    font-size: var(--font-size-sm);
    color: #f0f0f8;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

/* ===================================
   Stats Banner
   =================================== */
.stats-banner {
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: var(--space-xl);
    flex-wrap: wrap;
    gap: var(--space-xl);
}

.stat-item {
    text-align: center;
}

.stat-item .stat-value {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-item .stat-label {
    font-size: var(--font-size-sm);
    color: #f0f0ff;
    margin-top: var(--space-xs);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* ===================================
   Shop Section (Coupang Partners)
   =================================== */
.shop-section {
    background: linear-gradient(180deg, transparent 0%, rgba(255, 107, 157, 0.03) 50%, transparent 100%);
}

.shop-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
    max-width: 700px;
    margin: 0 auto;
}

.shop-product-card {
    display: block;
    text-decoration: none;
    padding: var(--space-xl);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-normal);
}

.shop-product-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-glow);
}

.shop-product-card::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.shop-product-card:hover::before {
    opacity: 0.05;
}

.shop-badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    padding: var(--space-xs) var(--space-sm);
    background: var(--gradient-primary);
    color: white;
    font-size: var(--font-size-xs);
    font-weight: 700;
    border-radius: var(--radius-sm);
    z-index: 2;
    animation: pulse 2s ease-in-out infinite;
}

.shop-badge.hot {
    background: var(--gradient-gold);
    color: #000;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.shop-image-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-md);
    margin-bottom: var(--space-md);
    background: rgba(255, 255, 255, 0.02);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.shop-image-wrapper img {
    max-width: 100%;
    max-height: 200px;
    object-fit: contain;
    transition: transform var(--transition-normal);
}

.shop-product-card:hover .shop-image-wrapper img {
    transform: scale(1.05);
}

.shop-product-info {
    text-align: center;
}

.shop-product-name {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-text-primary);
    margin: 0 0 var(--space-xs);
    line-height: 1.4;
}

.shop-product-desc {
    font-size: var(--font-size-sm);
    color: #e0e0f0;
    margin: 0 0 var(--space-md);
}

.shop-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    background: var(--gradient-primary);
    color: white;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.shop-product-card:hover .shop-cta {
    box-shadow: var(--shadow-glow);
    transform: scale(1.05);
}

.shop-cta-arrow {
    transition: transform var(--transition-fast);
}

.shop-product-card:hover .shop-cta-arrow {
    transform: translateX(4px);
}

.affiliate-disclosure {
    text-align: center;
    font-size: var(--font-size-xs);
    color: #f0f0f8;
    margin-top: var(--space-xl);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

/* ===================================
   Footer
   =================================== */
.app-footer {
    margin-top: var(--space-3xl);
    padding: var(--space-2xl) var(--space-lg);
    padding-bottom: calc(var(--safe-bottom) + var(--space-2xl) + 80px);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    gap: var(--space-2xl);
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
}

.footer-desc {
    font-size: var(--font-size-sm);
    color: #f0f0ff;
    margin-top: var(--space-md);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: var(--space-2xl);
}

.footer-group h5 {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-md);
}

.footer-group a {
    display: block;
    font-size: var(--font-size-sm);
    color: #f0f0ff;
    text-decoration: none;
    margin-bottom: var(--space-sm);
    transition: color var(--transition-fast);
}

.footer-group a:hover {
    color: var(--color-accent-primary);
}

.footer-bottom {
    max-width: 1200px;
    margin: var(--space-xl) auto 0;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ===================================
   Bottom Navigation
   =================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-around;
    padding: var(--space-sm) var(--space-lg);
    padding-bottom: calc(var(--safe-bottom) + var(--space-sm));
    z-index: 1000;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-lg);
    transition: all var(--transition-normal);
}

.bottom-nav-item .nav-icon {
    font-size: 22px;
}

.bottom-nav-item.active {
    color: var(--color-accent-primary);
}

.bottom-nav-item:active {
    transform: scale(0.95);
}

/* ===================================
   Toast
   =================================== */
.toast-container {
    position: fixed;
    bottom: 100px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.toast {
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    animation: toastIn 0.3s ease-out;
    box-shadow: var(--shadow-lg);
}

.toast-success {
    background: var(--color-success);
    color: white;
}

.toast-error {
    background: var(--color-error);
    color: white;
}

.toast-info {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.toast.fade-out {
    animation: toastOut 0.3s ease-out forwards;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toastOut {
    to {
        opacity: 0;
        transform: translateY(-20px);
    }
}

/* ===================================
   Loading States
   =================================== */
.loading-spinner {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-2xl);
}

.spinner-ring {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.empty-state,
.error-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--color-text-muted);
}

/* ===================================
   Animations
   =================================== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
    transition-delay: var(--delay, 0s);
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===================================
   Utilities
   =================================== */
.hidden {
    display: none !important;
}

.text-center {
    text-align: center;
}

/* ===================================
   Responsive
   =================================== */
@media (max-width: 768px) {
    .app-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--space-lg);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
        z-index: 999;
    }

    .app-nav.open {
        opacity: 1;
        visibility: visible;
    }

    .app-nav .nav-link {
        font-size: var(--font-size-xl);
        padding: var(--space-md) var(--space-xl);
    }

    .menu-toggle {
        display: flex;
        z-index: 1001;
    }

    .logo-tagline {
        display: none;
    }

    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .form-grid {
        grid-template-columns: 1fr;
    }

    .quick-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .breakdown-grid {
        grid-template-columns: 1fr;
    }

    .comparison-list {
        grid-template-columns: 1fr 1fr;
    }

    .footer-content {
        flex-direction: column;
    }

    .footer-links {
        flex-direction: column;
        gap: var(--space-xl);
    }

    .stats-banner {
        flex-direction: column;
    }

    .stat-divider {
        width: 60px;
        height: 1px;
    }

    .pros-cons {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 769px) {
    .bottom-nav {
        display: none;
    }
}

/* ===================================
   Scrollbar (Desktop)
   =================================== */
@media (min-width: 769px) {
    ::-webkit-scrollbar {
        width: 8px;
    }

    ::-webkit-scrollbar-track {
        background: var(--color-bg-secondary);
    }

    ::-webkit-scrollbar-thumb {
        background: var(--color-border);
        border-radius: var(--radius-full);
    }

    ::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.2);
    }
}

/* Hide scrollbar on mobile */
@media (max-width: 768px) {
    ::-webkit-scrollbar {
        display: none;
    }

    body {
        scrollbar-width: none;
    }
}