/* ============================================
   Age Calculator - Styles
   Sky Blue Theme (#0ea5e9)
   ============================================ */

/* CSS Variables */
:root {
    /* Colors - Sky Blue Theme */
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1f2937;
    --accent-primary: #0ea5e9;
    --accent-light: #38bdf8;
    --accent-dark: #0284c7;
    --accent-glow: rgba(14, 165, 233, 0.4);
    --accent-green: #22c55e;
    --accent-red: #ef4444;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: rgba(56, 189, 248, 0.2);
    --glass-bg: rgba(17, 24, 39, 0.7);
    --glass-border: rgba(56, 189, 248, 0.15);

    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px var(--accent-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

/* Screen reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ============================================
   Animated Background
   ============================================ */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.bg-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 50% 0%, rgba(14, 165, 233, 0.15) 0%, transparent 50%),
                radial-gradient(ellipse at 100% 100%, rgba(14, 165, 233, 0.1) 0%, transparent 40%),
                radial-gradient(ellipse at 0% 100%, rgba(56, 189, 248, 0.08) 0%, transparent 40%);
}

.bg-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.bg-orb--1 {
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.3) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.bg-orb--2 {
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.25) 0%, transparent 70%);
    bottom: 20%;
    left: -50px;
    animation-delay: -7s;
}

.bg-orb--3 {
    width: 250px;
    height: 250px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.2) 0%, transparent 70%);
    top: 50%;
    right: 10%;
    animation-delay: -14s;
}

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

/* ============================================
   Site Navigation
   ============================================ */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(10, 15, 26, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.site-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.125rem;
}

.site-nav__icon {
    color: var(--accent-primary);
    font-size: 1.25rem;
}

.site-nav__text {
    color: var(--text-primary);
}

.site-nav__accent {
    color: var(--accent-primary);
}

/* ============================================
   Header
   ============================================ */
.header {
    padding: var(--spacing-lg) var(--spacing-lg);
    margin-top: 60px;
    text-align: center;
}

.header-content {
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-primary);
    margin: 0;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1rem;
    color: var(--text-secondary);
    margin: var(--spacing-xs) 0 0 0;
}

/* ============================================
   Main Content
   ============================================ */
.main {
    flex: 1;
    max-width: 800px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    width: 100%;
}

.section {
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Glass Card Effect
   ============================================ */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.glass-card:hover {
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-light);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* ============================================
   Input Section
   ============================================ */
.section-header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 0;
}

.input-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    align-items: center;
}

.date-input-wrapper {
    position: relative;
    width: 100%;
    max-width: 300px;
}

.date-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    padding-right: 50px;
    background: var(--bg-tertiary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 1.125rem;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.date-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.date-input::-webkit-calendar-picker-indicator {
    opacity: 0;
    cursor: pointer;
}

.date-icon {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--accent-primary);
    pointer-events: none;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: none;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn:active:not(:disabled) {
    transform: scale(0.98);
}

.btn-calculate {
    background: linear-gradient(135deg, var(--accent-primary) 0%, var(--accent-dark) 100%);
    color: white;
    box-shadow: 0 4px 15px var(--accent-glow);
}

.btn-calculate:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-primary) 100%);
    box-shadow: 0 6px 20px var(--accent-glow);
    transform: translateY(-2px);
}

.btn-share {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
}

.btn-share:hover:not(:disabled) {
    background: var(--bg-secondary);
    border-color: var(--accent-primary);
    color: var(--accent-light);
}

/* ============================================
   Age Display Card
   ============================================ */
.age-card {
    text-align: center;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, var(--glass-bg) 100%);
}

.age-display {
    padding: var(--spacing-lg) 0;
}

.age-primary {
    margin-bottom: var(--spacing-xl);
}

.age-number {
    font-family: var(--font-mono);
    font-size: 5rem;
    font-weight: 700;
    color: var(--accent-light);
    text-shadow: 0 0 40px var(--accent-glow);
    display: block;
    line-height: 1;
}

.age-label {
    font-size: 1.5rem;
    color: var(--text-secondary);
    display: block;
    margin-top: var(--spacing-sm);
}

.age-breakdown {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
}

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

.unit-value {
    font-family: var(--font-mono);
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
}

.unit-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ============================================
   Stats Card
   ============================================ */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(14, 165, 233, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-light);
    display: block;
    word-break: break-all;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-top: var(--spacing-xs);
    display: block;
}

/* ============================================
   Countdown Card
   ============================================ */
.countdown-display {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.countdown-item {
    text-align: center;
    min-width: 60px;
}

.countdown-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-light);
    display: block;
    line-height: 1;
    text-shadow: 0 0 20px var(--accent-glow);
}

.countdown-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: var(--spacing-xs);
    display: block;
}

.countdown-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
}

.countdown-message span {
    color: var(--accent-light);
    font-weight: 600;
}

/* ============================================
   Birth Info Card
   ============================================ */
.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(14, 165, 233, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
}

.info-icon {
    font-size: 1.5rem;
    min-width: 40px;
    text-align: center;
}

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

.info-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ============================================
   Fun Facts Card
   ============================================ */
.facts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.fact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(14, 165, 233, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid var(--glass-border);
    transition: all var(--transition-fast);
}

.fact-item:hover {
    background: rgba(14, 165, 233, 0.1);
    border-color: var(--accent-primary);
}

.fact-icon {
    font-size: 1.5rem;
    min-width: 40px;
    text-align: center;
}

.fact-text {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* ============================================
   Share Card
   ============================================ */
.share-buttons {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-sm);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: rgba(10, 15, 26, 0.9);
    backdrop-filter: blur(12px);
    border-top: 1px solid var(--glass-border);
    padding: var(--spacing-md) var(--spacing-lg);
    margin-top: auto;
}

.footer-content {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

.footer-credit a {
    color: var(--accent-primary);
    text-decoration: none;
}

.footer-credit a:hover {
    color: var(--accent-light);
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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


/* ============================================
   Toast Notification
   ============================================ */
.toast {
    position: fixed;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 1001;
    opacity: 0;
    transition: all var(--transition-normal);
    border-left: 4px solid var(--accent-primary);
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    border-left-color: var(--accent-green);
}

.toast.error {
    border-left-color: var(--accent-red);
}

/* ============================================
   Results Section Animation
   ============================================ */
.results-section {
    animation: fadeInUp 0.5s ease-out;
}

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

.results-section .glass-card {
    animation: fadeInUp 0.5s ease-out;
    animation-fill-mode: both;
}

.results-section .glass-card:nth-child(1) { animation-delay: 0.1s; }
.results-section .glass-card:nth-child(2) { animation-delay: 0.2s; }
.results-section .glass-card:nth-child(3) { animation-delay: 0.3s; }
.results-section .glass-card:nth-child(4) { animation-delay: 0.4s; }
.results-section .glass-card:nth-child(5) { animation-delay: 0.5s; }
.results-section .glass-card:nth-child(6) { animation-delay: 0.6s; }

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 640px) {
    .logo {
        font-size: 1.5rem;
    }

    .main {
        padding: var(--spacing-md);
    }

    .glass-card {
        padding: var(--spacing-lg);
    }

    .age-number {
        font-size: 3.5rem;
    }

    .age-label {
        font-size: 1.125rem;
    }

    .age-breakdown {
        gap: var(--spacing-xl);
    }

    .unit-value {
        font-size: 1.5rem;
    }

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

    .stat-value {
        font-size: 1.125rem;
    }

    .countdown-display {
        gap: var(--spacing-md);
    }

    .countdown-value {
        font-size: 1.75rem;
    }

    .countdown-item {
        min-width: 50px;
    }

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

    .share-buttons {
        grid-template-columns: 1fr;
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }
}

@media (max-width: 480px) {
    .header {
        margin-top: 50px;
    }

    .age-number {
        font-size: 2.5rem;
    }

    .countdown-value {
        font-size: 1.5rem;
    }

    .btn {
        width: 100%;
    }
}

/* High resolution displays */
@media (min-width: 1200px) {
    .main {
        max-width: 900px;
    }
}

/* Reduced motion preference */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    .bg-orb {
        animation: none;
    }
}

/* Print styles */
@media print {
    .site-nav,
    .footer,
    .input-section,
    .share-card,
    .bg-animation {
        display: none !important;
    }

    body {
        background-color: white;
        color: black;
    }

    .glass-card {
        background: #f5f5f5;
        box-shadow: none;
        border: 1px solid #ddd;
    }

    .age-number,
    .countdown-value,
    .stat-value {
        color: #0ea5e9;
        text-shadow: none;
    }
}