/* ============================================
   Design System - 하늘 꿈나무 어린이집
   ============================================ */

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

/* Design Tokens */
:root {
    /* Colors - from existing site */
    --color-primary: #4FC3F7;
    --color-primary-light: #B3E5FC;
    --color-primary-dark: #0288D1;
    --color-secondary: #FF8A65;
    --color-secondary-light: #FFCCBC;
    --color-accent: #81C784;
    --color-accent-light: #C8E6C9;

    /* Neutral Colors */
    --color-dark: #333333;
    --color-gray: #6c757d;
    --color-gray-light: #adb5bd;
    --color-border: #dee2e6;
    --color-bg-light: #F8F9FA;
    --color-bg-section: #f8fbff;
    --color-white: #FFFFFF;

    /* Footer Colors */
    --color-footer-bg-start: #2c3e50;
    --color-footer-bg-end: #34495e;
    --color-footer-text: #bdc3c7;
    --color-footer-muted: #95a5a6;

    /* Spacing Scale (8px base) */
    --space-xs: 0.25rem;   /* 4px */
    --space-sm: 0.5rem;    /* 8px */
    --space-md: 1rem;      /* 16px */
    --space-lg: 1.5rem;    /* 24px */
    --space-xl: 2rem;      /* 32px */
    --space-2xl: 3rem;     /* 48px */
    --space-3xl: 4rem;     /* 64px */
    --space-4xl: 5rem;     /* 80px */

    /* Typography */
    --font-primary: 'Pretendard Variable', 'Pretendard', -apple-system, sans-serif;
    --font-heading: 'Pretendard Variable', 'Pretendard', -apple-system, sans-serif;
    --font-accent: 'Gowun Dodum', 'Pretendard Variable', sans-serif;

    --text-xs: 0.75rem;    /* 12px */
    --text-sm: 0.875rem;   /* 14px */
    --text-base: 1rem;     /* 16px */
    --text-lg: 1.125rem;   /* 18px */
    --text-xl: 1.25rem;    /* 20px */
    --text-2xl: 1.5rem;    /* 24px */
    --text-3xl: 2rem;      /* 32px */
    --text-4xl: 2.5rem;    /* 40px */

    --leading-tight: 1.25;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;

    --weight-normal: 400;
    --weight-medium: 500;
    --weight-bold: 700;
    --weight-extra-bold: 800;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 10px;
    --radius-lg: 15px;
    --radius-full: 50px;
    --radius-circle: 50%;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 15px 40px rgba(0, 0, 0, 0.15);
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --duration-fast: 0.15s;
    --duration-normal: 0.3s;
    --duration-slow: 0.5s;
    --duration-hero: 1s;
    --ease-default: ease;
    --ease-in-out: ease-in-out;

    /* Layout */
    --container-max: 1200px;
    --header-height: 80px;
    --nav-font-size: 1.1rem;
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    line-height: var(--leading-normal);
    color: var(--color-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: var(--leading-tight);
    color: var(--color-dark);
    font-weight: var(--weight-bold);
}

/* Container */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Links */
a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--duration-normal) var(--ease-default);
}

a:hover {
    color: var(--color-primary-dark);
}

/* Images */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Skip to Content (Accessibility) */
.skip-to-content {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    z-index: 10000;
    font-weight: var(--weight-bold);
    transition: top var(--duration-fast);
}

.skip-to-content:focus {
    top: var(--space-sm);
    color: var(--color-white);
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 2px;
}

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

/* ---- Animations ---- */

/* Fade-in-up on scroll */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.95);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

@keyframes pulse-soft {
    0%, 100% { box-shadow: 0 0 0 0 rgba(79, 195, 247, 0.3); }
    50% { box-shadow: 0 0 0 8px rgba(79, 195, 247, 0); }
}

/* Scroll reveal base */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger delays for grid children */
.reveal-stagger > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > *:nth-child(2) { transition-delay: 0.1s; }
.reveal-stagger > *:nth-child(3) { transition-delay: 0.2s; }
.reveal-stagger > *:nth-child(4) { transition-delay: 0.3s; }
.reveal-stagger > *:nth-child(5) { transition-delay: 0.4s; }
.reveal-stagger > *:nth-child(6) { transition-delay: 0.5s; }

/* 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-width: 0;
}