/* ============================================
   LIMINAL GALLERY - EASTERN MINIMALIST DESIGN SYSTEM
   Modern & Classic | 여백의 미 (Beauty of Negative Space)
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+KR:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;600;700&family=Playfair+Display:ital,wght@0,400;0,500;0,600;0,700;1,400&family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   DESIGN TOKENS - EASTERN AESTHETIC
   ============================================ */

:root {
    /* COLOR PALETTE - Natural & Subtle */

    /* Primary Colors - 먹과 한지 (Ink & Rice Paper) */
    --ink-black: #1a1a1a;
    --rice-paper: #faf8f3;
    --charcoal: #4a4a4a;
    --stone-grey: #8b8b8b;

    /* Accent Colors - Traditional */
    --celadon: #a8c5b5;
    /* 청자색 */
    --celadon-dark: #8ba899;
    --bronze: #8b7355;
    /* 청동색 */
    --bronze-light: #a89078;
    --vermillion: #c44536;
    /* 주홍 (minimal use) */

    /* Neutral Tones */
    --warm-white: #f5f3ed;
    --cool-grey: #e8e6e0;
    --soft-beige: #ede9e0;
    --mist-grey: #f0eeea;

    /* Semantic Colors */
    --text-primary: var(--ink-black);
    --text-secondary: var(--charcoal);
    --text-tertiary: var(--stone-grey);
    --background-primary: var(--rice-paper);
    --background-secondary: var(--warm-white);
    --border-subtle: var(--cool-grey);
    --accent-primary: var(--celadon);
    --accent-secondary: var(--bronze);

    /* TYPOGRAPHY SYSTEM */

    /* Font Families */
    --font-serif-en: 'Playfair Display', Georgia, serif;
    --font-serif-kr: 'Noto Serif KR', serif;
    --font-sans-en: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-sans-kr: 'Noto Sans KR', sans-serif;

    /* Font Sizes - Fluid Typography */
    --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
    /* 12-14px */
    --text-sm: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
    /* 14-16px */
    --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
    /* 16-18px */
    --text-lg: clamp(1.125rem, 1rem + 0.625vw, 1.375rem);
    /* 18-22px */
    --text-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.625rem);
    /* 20-26px */
    --text-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
    /* 24-32px */
    --text-3xl: clamp(1.875rem, 1.6rem + 1.375vw, 2.625rem);
    /* 30-42px */
    --text-4xl: clamp(2.25rem, 1.9rem + 1.75vw, 3.25rem);
    /* 36-52px */
    --text-5xl: clamp(3rem, 2.5rem + 2.5vw, 4.5rem);
    /* 48-72px */
    --text-6xl: clamp(3.75rem, 3rem + 3.75vw, 6rem);
    /* 60-96px */

    /* Font Weights */
    --weight-light: 300;
    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;

    /* Line Heights - Generous for Readability */
    --leading-tight: 1.2;
    --leading-snug: 1.4;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;
    --leading-loose: 2.0;

    /* Letter Spacing */
    --tracking-tighter: -0.05em;
    --tracking-tight: -0.025em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;
    --tracking-widest: 0.1em;

    /* SPACING SYSTEM - Generous (여백의 미) */

    /* Base Unit: 8px */
    --space-1: 0.5rem;
    /* 8px */
    --space-2: 1rem;
    /* 16px */
    --space-3: 1.5rem;
    /* 24px */
    --space-4: 2rem;
    /* 32px */
    --space-5: 2.5rem;
    /* 40px */
    --space-6: 3rem;
    /* 48px */
    --space-8: 4rem;
    /* 64px */
    --space-10: 5rem;
    /* 80px */
    --space-12: 6rem;
    /* 96px */
    --space-16: 8rem;
    /* 128px */
    --space-20: 10rem;
    /* 160px */
    --space-24: 12rem;
    /* 192px */

    /* Container Widths */
    --container-narrow: 800px;
    --container-medium: 1100px;
    --container-wide: 1400px;
    --container-header: 1600px;
    --container-footer: 1600px;
    --container-padding: 3.75rem;
    /* 60px */

    /* BORDER & RADIUS */

    --border-width: 1px;
    --border-subtle: 1px solid var(--border-subtle);

    --radius-none: 0;
    --radius-sm: 2px;
    --radius-md: 4px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* SHADOWS - Subtle & Natural */

    --shadow-xs: 0 1px 2px rgba(26, 26, 26, 0.04);
    --shadow-sm: 0 2px 4px rgba(26, 26, 26, 0.06);
    --shadow-md: 0 4px 12px rgba(26, 26, 26, 0.08);
    --shadow-lg: 0 8px 24px rgba(26, 26, 26, 0.10);
    --shadow-xl: 0 12px 40px rgba(26, 26, 26, 0.12);

    /* TRANSITIONS - Smooth & Elegant */

    --ease-in: cubic-bezier(0.4, 0, 1, 1);
    --ease-out: cubic-bezier(0, 0, 0.2, 1);
    --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --ease-elegant: cubic-bezier(0.25, 0.46, 0.45, 0.94);

    --duration-fast: 200ms;
    --duration-base: 300ms;
    --duration-slow: 500ms;
    --duration-slower: 700ms;

    /* Z-INDEX SCALE */

    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scroll-behavior: smooth;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--font-sans-en);
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
    color: var(--text-primary);
    background-color: var(--background-primary);
    overflow-x: hidden;
}

/* Korean Language Support */
html[lang="ko"] body {
    font-family: var(--font-sans-kr);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-serif-en);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
}

html[lang="ko"] h1,
html[lang="ko"] h2,
html[lang="ko"] h3,
html[lang="ko"] h4,
html[lang="ko"] h5,
html[lang="ko"] h6 {
    font-family: var(--font-serif-kr);
    letter-spacing: var(--tracking-normal);
}

h1 {
    font-size: var(--text-6xl);
    margin-bottom: var(--space-8);
}

h2 {
    font-size: var(--text-5xl);
    margin-bottom: var(--space-6);
}

h3 {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-5);
}

h4 {
    font-size: var(--text-3xl);
    margin-bottom: var(--space-4);
}

h5 {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-3);
}

h6 {
    font-size: var(--text-xl);
    margin-bottom: var(--space-3);
}

p {
    margin-bottom: var(--space-4);
    line-height: var(--leading-loose);
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-base) var(--ease-elegant);
}

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

a:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 4px;
}

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

/* Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-4);
    background-color: var(--ink-black);
    color: var(--rice-paper);
    padding: var(--space-2) var(--space-4);
    z-index: var(--z-fixed);
    transition: top var(--duration-base) var(--ease-elegant);
    text-transform: uppercase;
    font-size: var(--text-xs);
    letter-spacing: var(--tracking-widest);
}

.skip-link:focus {
    top: var(--space-2);
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */

.container,
.container-narrow,
.container-wide {
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--container-padding);
    padding-right: var(--container-padding);
    width: 100%;
}

.container {
    max-width: var(--container-medium);
}

.container-narrow {
    max-width: var(--container-narrow);
}

.container-wide {
    max-width: var(--container-wide);
}

/* Section Spacing - Generous Vertical Rhythm */
.section {
    padding-top: var(--space-16);
    padding-bottom: var(--space-16);
}

.section-lg {
    padding-top: var(--space-20);
    padding-bottom: var(--space-20);
}

.section-xl {
    padding-top: var(--space-24);
    padding-bottom: var(--space-24);
}

/* ============================================
   NAVIGATION - Minimal & Elegant
   ============================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background-color: transparent;
    transition: all var(--duration-base) var(--ease-elegant);
    padding: var(--space-4) 0;
}

.site-header.scrolled {
    background-color: rgba(250, 248, 243, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-sm);
    border-bottom: var(--border-subtle);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    position: relative;
    min-height: 60px;
}

.header-left {
    flex: 1;
    display: flex;
    justify-content: flex-start;
    z-index: 10;
}

.main-nav {
    flex: 0 0 auto;
    z-index: 5;
}

.header-right {
    flex: 1;
    display: flex;
    justify-content: flex-end;
    z-index: 10;
}

.site-logo {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    line-height: 1;
    text-decoration: none;
    transition: opacity var(--duration-base) var(--ease-elegant);
}

.site-logo:hover {
    opacity: 0.7;
}

.logo-line-1 {
    font-family: var(--font-serif-en);
    font-size: 1.5rem;
    font-weight: var(--weight-semibold);
    letter-spacing: 0.2em;
    color: var(--ink-black);
    margin-bottom: 2px;
}

.logo-line-2 {
    font-family: var(--font-sans-en);
    font-size: 0.7rem;
    font-weight: var(--weight-medium);
    letter-spacing: 0.5em;
    color: var(--text-tertiary);
    text-transform: uppercase;
    padding-left: 2px;
}

.main-nav {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-8);
    align-items: center;
}

.nav-link {
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wide);
    text-transform: uppercase;
    color: var(--text-secondary);
    transition: color var(--duration-base) var(--ease-elegant);
    position: relative;
    padding-bottom: var(--space-1);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background-color: var(--accent-primary);
    transition: width var(--duration-base) var(--ease-elegant);
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ============================================
   BUTTONS - Minimal & Elegant
   ============================================ */

.btn {
    display: inline-block;
    padding: var(--space-3) var(--space-6);
    font-family: inherit;
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    letter-spacing: var(--tracking-wider);
    text-transform: uppercase;
    text-align: center;
    border: var(--border-subtle);
    background-color: transparent;
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--duration-base) var(--ease-elegant);
    text-decoration: none;
}

.btn:hover {
    background-color: var(--ink-black);
    border-color: var(--ink-black);
    color: var(--rice-paper);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-primary {
    background-color: var(--ink-black);
    border-color: var(--ink-black);
    color: var(--rice-paper);
}

.btn-primary:hover {
    background-color: var(--charcoal);
    border-color: var(--charcoal);
}

.btn-accent {
    background-color: var(--celadon);
    border-color: var(--celadon);
    color: var(--ink-black);
}

.btn-accent:hover {
    background-color: var(--celadon-dark);
    border-color: var(--celadon-dark);
}

/* ============================================
   CARDS - Minimal & Elegant
   ============================================ */

.card {
    background-color: var(--background-primary);
    transition: all var(--duration-base) var(--ease-elegant);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-image {
    position: relative;
    overflow: hidden;
    background-color: var(--mist-grey);
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-elegant);
}

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

.card-content {
    padding: var(--space-5);
}

.card-title {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    margin-bottom: var(--space-2);
}

.card-description {
    font-size: var(--text-base);
    color: var(--text-secondary);
    line-height: var(--leading-relaxed);
}

/* ============================================
   LANGUAGE SWITCHER
   ============================================ */

.language-switcher {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.language-switcher button {
    background: none;
    border: none;
    padding: var(--space-1) var(--space-2);
    font-family: inherit;
    font-size: inherit;
    font-weight: var(--weight-medium);
    color: var(--text-tertiary);
    cursor: pointer;
    transition: color var(--duration-base) var(--ease-elegant);
}

.language-switcher button:hover,
.language-switcher button.active {
    color: var(--text-primary);
}

.language-switcher .separator {
    color: var(--border-subtle);
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 1024px) {
    :root {
        --container-padding: 2.5rem;
        /* 40px */
        --space-16: 6rem;
        /* 96px */
        --space-20: 8rem;
        /* 128px */
        --space-24: 10rem;
        /* 160px */
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: 1.5rem;
        /* 24px */
        --space-16: 4rem;
        /* 64px */
        --space-20: 5rem;
        /* 80px */
        --space-24: 6rem;
        /* 96px */
    }

    .nav-menu {
        gap: var(--space-4);
    }

    .main-nav {
        gap: var(--space-4);
    }
}

@media (max-width: 480px) {
    :root {
        --container-padding: 1rem;
        /* 16px */
        --space-16: 3rem;
        /* 48px */
        --space-20: 4rem;
        /* 64px */
        --space-24: 5rem;
        /* 80px */
    }
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Text Alignment */
.text-left {
    text-align: left;
}

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

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

/* Text Colors */
.text-primary {
    color: var(--text-primary);
}

.text-secondary {
    color: var(--text-secondary);
}

.text-tertiary {
    color: var(--text-tertiary);
}

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

/* Background Colors */
.bg-primary {
    background-color: var(--background-primary);
}

.bg-secondary {
    background-color: var(--background-secondary);
}

.bg-mist {
    background-color: var(--mist-grey);
}

/* Spacing Utilities */
.mt-auto {
    margin-top: auto;
}

.mb-auto {
    margin-bottom: auto;
}

.mx-auto {
    margin-left: auto;
    margin-right: auto;
}

/* Display */
.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.flex {
    display: flex;
}

.grid {
    display: grid;
}

.hidden {
    display: none;
}

/* Flex Utilities */
.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Aspect Ratios */
.aspect-square {
    aspect-ratio: 1 / 1;
}

.aspect-portrait {
    aspect-ratio: 3 / 4;
}

.aspect-landscape {
    aspect-ratio: 16 / 10;
}

.aspect-wide {
    aspect-ratio: 21 / 9;
}

/* Overflow */
.overflow-hidden {
    overflow: hidden;
}

/* Transitions */
.transition-all {
    transition: all var(--duration-base) var(--ease-elegant);
}