/* ============================================================
   플레잉코리아 (PLAYING KOREA) — Design System
   태극기(태극/건곤감리) 모티프를 세련되게 재해석한 컬러 시스템
   Font: Nanum Square Round (나눔스퀘어라운드)
   ============================================================ */

@import url("https://cdn.jsdelivr.net/npm/typeface-nanum-square-round@1.0.2/nanumsquareround.css");

:root {
  /* ---------- Taegeuk-inspired Core Palette ---------- */
  /* 태극 청(靑) - 깊은 코발트 블루 */
  --color-blue-900: #0a1f44;
  --color-blue-800: #0f2c5c;
  --color-blue-700: #133d7a;
  --color-blue-600: #164e9c;
  --color-blue-500: #1a5cbf;   /* Primary Blue */
  --color-blue-400: #3b78d8;
  --color-blue-300: #6d9aec;
  --color-blue-100: #e8f0fc;
  --color-blue-50:  #f4f8fe;

  /* 태극 홍(紅) - 세련된 딥 레드 */
  --color-red-900: #4a0d13;
  --color-red-800: #6b131b;
  --color-red-700: #8f1a22;
  --color-red-600: #b8232b;
  --color-red-500: #cd2e36;   /* Primary Red */
  --color-red-400: #de5a56;
  --color-red-300: #ec8b87;
  --color-red-100: #fbe8e7;
  --color-red-50:  #fdf4f3;

  /* 흑(黑) - 잉크 블랙 (건곤감리 괘) */
  --color-ink-900: #0b0d12;
  --color-ink-800: #14171d;
  --color-ink-700: #21252e;
  --color-ink-600: #333947;
  --color-ink-500: #4a5162;
  --color-ink-400: #6b7280;
  --color-ink-300: #9aa1ae;
  --color-ink-200: #c7ccd4;
  --color-ink-100: #e6e9ed;

  /* 백(白) - 배경 화이트 */
  --color-white: #ffffff;
  --color-paper: #fafbfc;      /* 미묘한 오프화이트 배경 */
  --color-paper-alt: #f3f5f8;

  /* ---------- Semantic Aliases ---------- */
  --primary: var(--color-blue-500);
  --primary-dark: var(--color-blue-700);
  --primary-light: var(--color-blue-100);
  --accent: var(--color-red-500);
  --accent-dark: var(--color-red-700);
  --accent-light: var(--color-red-100);
  --ink: var(--color-ink-900);
  --ink-soft: var(--color-ink-600);
  --ink-muted: var(--color-ink-400);
  --surface: var(--color-white);
  --bg: var(--color-paper);
  --border-color: var(--color-ink-100);

  /* Gradients — 태극 문양의 청/홍 곡선을 은유 */
  --gradient-taegeuk: linear-gradient(135deg, var(--color-blue-600) 0%, var(--color-blue-500) 45%, var(--color-red-500) 100%);
  --gradient-blue: linear-gradient(135deg, var(--color-blue-700) 0%, var(--color-blue-500) 100%);
  --gradient-red: linear-gradient(135deg, var(--color-red-700) 0%, var(--color-red-500) 100%);
  --gradient-ink: linear-gradient(135deg, var(--color-ink-900) 0%, var(--color-blue-900) 100%);
  --gradient-hero: radial-gradient(circle at 20% 20%, rgba(26,92,191,0.16) 0%, transparent 45%),
                    radial-gradient(circle at 85% 75%, rgba(205,46,54,0.14) 0%, transparent 45%),
                    linear-gradient(180deg, #0a1f44 0%, #0f2c5c 55%, #14315f 100%);

  /* ---------- Typography ---------- */
  --font-primary: "NanumSquareRound", "Noto Sans KR", -apple-system, BlinkMacSystemFont, "Malgun Gothic", sans-serif;
  --font-display: "NanumSquareRound", "Noto Sans KR", sans-serif;

  /* ---------- Spacing Scale ---------- */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-8: 3rem;
  --space-10: 4rem;
  --space-12: 6rem;
  --space-16: 8rem;

  /* ---------- Radius ---------- */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --radius-full: 999px;

  /* ---------- Shadows ---------- */
  --shadow-sm: 0 2px 8px rgba(11,13,18,0.06);
  --shadow-md: 0 8px 24px rgba(11,13,18,0.08);
  --shadow-lg: 0 16px 48px rgba(11,13,18,0.12);
  --shadow-blue: 0 12px 32px rgba(26,92,191,0.25);
  --shadow-red: 0 12px 32px rgba(205,46,54,0.22);

  /* ---------- Transitions ---------- */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.18s var(--ease);
  --transition: 0.3s var(--ease);
  --transition-slow: 0.5s var(--ease);

  /* ---------- Layout ---------- */
  --container-max: 1200px;
  --container-wide: 1400px;
  --header-height: 76px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

body {
  font-family: var(--font-primary);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

ul, ol { list-style: none; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

::selection {
  background: var(--color-blue-200, #cfe0f7);
  color: var(--color-blue-900);
}

/* ---------- Layout Containers ---------- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.container-wide {
  max-width: var(--container-wide);
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.section {
  padding: var(--space-12) 0;
}

@media (max-width: 768px) {
  .section { padding: var(--space-10) 0; }
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-10);
}

.section-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--primary-light);
  color: var(--primary-dark);
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 700;
  margin-bottom: var(--space-4);
}

.section-title {
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  color: var(--ink);
  margin-bottom: var(--space-3);
}

.section-description {
  color: var(--ink-muted);
  font-size: 1.05rem;
}

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.75rem;
  border-radius: var(--radius-full);
  font-weight: 700;
  font-size: 0.95rem;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: var(--gradient-blue);
  color: var(--color-white);
  box-shadow: var(--shadow-blue);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(26,92,191,0.32);
}
.btn-primary:disabled {
  background: var(--color-ink-200);
  color: var(--color-ink-400);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.btn-accent {
  background: var(--gradient-red);
  color: var(--color-white);
  box-shadow: var(--shadow-red);
}
.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(205,46,54,0.3);
}

.btn-outline {
  background: transparent;
  color: var(--primary-dark);
  border: 2px solid var(--color-blue-200, #cfe0f7);
}
.btn-outline:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

.btn-ghost {
  background: rgba(255,255,255,0.12);
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.25);
  backdrop-filter: blur(8px);
}
.btn-ghost:hover {
  background: rgba(255,255,255,0.2);
}

.btn-large {
  padding: 1.1rem 2.25rem;
  font-size: 1.05rem;
}

.btn-block { width: 100%; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}

/* ---------- Utility ---------- */
.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

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

/* Skip link for accessibility */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--primary);
  color: white;
  padding: var(--space-3) var(--space-5);
  z-index: 10000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus {
  left: 0;
}