/* =====================================================
   平森塾9期 会員サイト - Design System
   公式サイト CSS変数を流用
   ===================================================== */

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

:root {
  --color-ink: #1a1a1a;
  --color-ink-light: #2d2d2d;
  --color-gold: #c4a35a;
  --color-gold-light: #d4b86a;
  --color-gold-dark: #a08348;
  --color-washi: #faf8f5;
  --color-washi-dark: #f0ebe3;
  --color-stone: #6b7280;
  --color-stone-light: #9ca3af;
  --color-teal: #0d7377;
  --color-teal-light: #14919b;
  --color-white: #ffffff;
  --color-cream: #f5f0e8;

  --font-display: 'Cormorant Garamond', 'Noto Serif JP', serif;
  --font-body: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-accent: 'Noto Serif JP', serif;

  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 2rem;
  --space-lg: 4rem;
  --space-xl: 6rem;

  --max-width: 1000px;
  --max-width-narrow: 640px;

  --transition-fast: 0.2s ease;
  --transition-medium: 0.4s ease;

  --shadow-subtle: 0 2px 20px rgba(26, 26, 26, 0.06);
  --shadow-medium: 0 8px 40px rgba(26, 26, 26, 0.1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.8;
  color: var(--color-ink);
  background-color: var(--color-washi);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

::selection {
  background-color: var(--color-gold);
  color: var(--color-white);
}

a { color: var(--color-teal); text-decoration: none; }
a:hover { text-decoration: underline; }

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

/* =====================================================
   Layout
   ===================================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

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

/* =====================================================
   Header
   ===================================================== */
.site-header {
  background: var(--color-ink);
  color: var(--color-white);
  padding: var(--space-sm) 0;
}

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

.site-logo {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--color-white);
  text-decoration: none;
  letter-spacing: 0.05em;
}

.site-logo:hover { text-decoration: none; }

.site-logo span { color: var(--color-gold); }

.site-logo-sub {
  font-size: 0.7rem;
  color: rgba(255,255,255,0.6);
  display: block;
  letter-spacing: 0.1em;
}

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

.header-nav a {
  color: rgba(255,255,255,0.7);
  font-size: 0.85rem;
  text-decoration: none;
  transition: color var(--transition-fast);
}

.header-nav a:hover {
  color: var(--color-gold);
  text-decoration: none;
}

/* =====================================================
   Login Page
   ===================================================== */
.login-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: var(--space-md);
}

.login-card {
  background: var(--color-white);
  border-radius: 4px;
  box-shadow: var(--shadow-medium);
  padding: var(--space-lg);
  width: 100%;
  max-width: 400px;
  text-align: center;
}

.login-logo {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  letter-spacing: 0.05em;
}

.login-logo span { color: var(--color-gold); }

.login-subtitle {
  font-size: 0.85rem;
  color: var(--color-stone);
  margin-bottom: var(--space-md);
}

.login-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: var(--space-md);
}

.login-input {
  width: 100%;
  padding: 0.875rem 1rem;
  border: 2px solid var(--color-washi-dark);
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 1rem;
  background: var(--color-washi);
  transition: border-color var(--transition-fast);
  outline: none;
  margin-bottom: var(--space-sm);
}

.login-input:focus {
  border-color: var(--color-gold);
}

.login-input::placeholder {
  color: var(--color-stone-light);
}

.login-btn {
  width: 100%;
  padding: 0.875rem;
  background: var(--color-ink);
  color: var(--color-white);
  border: none;
  border-radius: 4px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.login-btn:hover {
  background: var(--color-gold);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(196, 163, 90, 0.3);
}

.login-error {
  color: #dc2626;
  font-size: 0.85rem;
  margin-top: var(--space-xs);
  display: none;
}

.login-error.show {
  display: block;
}

/* =====================================================
   Page Layout (authenticated pages)
   ===================================================== */
.page-body {
  padding: var(--space-lg) 0;
}

.page-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 500;
  margin-bottom: var(--space-xs);
  line-height: 1.3;
}

.page-subtitle {
  color: var(--color-stone);
  font-size: 0.95rem;
  margin-bottom: var(--space-lg);
}

/* =====================================================
   Dashboard Cards
   ===================================================== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-md);
}

.card {
  background: var(--color-white);
  border-radius: 4px;
  box-shadow: var(--shadow-subtle);
  padding: var(--space-md);
  transition: all var(--transition-medium);
  position: relative;
  overflow: hidden;
  text-decoration: none;
  color: var(--color-ink);
  display: block;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-medium);
  text-decoration: none;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--color-gold);
  transform: scaleX(0);
  transition: transform var(--transition-medium);
}

.card:hover::before {
  transform: scaleX(1);
}

.card-number {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 300;
  color: var(--color-washi-dark);
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  line-height: 1;
}

.card-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  text-transform: uppercase;
  margin-bottom: var(--space-xs);
}

.card-title {
  font-family: var(--font-accent);
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.card-desc {
  font-size: 0.9rem;
  color: var(--color-stone);
  margin-bottom: var(--space-sm);
}

.card-link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-ink);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.card-link .arrow {
  transition: transform var(--transition-fast);
}

.card:hover .card-link .arrow {
  transform: translateX(4px);
}

.card-status {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  margin-bottom: var(--space-sm);
}

.card-status.active {
  background: #ecfdf5;
  color: #059669;
}

.card-status.upcoming {
  background: var(--color-cream);
  color: var(--color-gold-dark);
}

/* =====================================================
   Content Section (pre-learning, lectures)
   ===================================================== */
.content-section {
  background: var(--color-white);
  border-radius: 4px;
  box-shadow: var(--shadow-subtle);
  padding: var(--space-md);
  margin-bottom: var(--space-md);
}

.content-section-title {
  font-family: var(--font-accent);
  font-size: 1.1rem;
  font-weight: 500;
  margin-bottom: var(--space-sm);
  padding-bottom: var(--space-xs);
  border-bottom: 1px solid var(--color-washi-dark);
}

.video-wrapper {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  border-radius: 4px;
  margin-bottom: var(--space-md);
  background: var(--color-ink);
}

.video-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.task-box {
  background: var(--color-cream);
  border-radius: 4px;
  padding: var(--space-md);
  border-left: 4px solid var(--color-gold);
}

.task-box-title {
  font-weight: 500;
  margin-bottom: var(--space-xs);
  font-size: 1rem;
}

.task-box p {
  font-size: 0.9rem;
  color: var(--color-ink-light);
  margin-bottom: var(--space-xs);
}

.task-box p:last-child {
  margin-bottom: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  transition: all var(--transition-fast);
}

.btn:hover { text-decoration: none; }

.btn-primary {
  background: var(--color-ink);
  color: var(--color-white);
}

.btn-primary:hover {
  background: var(--color-gold);
  transform: translateY(-2px);
}

.btn-gold {
  background: var(--color-gold);
  color: var(--color-white);
}

.btn-gold:hover {
  background: var(--color-gold-dark);
}

/* Breadcrumb */
.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-stone);
  margin-bottom: var(--space-md);
}

.breadcrumb a {
  color: var(--color-stone);
}

.breadcrumb a:hover {
  color: var(--color-gold);
}

/* Lecture list */
.lecture-list {
  list-style: none;
}

.lecture-item {
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-washi-dark);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.lecture-item:last-child {
  border-bottom: none;
}

.lecture-month {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 600;
  color: var(--color-teal);
  min-width: 3rem;
}

.lecture-info {
  flex: 1;
}

.lecture-title {
  font-weight: 500;
  font-size: 0.95rem;
}

.lecture-date {
  font-size: 0.8rem;
  color: var(--color-stone);
}

.lecture-status {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  font-weight: 500;
}

.lecture-status.available {
  background: #ecfdf5;
  color: #059669;
}

.lecture-status.locked {
  background: var(--color-washi-dark);
  color: var(--color-stone);
}

/* =====================================================
   Footer
   ===================================================== */
.site-footer {
  background: var(--color-ink);
  color: rgba(255,255,255,0.6);
  text-align: center;
  padding: var(--space-md) 0;
  font-size: 0.8rem;
  margin-top: auto;
}

/* =====================================================
   Responsive
   ===================================================== */
@media (max-width: 768px) {
  :root {
    --space-lg: 2.5rem;
    --space-xl: 3.5rem;
  }

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

  .site-header .container {
    flex-direction: column;
    gap: 0.5rem;
  }

  .header-nav {
    gap: var(--space-xs);
  }
}

@media (max-width: 480px) {
  .login-card {
    padding: var(--space-md);
  }
}