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

:root {
  --primary:   #2E7D6B;
  --primary-l: #3A9E87;
  --primary-d: #1F5C4E;
  --accent:    #F0A500;
  --bg:        #F5F7F6;
  --surface:   #FFFFFF;
  --text:      #2B2B2B;
  --text-s:    #5C6B64;
  --border:    #D8E3DF;
  --error:     #C0392B;
  --radius:    12px;
  --shadow:    0 4px 24px rgba(0,0,0,0.08);
}

body {
  font-family: 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Noto Sans JP', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

/* ===========================
   Logo
=========================== */
.logo-mark {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.logo-name {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary-d);
  letter-spacing: 0.04em;
}

/* ===========================
   Login Page
=========================== */
.login-body {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #EAF3F0 0%, #F5F7F6 60%, #FDF6E8 100%);
}

.login-wrapper {
  width: 100%;
  max-width: 420px;
  padding: 24px 16px;
}

.login-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 48px 40px;
  text-align: center;
}

.login-logo {
  margin-bottom: 8px;
}

.login-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--primary-d);
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.login-desc {
  font-size: 0.875rem;
  color: var(--text-s);
  margin-bottom: 28px;
}

.error-msg {
  background: #FEF0EE;
  border: 1px solid #F1A89A;
  color: var(--error);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.875rem;
  margin-bottom: 20px;
}

.input-group {
  margin-bottom: 16px;
}

.password-input {
  width: 100%;
  padding: 14px 18px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  color: var(--text);
  background: var(--bg);
  outline: none;
  transition: border-color 0.2s;
  letter-spacing: 0.1em;
}
.password-input:focus {
  border-color: var(--primary);
  background: #fff;
}

.login-btn {
  width: 100%;
  padding: 14px;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: 0.06em;
  transition: background 0.2s, transform 0.1s;
}
.login-btn:hover  { background: var(--primary-l); }
.login-btn:active { transform: scale(0.98); }

.login-note {
  margin-top: 24px;
  font-size: 0.8rem;
  color: var(--text-s);
}

/* ===========================
   Videos Page — Header
=========================== */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-logo {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.header-subtitle {
  font-size: 0.85rem;
  color: var(--text-s);
  font-weight: 500;
  letter-spacing: 0.04em;
}

.logout-btn {
  font-size: 0.8rem;
  color: var(--text-s);
  text-decoration: none;
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 20px;
  transition: color 0.2s, border-color 0.2s;
}
.logout-btn:hover {
  color: var(--primary);
  border-color: var(--primary);
}

/* ===========================
   Videos Page — Main
=========================== */
.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.page-intro {
  text-align: center;
  margin-bottom: 48px;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--primary-d);
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.page-desc {
  font-size: 0.95rem;
  color: var(--text-s);
  line-height: 1.8;
}

/* ===========================
   Video Grid
=========================== */
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 32px;
}

.video-card {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s;
}
.video-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
}

.video-number {
  background: var(--primary);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  padding: 6px 14px;
  display: inline-block;
}

.video-embed {
  position: relative;
  padding-top: 56.25%; /* 16:9 */
  background: #000;
}
.video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
}

.video-info {
  padding: 18px 20px 22px;
}

.video-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--primary-d);
  margin-bottom: 6px;
  letter-spacing: 0.02em;
}

.video-subtitle {
  font-size: 0.85rem;
  color: var(--text-s);
}

/* ===========================
   Footer
=========================== */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 0.8rem;
  color: var(--text-s);
  border-top: 1px solid var(--border);
  background: var(--surface);
}

/* ===========================
   Responsive
=========================== */
@media (max-width: 600px) {
  .login-card {
    padding: 36px 24px;
  }
  .page-title {
    font-size: 1.4rem;
  }
  .video-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .header-inner {
    padding: 12px 16px;
  }
  .main-content {
    padding: 32px 16px 60px;
  }
}