/* =====================================================
   Curves 社交工程教育平台 — 全域共用樣式
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;600;700;900&family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ─── Design Tokens ─────────────────────────────── */
:root {
  --bg-primary:     #0a0f1e;
  --bg-secondary:   #0d1530;
  --bg-card:        rgba(255, 255, 255, 0.04);
  --bg-card-hover:  rgba(255, 255, 255, 0.08);
  --border-color:   rgba(0, 212, 255, 0.15);
  --border-hover:   rgba(0, 212, 255, 0.4);

  --blue:           #00d4ff;
  --blue-dark:      #0099cc;
  --blue-glow:      rgba(0, 212, 255, 0.25);
  --orange:         #ff6b35;
  --orange-glow:    rgba(255, 107, 53, 0.25);
  --green:          #00ff88;
  --green-glow:     rgba(0, 255, 136, 0.2);
  --red:            #ff3366;
  --red-glow:       rgba(255, 51, 102, 0.25);
  --purple:         #a855f7;
  --yellow:         #fbbf24;

  --text-primary:   #e8f4fd;
  --text-secondary: rgba(232, 244, 253, 0.6);
  --text-dim:       rgba(232, 244, 253, 0.35);

  --font-main:      'Noto Sans TC', 'Inter', sans-serif;
  --radius-sm:      8px;
  --radius-md:      14px;
  --radius-lg:      20px;
  --radius-xl:      28px;

  --transition:     all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card:    0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-glow:    0 0 30px var(--blue-glow);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
}

/* Animated background grid */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 212, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 212, 255, 0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  pointer-events: none;
  z-index: 0;
}

body::after {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 20% 20%, rgba(0, 212, 255, 0.06) 0%, transparent 50%),
              radial-gradient(ellipse at 80% 80%, rgba(168, 85, 247, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
  animation: bgPulse 8s ease-in-out infinite alternate;
}

@keyframes bgPulse {
  0%   { opacity: 0.5; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}

/* ─── Navbar ────────────────────────────────────── */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background: rgba(10, 15, 30, 0.85);
  border-bottom: 1px solid var(--border-color);
  padding: 0 2rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-logo {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--blue), var(--purple));
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.navbar-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.navbar-title span {
  color: var(--blue);
}

.navbar-nav {
  display: flex;
  gap: 0.25rem;
}

.nav-link {
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
  color: var(--blue);
  background: rgba(0, 212, 255, 0.1);
}

@media (max-width: 640px) {
  .navbar {
    padding: 0 1rem;
    height: 56px;
  }
  .navbar-title {
    display: none;
  }
  .navbar-nav {
    gap: 0.1rem;
  }
  .nav-link {
    padding: 0.35rem 0.55rem;
    font-size: 0.78rem;
  }
  .mobile-hide {
    display: none;
  }
}

/* ─── Page Layout ───────────────────────────────── */
.page-container {
  position: relative;
  z-index: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 2rem;
}

.page-header {
  margin-bottom: 2.5rem;
}

.page-title {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin-bottom: 0.5rem;
}

.page-title .accent { color: var(--blue); }
.page-title .orange { color: var(--orange); }
.page-title .green  { color: var(--green);  }

.page-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* ─── Glass Cards ───────────────────────────────── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: var(--shadow-card);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}

.card:hover { border-color: var(--border-hover); transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), var(--shadow-glow); }
.card:hover::before { opacity: 1; }

/* ─── Stat Cards ─────────────────────────────────── */
.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  backdrop-filter: blur(10px);
  transition: var(--transition);
}
.stat-card:hover { border-color: var(--border-hover); }
.stat-value {
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.stat-label { font-size: 0.8rem; color: var(--text-secondary); font-weight: 500; text-transform: uppercase; letter-spacing: 0.06em; }

/* ─── Buttons ───────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0.6rem 1.4rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  font-family: var(--font-main);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-dark));
  color: var(--bg-primary);
  box-shadow: 0 4px 15px var(--blue-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 25px var(--blue-glow); }

.btn-danger {
  background: linear-gradient(135deg, var(--red), #cc2255);
  color: #fff;
  box-shadow: 0 4px 15px var(--red-glow);
}
.btn-danger:hover { transform: translateY(-2px); }

.btn-success {
  background: linear-gradient(135deg, var(--green), #00cc66);
  color: var(--bg-primary);
  box-shadow: 0 4px 15px var(--green-glow);
}
.btn-success:hover { transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--border-hover);
  color: var(--text-primary);
}
.btn-outline:hover { background: var(--bg-card-hover); border-color: var(--blue); color: var(--blue); }

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
}
.btn-ghost:hover { background: var(--bg-card); color: var(--text-primary); }

.btn-lg { padding: 0.85rem 2rem; font-size: 1rem; border-radius: var(--radius-md); }
.btn-sm { padding: 0.4rem 0.9rem; font-size: 0.8rem; }

/* ─── Badges ─────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 10px;
  border-radius: 50px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}
.badge-blue    { background: rgba(0, 212, 255, 0.15); color: var(--blue); border: 1px solid rgba(0, 212, 255, 0.3); }
.badge-orange  { background: rgba(255, 107, 53, 0.15); color: var(--orange); border: 1px solid rgba(255, 107, 53, 0.3); }
.badge-green   { background: rgba(0, 255, 136, 0.12); color: var(--green); border: 1px solid rgba(0, 255, 136, 0.25); }
.badge-red     { background: rgba(255, 51, 102, 0.15); color: var(--red); border: 1px solid rgba(255, 51, 102, 0.3); }
.badge-purple  { background: rgba(168, 85, 247, 0.15); color: var(--purple); border: 1px solid rgba(168, 85, 247, 0.3); }
.badge-yellow  { background: rgba(251, 191, 36, 0.15); color: var(--yellow); border: 1px solid rgba(251, 191, 36, 0.3); }

/* ─── Progress Bars ─────────────────────────────── */
.progress-bar-wrap { background: rgba(255,255,255,0.06); border-radius: 50px; overflow: hidden; height: 8px; }
.progress-bar-fill {
  height: 100%;
  border-radius: 50px;
  background: linear-gradient(90deg, var(--blue), var(--purple));
  transition: width 1s cubic-bezier(0.4, 0, 0.2, 1);
  box-shadow: 0 0 10px var(--blue-glow);
}

/* ─── Forms ─────────────────────────────────────── */
.form-group { margin-bottom: 1.25rem; }
.form-label { display: block; font-size: 0.83rem; font-weight: 600; color: var(--text-secondary); margin-bottom: 0.45rem; letter-spacing: 0.04em; text-transform: uppercase; }
.form-control {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.7rem 1rem;
  color: var(--text-primary);
  font-family: var(--font-main);
  font-size: 0.9rem;
  transition: var(--transition);
  outline: none;
}
.form-control:focus { border-color: var(--blue); box-shadow: 0 0 0 3px var(--blue-glow); background: rgba(0, 212, 255, 0.03); }
.form-control::placeholder { color: var(--text-dim); }
select.form-control option { background: var(--bg-secondary); color: var(--text-primary); }

/* ─── Tables ─────────────────────────────────────── */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); border: 1px solid var(--border-color); }
table { width: 100%; border-collapse: collapse; }
th {
  background: rgba(0, 212, 255, 0.06);
  padding: 0.85rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--blue);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-color);
}
td {
  padding: 0.85rem 1rem;
  font-size: 0.88rem;
  border-bottom: 1px solid rgba(255,255,255,0.04);
  color: var(--text-primary);
}
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(0, 212, 255, 0.03); }

/* ─── Modals ─────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.modal-overlay.active { opacity: 1; pointer-events: all; }
.modal {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  max-width: 520px;
  width: 90%;
  transform: translateY(20px) scale(0.97);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.modal-overlay.active .modal { transform: translateY(0) scale(1); }
.modal-title { font-size: 1.2rem; font-weight: 700; margin-bottom: 1.5rem; }
.modal-actions { display: flex; gap: 0.75rem; justify-content: flex-end; margin-top: 1.5rem; }

/* ─── Alerts ─────────────────────────────────────── */
.alert {
  padding: 1rem 1.25rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.alert-warning { background: rgba(255,107,53,0.1); border: 1px solid rgba(255,107,53,0.3); color: var(--orange); }
.alert-info    { background: rgba(0,212,255,0.08); border: 1px solid rgba(0,212,255,0.25); color: var(--blue); }
.alert-success { background: rgba(0,255,136,0.08); border: 1px solid rgba(0,255,136,0.2); color: var(--green); }

/* ─── Grid Layouts ──────────────────────────────── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }

@media (max-width: 1100px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px)  { .grid-3, .grid-2 { grid-template-columns: 1fr; } .grid-4 { grid-template-columns: 1fr; } }

/* ─── Dividers ──────────────────────────────────── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border-color), transparent);
  margin: 1.5rem 0;
}

/* ─── Utility Classes ───────────────────────────── */
.text-blue   { color: var(--blue); }
.text-orange { color: var(--orange); }
.text-green  { color: var(--green); }
.text-red    { color: var(--red); }
.text-dim    { color: var(--text-secondary); }
.text-center { text-align: center; }
.fw-700 { font-weight: 700; }
.fw-800 { font-weight: 800; }
.mb-1  { margin-bottom: 0.5rem; }
.mb-2  { margin-bottom: 1rem; }
.mb-3  { margin-bottom: 1.5rem; }
.mb-4  { margin-bottom: 2rem; }
.mt-1  { margin-top: 0.5rem; }
.mt-2  { margin-top: 1rem; }
.mt-auto { margin-top: auto; }
.flex  { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }
.w-full { width: 100%; }
.hidden { display: none; }

/* ─── Animations ─────────────────────────────────── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.5; }
}
@keyframes spin {
  to { transform: rotate(360deg); }
}
@keyframes glow {
  0%, 100% { box-shadow: 0 0 10px var(--blue-glow); }
  50%       { box-shadow: 0 0 30px var(--blue-glow), 0 0 60px var(--blue-glow); }
}
@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-20px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  20%       { transform: translateX(-8px); }
  40%       { transform: translateX(8px); }
  60%       { transform: translateX(-5px); }
  80%       { transform: translateX(5px); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-10px); }
}

.animate-in { animation: fadeInUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) both; }
.animate-delay-1 { animation-delay: 0.1s; }
.animate-delay-2 { animation-delay: 0.2s; }
.animate-delay-3 { animation-delay: 0.3s; }
.animate-delay-4 { animation-delay: 0.4s; }

/* ─── Scrollbar ─────────────────────────────────── */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: rgba(0, 212, 255, 0.3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0, 212, 255, 0.5); }

/* ─── Loading Spinner ───────────────────────────── */
.spinner { width: 24px; height: 24px; border: 2px solid rgba(0,212,255,0.2); border-top-color: var(--blue); border-radius: 50%; animation: spin 0.8s linear infinite; }

/* ─── Toast Notifications ───────────────────────── */
#toast-container {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.toast {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.85rem 1.25rem;
  font-size: 0.88rem;
  max-width: 320px;
  animation: slideInLeft 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.toast.success { border-color: rgba(0,255,136,0.3); }
.toast.error   { border-color: rgba(255,51,102,0.3); }