/* ==========================================================
   ? GameTraq Theme System 2025
   Elegant UI | Light + Dark Mode | Responsive Layout
   ========================================================== */

/* === BASE VARIABLES (Light Mode Default) === */
:root {
  --bg: #F6F7FA;
  --surface: #FFFFFF;
  --card: #FFFFFF;
  --border: #D8DEE9;
  --text: #1F2330;
  --muted: #4E5465;
  --accent: #3574F2;
  --accent-hover: #2659D3;
  --success: #10B981;
  --warning: #F59E0B;
  --error: #EF4444;
  --radius: 10px;
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --sidebar-bg: linear-gradient(180deg, #F0F2F6 0%, #E2E4E8 60%, #DCE0E4 100%);
  --sidebar-text: #1B1E28;
  --sidebar-hover: #D6DAE0;
}

/* === DARK MODE === */
:root[data-theme='dark'] {
  --bg: #0E1117;
  --surface: #161B22;
  --card: #1E2430;
  --border: #2E3440;
  --text: #EAECEF;
  --muted: #A5ACBA;
  --accent: #3B82F6;
  --accent-hover: #60A5FA;
  --sidebar-bg: linear-gradient(180deg, #1B1F27 0%, #141820 60%, #0F1217 100%);
  --sidebar-text: #EAECEF;
  --sidebar-hover: #2B3240;
  --shadow: 0 4px 16px rgba(0,0,0,0.3);
}

/* === GLOBAL RESET === */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Manrope', 'Inter', sans-serif;
  display: flex;
  min-height: 100vh;
  transition: background 0.3s ease, color 0.3s ease;
  overflow-x: hidden;
}

/* === LAYOUT === */
.layout {
  display: flex;
  width: 100%;
  min-height: 100vh;
}

/* === SIDEBAR === */
.sidebar {
  width: 250px;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  border-right: 1px solid var(--border);
  box-shadow: 2px 0 8px rgba(0,0,0,0.08);
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 1000;
}

.sidebar-header {
  padding: 1.2rem 1.5rem;
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--accent);
  border-bottom: 1px solid var(--border);
  text-shadow: 0 1px 0 rgba(255,255,255,0.4);
}

.nav-links {
  list-style: none;
  margin: 0;
  padding: 0.8rem;
  flex-grow: 1;
}

.nav-links li { margin: 0.3rem 0; }

.nav-links a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--sidebar-text);
  text-decoration: none;
  padding: 0.7rem 1rem;
  border-radius: var(--radius);
  font-weight: 500;
  position: relative;
  transition: background 0.25s ease, color 0.25s ease;
  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
}

.nav-links a:hover {
  background: var(--sidebar-hover);
  color: var(--accent-hover);
}

.nav-links a.active {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  box-shadow: inset 4px 0 0 var(--accent-hover);
  text-shadow: none;
}

/* === SIDEBAR FOOTER === */
.sidebar-footer {
  padding: 1rem;
  text-align: center;
  font-size: 0.85rem;
  color: #3A3E49;
  border-top: 1px solid var(--border);
  background: linear-gradient(180deg, #E5E8ED 0%, #DEE2E7 100%);
  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
}

:root[data-theme='dark'] .sidebar-footer {
  background: linear-gradient(180deg, #1A1E25 0%, #12151B 100%);
  color: #AAB3C3;
  border-top: 1px solid #2E3440;
}

/* === TOGGLE BUTTON (MOBILE) === */
.sidebar-toggle {
  display: none;
  position: fixed;
  top: 1rem;
  left: 1rem;
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  padding: 0.5rem 0.7rem;
  font-size: 1.2rem;
  z-index: 1100;
  cursor: pointer;
  box-shadow: var(--shadow);
}

/* === MAIN CONTENT === */
.main-content {
  flex-grow: 1;
  margin-left: 250px;
  padding: 2rem;
  transition: margin-left 0.3s ease;
}

/* === CARD === */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, border 0.2s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

/* === BUTTONS === */
.btn {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  padding: 0.7rem 1.3rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.25s ease, transform 0.2s ease;
}
.btn:hover { background: var(--accent-hover); transform: translateY(-2px); }

.btn-outline {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
}
.btn-outline:hover {
  background: var(--accent);
  color: #fff;
}

/* === GRID === */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

/* === FOOTER === */
.main-footer {
  text-align: center;
  padding: 1rem;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 2rem;
}

/* === THEME SWITCH BUTTON === */
.theme-toggle {
  margin-top: 1rem;
  display: inline-block;
  background: var(--accent);
  color: white;
  border-radius: var(--radius);
  border: none;
  padding: 0.5rem 1rem;
  cursor: pointer;
  transition: background 0.3s;
}
.theme-toggle:hover { background: var(--accent-hover); }

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .sidebar {
    width: 80%;
    max-width: 300px;
    left: -100%;
    transition: left 0.3s ease;
    background: var(--sidebar-bg);
  }
  .sidebar.active {
    left: 0;
    box-shadow: 4px 0 12px rgba(0,0,0,0.25);
  }
  .sidebar-toggle { display: block; }
  .main-content { margin-left: 0; padding: 1.2rem; }
}

/* === SESSION GRID === */
.session-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}
.session-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.4rem;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: all 0.25s ease;
}
.session-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 6px 16px rgba(0,0,0,0.12);
}
.session-card.active { border-top: 4px solid var(--accent); }
.session-card.ended  { opacity: 0.85; }

.session-header { display: flex; justify-content: space-between; align-items: flex-start; }
.session-header h3 { margin: 0; font-size: 1.1rem; font-weight: 600; }
.session-status.active { color: var(--success); }
.session-status.ended  { color: var(--error); }

.session-date { color: var(--muted); font-size: 0.85rem; margin: 0.4rem 0 1rem; }

.points-preview { font-size: 0.9rem; color: var(--muted); margin-top: 0.6rem; }
.points-preview strong { color: var(--accent); }

.session-footer { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }

.btn-outline.danger { border-color: var(--error); color: var(--error); }
.btn-outline.danger:hover { background: var(--error); color: #fff; }

/* === ADD TILE === */
.session-card.add-tile {
  background: repeating-linear-gradient(
    45deg,
    var(--surface),
    var(--surface) 10px,
    var(--border) 10px,
    var(--border) 11px
  );
  color: var(--muted);
  text-align: center;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease;
}
.session-card.add-tile:hover {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.session-card.add-tile span.plus {
  font-size: 3rem;
  display: block;
  margin-bottom: 0.5rem;
}

/* === AVATAR === */
.avatar {
  position: relative;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: var(--shadow);
}
.avatar-img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.avatar-fallback {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; background: var(--accent); color: #fff;
}

/* === TABLE ACTIONS === */
table td:last-child {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}
table td:last-child a.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.5rem;
  font-size: 0.9rem;
  border-radius: var(--radius);
}