/* ================================
   Base Design - Theme Variables
   ================================ */

/* Light Mode (Default) */
:root {
  --bg: #ffffff;
  --bg-soft: #f8f9fa;
  --card: rgba(255, 255, 255, 0.98);
  --text: #1a1f2e;
  --muted: #6c757d;
  --brand: #d7a94f;
  --brand-2: #2d7785;
  --danger: #dc3545;
  --ring: 0 0 0 3px rgba(215,169,79,0.35);
  --radius: 18px;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.08),
             inset 0 1px 0 rgba(255, 255, 255, 0.5);
  --nav-bg: rgba(255, 255, 255, 0.95);
  --nav-border: rgba(215, 169, 79, 0.2);
  --input-bg: rgba(215, 169, 79, 0.06);
  --border-color: rgba(0, 0, 0, 0.12);
  --bg-overlay: linear-gradient(180deg, rgba(255, 255, 255, 0.86) 0%, rgba(255, 255, 255, 0.88) 100%);
  --bg-overlay-opacity: 0.86;
  --bg-brightness: 1.4;
}

/* Dark Mode */
[data-theme="dark"] {
  --bg: #070b16;
  --bg-soft: #101730;
  --card: rgba(16, 23, 40, 0.86);
  --text: #f5f1e8;
  --muted: #c7c2b4;
  --brand: #d7a94f;
  --brand-2: #2d7785;
  --danger: #ff8b8b;
  --ring: 0 0 0 3px rgba(215,169,79,0.35);
  --radius: 18px;
  --shadow: 0 14px 36px rgba(0, 0, 0, 0.38),
             inset 0 1px 0 rgba(255, 255, 255, 0.04);
  --nav-bg: rgba(7, 11, 22, 0.78);
  --nav-border: rgba(215, 169, 79, 0.25);
  --input-bg: rgba(245, 225, 190, 0.08);
  --border-color: rgba(255, 255, 255, 0.08);
  --bg-overlay: linear-gradient(180deg, rgba(9, 14, 30, 0.66) 0%, rgba(9, 14, 30, 0.70) 100%);
  --bg-overlay-opacity: 0.66;
  --bg-brightness: 0.70;
}

* { box-sizing: border-box; }
html, body { height: 100%; }

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

.container {
  max-width: 1100px;
  margin-inline: auto;
  padding: 24px;
}

/* ================================
   Navbar
   ================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(140%) blur(10px);
  background: var(--nav-bg);
  border-bottom: 1px solid var(--nav-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  letter-spacing: .2px;
}
.logo {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: rgba(12,18,36,0.6);
  background-image: url('../img/logo_transparent.png');
  background-size: contain;
  background-position: center;
  background-repeat: no-repeat;
  box-shadow: var(--shadow);
}
.spacer { flex: 1; }
.nav a { opacity: .9; }
.nav a:hover { opacity: 1; }
.nav .btn {
  padding: .6rem 1rem;
  border-radius: 12px;
  background: linear-gradient(135deg, #3340a7, #5866f8);
  box-shadow: var(--shadow);
}

/* ================================
   Hero
   ================================ */
.hero {
  padding: 64px 24px 24px;
}
.hero .wrap {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 32px;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  color: var(--text);
  background: rgba(215,169,79,0.18);
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid rgba(215,169,79,0.32);
}
h1 {
  font-size: clamp(28px, 4vw, 46px);
  line-height: 1.1;
  margin: 14px 0 10px;
}
.lead {
  color: var(--text);
  font-size: 1.05rem;
  max-width: 60ch;
}
.cta {
  display: flex;
  gap: 12px;
  margin-top: 18px;
}
.secondary-cta {
  margin-top: 14px;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: .88rem 1.05rem;
  border-radius: 14px;
  font-weight: 600;
  border: 1px solid rgba(215,169,79,0.35);
  box-shadow: var(--shadow);
}
.btn.primary {
  background: linear-gradient(135deg, #d7b76a, #a76a20);
  color: #1a1f2e;
}
.btn.ghost {
  background: rgba(215,169,79,0.1);
  border-color: rgba(45,119,133,0.35);
}
.hero-card {
  background: var(--card);
  padding: 22px;
  border-radius: var(--radius);
  border: 1px solid var(--nav-border);
  box-shadow: var(--shadow);
}
.hero-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0,1fr));
  gap: 12px;
  margin-top: 10px;
}
.hero-list .chip {
  background: var(--input-bg);
  border: 1px solid var(--nav-border);
  padding: 10px 12px;
  border-radius: 12px;
  font-size: .95rem;
  color: var(--text);
}

/* ================================
   Sections
   ================================ */
section {
  padding: 36px 24px;
}
section h2 {
  font-size: clamp(22px, 3vw, 32px);
  margin: 0 0 6px;
}
section p.sub {
  margin: 0;
  color: var(--muted);
}

/* ================================
   Courses
   ================================ */
.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin: 16px 0 22px;
}
.filters input[type="search"],
.filters select {
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--nav-border);
  padding: .7rem .9rem;
  border-radius: 12px;
  outline: none;
}
.filters input[type="search"]:focus,
.filters select:focus {
  box-shadow: var(--ring);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 16px;
}
.card {
  grid-column: span 12;
  background: var(--card);
  border-radius: var(--radius);
  padding: 18px;
  border: 1px solid var(--nav-border);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.card header {
  display: flex;
  align-items: center;
  gap: 10px;
}
.badge {
  font-size: .78rem;
  letter-spacing: .2px;
  color: #0b0f1c;
  background: linear-gradient(135deg, rgba(215,169,79,0.95), rgba(45,119,133,0.95));
  padding: 6px 10px;
  border-radius: 999px;
  font-weight: 700;
}
.meta {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: .9rem;
}
.meta .dot {
  width: 6px;
  height: 6px;
  background: rgba(255,255,255,0.35);
  border-radius: 999px;
}
.card footer {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: auto;
}

@media (min-width: 640px) {
  .card { grid-column: span 6; }
}
@media (min-width: 980px) {
  .card { grid-column: span 4; }
}

/* ================================
   About / Hire / QnA Panels
   ================================ */
.panel {
  background: var(--card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.split {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 900px) {
  .split { grid-template-columns: 1fr 1fr; }
}
.panel label {
  display: block;
  font-size: .9rem;
  margin: .4rem 0 .2rem;
  color: var(--muted);
}
.panel input,
.panel textarea,
.panel select {
  width: 100%;
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border-color);
  padding: .75rem .85rem;
  border-radius: 12px;
}
.panel textarea {
  min-height: 130px;
  resize: vertical;
}

/* ================================
   Footer
   ================================ */
footer {
  padding: 32px 24px;
  color: var(--muted);
  border-top: 1px solid var(--border-color);
  margin-top: 24px;
}
.foot {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}
.foot .right { margin-left: auto; }

/* ================================
   Responsive Tweaks
   ================================ */

/* ================================
   Responsive Tweaks (fixed for mobile)
   ================================ */

/* Phones (≤640px) */
@media (max-width: 640px) {
  /* General */
  .container {
    padding: 16px;
  }

  /* NAV - Removed conflicting mobile styles (handled in responsive.css) */

  /* HERO */
  .hero {
    padding: 32px 16px;
  }
  .hero .wrap {
    grid-template-columns: 1fr; /* stack hero text + card */
    gap: 20px;
  }
  h1 {
    font-size: 1.6rem;
  }
  .lead {
    font-size: 0.95rem;
    max-width: 100%;
  }
  .cta {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
  }
  .hero-card {
    margin-top: 8px;
  }
  .hero-list {
    grid-template-columns: 1fr; /* stack chips */
  }

  /* COURSES */
  .grid {
    display: grid;
    grid-template-columns: 1fr; /* one card per row */
    gap: 16px;
  }
  .card {
    padding: 16px;
  }

  /* ABOUT / HIRE */
  .split {
    grid-template-columns: 1fr; /* stack panels */
  }

  /* FOOTER */
  .foot {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
  .foot .right {
    margin-left: 0;
  }
}

/* Tablets (641px–980px) */
@media (min-width: 641px) and (max-width: 980px) {
  .hero .wrap {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
  .hero-list {
    grid-template-columns: repeat(2, 1fr);
  }
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .split {
    grid-template-columns: 1fr 1fr;
  }
}

/* ================================
   Course Progress Badge
   ================================ */
.course-progress-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  background: linear-gradient(135deg, rgba(45, 119, 133, 0.15), rgba(45, 119, 133, 0.25));
  border: 1px solid var(--brand-2);
  border-radius: 12px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--brand-2);
  cursor: help;
  transition: all 0.2s ease;
}

.course-progress-badge:hover {
  background: linear-gradient(135deg, rgba(45, 119, 133, 0.25), rgba(45, 119, 133, 0.35));
  transform: translateY(-1px);
  box-shadow: 0 2px 8px rgba(45, 119, 133, 0.2);
}

.course-progress-badge svg {
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}