/* ===== The Bash Guru - Saffron Terminal Theme ===== */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Fira+Code:wght@300;400;500;600&display=swap');

:root {
  --saffron: #f4a100;
  --saffron-bright: #ffb830;
  --saffron-dark: #c07d00;
  --saffron-muted: #8a5a00;
  --saffron-glow: rgba(244, 161, 0, 0.3);
  --bg-primary: #0a0a0a;
  --bg-secondary: #111111;
  --bg-card: #141414;
  --bg-terminal: #0d0d0d;
  --bg-hover: #1a1a1a;
  --text-primary: #e8e8e8;
  --text-secondary: #a0a0a0;
  --text-muted: #606060;
  --green: #39ff14;
  --green-dim: #1a7a05;
  --red: #ff4444;
  --cyan: #00d4d4;
  --border: #222222;
  --border-saffron: rgba(244, 161, 0, 0.4);
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;
}

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

html { scroll-behavior: smooth; }

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

/* Scanline effect */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0,0,0,0.03) 2px,
    rgba(0,0,0,0.03) 4px
  );
  pointer-events: none;
  z-index: 9999;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--saffron-dark); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--saffron); }

/* ===== Navbar ===== */
.navbar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-saffron);
  padding: 0 2rem;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(244, 161, 0, 0.1);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--saffron);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.nav-brand .prompt { color: var(--green); }
.nav-brand .brand-text { color: var(--saffron); }
.nav-brand .cursor {
  display: inline-block;
  width: 10px;
  height: 1.1em;
  background: var(--saffron);
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  transition: color 0.2s;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.nav-links a:hover, .nav-links a.active { color: var(--saffron); }
.nav-links .prompt-char { color: var(--saffron); }

.btn-nav {
  background: transparent;
  border: 1px solid var(--border-saffron);
  color: var(--saffron);
  padding: 0.3rem 1rem;
  border-radius: 3px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
  text-decoration: none;
}

.btn-nav:hover {
  background: var(--saffron);
  color: var(--bg-primary);
}

/* ===== Main Layout ===== */
.main-content { min-height: calc(100vh - 60px); }

.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }

/* ===== Terminal Window ===== */
.terminal-window {
  background: var(--bg-terminal);
  border: 1px solid var(--border-saffron);
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 0 30px rgba(244, 161, 0, 0.1);
}

.terminal-titlebar {
  background: var(--bg-secondary);
  padding: 0.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.terminal-dot {
  width: 12px; height: 12px;
  border-radius: 50%;
}
.dot-red { background: #ff5f57; }
.dot-yellow { background: var(--saffron); }
.dot-green { background: #28c840; }

.terminal-title {
  flex: 1;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.terminal-body { padding: 1.5rem; }

/* ===== Hero Section ===== */
.hero {
  padding: 5rem 0 4rem;
  text-align: center;
  position: relative;
}

.hero-tag {
  display: inline-block;
  background: var(--bg-card);
  border: 1px solid var(--border-saffron);
  color: var(--saffron);
  font-size: 0.75rem;
  padding: 0.3rem 1rem;
  border-radius: 20px;
  margin-bottom: 2rem;
  letter-spacing: 0.1em;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 700;
  margin-bottom: 1rem;
  line-height: 1.1;
}

.hero h1 .text-saffron { color: var(--saffron); text-shadow: 0 0 20px var(--saffron-glow); }
.hero h1 .text-green { color: var(--green); }

.hero p {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 600px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.hero-terminal {
  max-width: 700px;
  margin: 2rem auto;
  text-align: left;
}

.hero-btns {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2.5rem;
}

/* ===== Buttons ===== */
.btn-primary {
  background: var(--saffron);
  color: var(--bg-primary);
  border: none;
  padding: 0.7rem 1.8rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

.btn-primary:hover {
  background: var(--saffron-bright);
  box-shadow: 0 0 20px var(--saffron-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--saffron);
  border: 1px solid var(--border-saffron);
  padding: 0.7rem 1.8rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
  letter-spacing: 0.05em;
}

.btn-secondary:hover {
  background: var(--saffron-glow);
  border-color: var(--saffron);
}

.btn-green {
  background: var(--green-dim);
  color: var(--green);
  border: 1px solid var(--green);
  padding: 0.6rem 1.5rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s;
}

.btn-green:hover { background: rgba(57, 255, 20, 0.2); box-shadow: 0 0 15px rgba(57,255,20,0.3); }

/* ===== Stats Bar ===== */
.stats-bar {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 1.5rem 0;
  margin: 3rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  text-align: center;
}

.stat-item .stat-number {
  font-size: 2rem;
  font-weight: 700;
  color: var(--saffron);
}

.stat-item .stat-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

/* ===== Section Headers ===== */
.section-header {
  margin-bottom: 2.5rem;
}

.section-header .prompt-line {
  color: var(--saffron);
  font-size: 0.8rem;
  margin-bottom: 0.5rem;
}

.section-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-primary);
}

.section-header h2 span { color: var(--saffron); }
.section-header p { color: var(--text-secondary); margin-top: 0.5rem; font-size: 0.9rem; }

/* ===== Course Cards ===== */
.courses-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(340px, 100%), 1fr));
  gap: 1.5rem;
  padding: 2rem 0;
}

.course-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  overflow: hidden;
  transition: all 0.3s;
  text-decoration: none;
  display: block;
}

.course-card:hover {
  border-color: var(--saffron);
  box-shadow: 0 0 20px rgba(244, 161, 0, 0.15);
  transform: translateY(-2px);
}

.card-header {
  background: var(--bg-terminal);
  padding: 1rem 1.2rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-icon {
  font-size: 1.5rem;
  color: var(--saffron);
}

.card-level {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.2rem 0.6rem;
  border-radius: 3px;
}

.level-beginner { background: rgba(57,255,20,0.1); color: var(--green); border: 1px solid var(--green-dim); }
.level-intermediate { background: rgba(244,161,0,0.1); color: var(--saffron); border: 1px solid var(--saffron-muted); }
.level-advanced { background: rgba(255,68,68,0.1); color: var(--red); border: 1px solid rgba(255,68,68,0.4); }

.card-body { padding: 1.2rem; }
.card-body h3 { font-size: 1rem; font-weight: 600; color: var(--text-primary); margin-bottom: 0.5rem; }
.card-body p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.6; }

.card-meta {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  font-size: 0.75rem;
  color: var(--text-muted);
}

.card-meta span { display: flex; align-items: center; gap: 0.3rem; }

.progress-bar-wrap {
  background: var(--bg-secondary);
  height: 4px;
  border-radius: 2px;
  margin-top: 0.8rem;
  overflow: hidden;
}

.progress-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--saffron-dark), var(--saffron));
  border-radius: 2px;
  transition: width 0.5s ease;
}

.progress-text { font-size: 0.7rem; color: var(--saffron); margin-top: 0.3rem; }

/* ===== Terminal Code Block ===== */
.code-block {
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.2rem;
  font-size: 0.85rem;
  overflow-x: auto;
  position: relative;
}

.code-line { display: flex; align-items: flex-start; gap: 0.5rem; margin-bottom: 0.3rem; }
.code-prompt { color: var(--saffron); user-select: none; flex-shrink: 0; }
.code-cmd { color: var(--green); }
.code-comment { color: var(--text-muted); font-style: italic; }
.code-output { color: var(--text-secondary); margin-left: 1rem; }
.code-string { color: #f9e2af; }
.code-var { color: var(--cyan); }
.code-keyword { color: #cba6f7; }

pre.code-content {
  background: var(--bg-terminal);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1.5rem;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.7;
  color: #cdd6f4;
  position: relative;
}

pre.code-content .hl-comment { color: #6c7086; }
pre.code-content .hl-string { color: #a6e3a1; }
pre.code-content .hl-var { color: var(--cyan); }
pre.code-content .hl-keyword { color: #cba6f7; }
pre.code-content .hl-prompt { color: var(--saffron); }
pre.code-content .hl-output { color: #a6adc8; }

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-muted);
  padding: 0.2rem 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  border-radius: 3px;
  cursor: pointer;
  transition: all 0.2s;
}

.copy-btn:hover { border-color: var(--saffron); color: var(--saffron); }
.copy-btn.copied { color: var(--green); border-color: var(--green); }

/* ===== Lesson Sidebar ===== */
.lesson-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 0;
  min-height: calc(100vh - 60px);
}

.lesson-sidebar {
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  overflow-y: auto;
  position: sticky;
  top: 60px;
  height: calc(100vh - 60px);
}

.sidebar-header {
  padding: 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-terminal);
}

.sidebar-header h3 { font-size: 0.85rem; color: var(--saffron); }
.sidebar-progress { margin-top: 0.5rem; }

.lesson-list { padding: 0.5rem 0; }

.lesson-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem 1rem;
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.78rem;
  transition: all 0.15s;
  border-left: 3px solid transparent;
}

.lesson-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.lesson-item.active { background: var(--bg-hover); color: var(--saffron); border-left-color: var(--saffron); }
.lesson-item.completed { color: var(--green); }
.lesson-item.completed .lesson-check { color: var(--green); }

.lesson-check { font-size: 0.7rem; flex-shrink: 0; width: 16px; text-align: center; }
.lesson-num { color: var(--text-muted); font-size: 0.7rem; flex-shrink: 0; width: 22px; }

.section-title-sidebar {
  padding: 0.6rem 1rem 0.3rem;
  font-size: 0.7rem;
  color: var(--saffron-dark);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-top: 1px solid var(--border);
  margin-top: 0.3rem;
}

/* ===== Lesson Content ===== */
.lesson-main { padding: 2rem; overflow-y: auto; }

.lesson-header { margin-bottom: 2rem; padding-bottom: 1.5rem; border-bottom: 1px solid var(--border); }
.lesson-header .breadcrumb { font-size: 0.75rem; color: var(--text-muted); margin-bottom: 0.5rem; }
.lesson-header .breadcrumb a { color: var(--saffron); text-decoration: none; }
.lesson-header h1 { font-size: 1.6rem; font-weight: 700; }
.lesson-meta { display: flex; gap: 1rem; margin-top: 0.5rem; font-size: 0.75rem; color: var(--text-muted); }

.lesson-body { max-width: 800px; }

.lesson-body h2 { font-size: 1.2rem; color: var(--saffron); margin: 2rem 0 0.8rem; }
.lesson-body h3 { font-size: 1rem; color: var(--text-primary); margin: 1.5rem 0 0.5rem; }
.lesson-body p { color: var(--text-secondary); margin-bottom: 1rem; line-height: 1.8; font-size: 0.9rem; }
.lesson-body ul, .lesson-body ol { color: var(--text-secondary); padding-left: 1.5rem; margin-bottom: 1rem; font-size: 0.9rem; }
.lesson-body li { margin-bottom: 0.4rem; line-height: 1.7; }
.lesson-body code { background: var(--bg-card); color: var(--saffron); padding: 0.1em 0.4em; border-radius: 3px; font-size: 0.85em; }
.lesson-body strong { color: var(--text-primary); }

.lesson-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  gap: 1rem;
}

.complete-btn {
  background: var(--saffron);
  color: var(--bg-primary);
  border: none;
  padding: 0.7rem 2rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.complete-btn:hover { background: var(--saffron-bright); box-shadow: 0 0 20px var(--saffron-glow); }
.complete-btn.done { background: var(--green-dim); color: var(--green); border: 1px solid var(--green); }

/* ===== Forms ===== */
.auth-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 60px);
  padding: 2rem;
}

.auth-card {
  width: 100%;
  max-width: 420px;
}

.form-group { margin-bottom: 1.2rem; }

.form-label {
  display: block;
  font-size: 0.8rem;
  color: var(--saffron);
  margin-bottom: 0.4rem;
  letter-spacing: 0.05em;
}

.form-label .prompt-sign { color: var(--green); }

.form-input {
  width: 100%;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
  padding: 0.65rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  border-radius: 4px;
  transition: border-color 0.2s;
  outline: none;
}

.form-input:focus { border-color: var(--saffron); box-shadow: 0 0 8px var(--saffron-glow); }
.form-input::placeholder { color: var(--text-muted); }

.form-error {
  font-size: 0.75rem;
  color: var(--red);
  margin-top: 0.3rem;
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.form-submit {
  width: 100%;
  background: var(--saffron);
  color: var(--bg-primary);
  border: none;
  padding: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s;
  letter-spacing: 0.05em;
  margin-top: 0.5rem;
}

.form-submit:hover { background: var(--saffron-bright); box-shadow: 0 0 20px var(--saffron-glow); }

.auth-footer { text-align: center; margin-top: 1.5rem; font-size: 0.8rem; color: var(--text-muted); }
.auth-footer a { color: var(--saffron); text-decoration: none; }
.auth-footer a:hover { text-decoration: underline; }

/* ===== Messages ===== */
.messages-container { padding: 0.5rem 1.5rem; }
.message {
  padding: 0.6rem 1rem;
  border-radius: 4px;
  font-size: 0.85rem;
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.message-success { background: rgba(57,255,20,0.1); border: 1px solid var(--green-dim); color: var(--green); }
.message-error { background: rgba(255,68,68,0.1); border: 1px solid rgba(255,68,68,0.4); color: var(--red); }
.message-info { background: rgba(244,161,0,0.1); border: 1px solid var(--border-saffron); color: var(--saffron); }

/* ===== Dashboard ===== */
.dashboard-header {
  padding: 2.5rem 0 1.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
}

.dashboard-title { font-size: 1.4rem; font-weight: 700; }
.dashboard-title .prompt { color: var(--saffron); }
.dashboard-subtitle { color: var(--text-muted); font-size: 0.85rem; margin-top: 0.3rem; }

.dashboard-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.2rem;
  text-align: center;
  transition: border-color 0.2s;
}

.stat-card:hover { border-color: var(--border-saffron); }
.stat-card .stat-val { font-size: 2rem; font-weight: 700; color: var(--saffron); }
.stat-card .stat-lbl { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.1em; margin-top: 0.25rem; }

.enrollment-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.2rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s;
}

.enrollment-card:hover { border-color: var(--border-saffron); }

.enrollment-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.8rem;
}

.enrollment-top h3 { font-size: 1rem; font-weight: 600; }
.enrollment-top .progress-pct { color: var(--saffron); font-size: 0.85rem; font-weight: 600; }

.enrollment-meta { display: flex; gap: 1rem; font-size: 0.75rem; color: var(--text-muted); margin-top: 0.6rem; }

/* ===== Course Detail ===== */
.course-hero {
  padding: 3rem 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.course-detail-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: 2.5rem;
  padding-bottom: 3rem;
}

.course-sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border-saffron);
  border-radius: 6px;
  padding: 1.5rem;
  position: sticky;
  top: 80px;
}

.course-sidebar-card h3 { font-size: 0.85rem; color: var(--saffron); margin-bottom: 1rem; }

.lesson-index { list-style: none; }

.lesson-index-item {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.5rem;
  border-radius: 4px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all 0.15s;
  border: 1px solid transparent;
}

.lesson-index-item:hover { background: var(--bg-hover); color: var(--text-primary); border-color: var(--border); }
.lesson-index-item.done { color: var(--green); }
.lesson-index-item .li-num { color: var(--text-muted); font-size: 0.7rem; width: 20px; flex-shrink: 0; }
.lesson-index-item .li-check { color: var(--green); width: 16px; flex-shrink: 0; font-size: 0.75rem; }

.section-group { margin-bottom: 1rem; }
.section-group-title { font-size: 0.72rem; color: var(--saffron-dark); text-transform: uppercase; letter-spacing: 0.1em; padding: 0.3rem 0.5rem; }

/* ===== Features ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  text-align: center;
  transition: all 0.2s;
}

.feature-card:hover { border-color: var(--border-saffron); box-shadow: 0 0 15px rgba(244,161,0,0.08); }
.feature-icon { font-size: 2rem; margin-bottom: 0.8rem; }
.feature-card h3 { font-size: 0.95rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-primary); }
.feature-card p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== Footer ===== */
footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  margin-top: 4rem;
  text-align: center;
  font-size: 0.78rem;
  color: var(--text-muted);
}

footer .footer-brand { color: var(--saffron); font-weight: 600; }
footer .footer-links { display: flex; justify-content: center; gap: 1.5rem; margin-top: 0.5rem; }
footer .footer-links a { color: var(--text-muted); text-decoration: none; transition: color 0.2s; }
footer .footer-links a:hover { color: var(--saffron); }

/* ===== Animations ===== */
@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes typewriter {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in { animation: fadeIn 0.4s ease forwards; }

.typing-text {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--saffron);
  animation: typewriter 2s steps(40) 0.5s both, blink 0.7s step-end infinite;
}

/* ===== Hamburger Menu ===== */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: space-between;
  width: 28px;
  height: 20px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 200;
}

.nav-hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--saffron);
  border-radius: 2px;
  transition: all 0.3s;
  transform-origin: center;
}

.nav-hamburger.open span:nth-child(1) { transform: translateY(9px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-9px) rotate(-45deg); }

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

/* Tablet: 768px–1024px */
@media (max-width: 1024px) {
  .course-detail-layout { grid-template-columns: 1fr 280px; gap: 1.5rem; }
}

/* Tablet: up to 900px */
@media (max-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr; }
  .course-detail-layout { grid-template-columns: 1fr; }
  .course-sidebar-card { position: static; }

  .features-grid { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); }

  /* Lesson sidebar collapses into drawer on tablet/mobile */
  .lesson-sidebar {
    position: fixed;
    left: -100%;
    top: 60px;
    width: 300px;
    height: calc(100vh - 60px);
    z-index: 150;
    transition: left 0.3s ease;
    box-shadow: 4px 0 20px rgba(0,0,0,0.5);
  }

  .lesson-sidebar.open { left: 0; }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: 60px;
    background: rgba(0,0,0,0.6);
    z-index: 140;
  }

  .sidebar-overlay.visible { display: block; }

  .lesson-main { padding: 1.2rem; }

  .lesson-toggle-btn {
    display: inline-flex !important;
  }

  .lesson-nav {
    flex-wrap: wrap;
    gap: 0.6rem;
  }

  .lesson-nav > div {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    width: 100%;
    justify-content: flex-end;
  }

  .enroll-banner { flex-direction: column; align-items: flex-start; }
}

/* Mobile: up to 600px */
@media (max-width: 600px) {
  /* Navbar */
  .navbar { padding: 0 1rem; }

  .nav-hamburger { display: flex; }

  .nav-links {
    display: none;
    position: fixed;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-saffron);
    flex-direction: column;
    align-items: stretch;
    padding: 1rem;
    gap: 0.2rem;
    z-index: 120;
    box-shadow: 0 8px 30px rgba(0,0,0,0.5);
  }

  .nav-links.open { display: flex; }

  .nav-links li { width: 100%; }

  .nav-links a, .nav-links .btn-nav {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 0.9rem;
    border-radius: 4px;
    text-align: left;
    border: 1px solid transparent;
  }

  .nav-links a:hover { background: var(--bg-hover); border-color: var(--border); }

  .nav-links .btn-nav {
    border-color: var(--border-saffron);
    margin-top: 0.3rem;
    text-align: center;
  }

  /* Hero */
  .hero { padding: 2.5rem 0 2rem; }
  .hero h1 { font-size: 1.8rem; line-height: 1.2; }
  .hero p { font-size: 0.85rem; }
  .hero-tag { font-size: 0.65rem; letter-spacing: 0.05em; padding: 0.25rem 0.75rem; }
  .terminal-body { padding: 1rem; font-size: 0.8rem; }

  /* Buttons */
  .hero-btns { flex-direction: column; align-items: stretch; }
  .hero-btns .btn-primary,
  .hero-btns .btn-secondary { justify-content: center; width: 100%; }

  /* Stats */
  .stats-bar { padding: 1rem 0; margin: 1.5rem 0; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
  .stat-item .stat-number { font-size: 1.5rem; }

  /* Grids */
  .courses-grid {
    grid-template-columns: 1fr;
    padding: 1rem 0;
    gap: 1rem;
  }
  .features-grid { grid-template-columns: 1fr; gap: 1rem; }
  .dashboard-stats { grid-template-columns: repeat(2, 1fr); gap: 0.75rem; }

  /* Section header */
  .section-header { margin-bottom: 1.5rem; }
  .section-header h2 { font-size: 1.4rem; }

  /* Container */
  .container { padding: 0 1rem; }

  /* Dashboard */
  .dashboard-header { padding: 1.5rem 0 1rem; }
  .dashboard-title { font-size: 1rem; word-break: break-all; }
  .stat-card .stat-val { font-size: 1.5rem; }
  .enrollment-meta { flex-wrap: wrap; gap: 0.5rem; }
  .enrollment-top { flex-wrap: wrap; gap: 0.5rem; }

  /* Course detail */
  .course-hero { padding: 1.5rem 0; }
  .course-sidebar-card { position: static; }

  /* Lesson page */
  .lesson-main { padding: 1rem; }
  .lesson-header h1 { font-size: 1.2rem; }
  .lesson-body h2 { font-size: 1.05rem; }
  .lesson-body p, .lesson-body ul, .lesson-body ol { font-size: 0.85rem; }
  pre.code-content { font-size: 0.75rem; padding: 1rem; }
  .code-block { font-size: 0.78rem; padding: 0.8rem; }
  .lesson-nav { flex-direction: column; align-items: stretch; }
  .lesson-nav > div { justify-content: stretch; }
  .lesson-nav .btn-primary,
  .lesson-nav .btn-secondary,
  .complete-btn { width: 100%; justify-content: center; }
  .lesson-nav > :first-child { order: 3; }

  /* Auth forms */
  .auth-page { padding: 1rem; align-items: flex-start; padding-top: 2rem; }
  .terminal-body { padding: 1.2rem; }

  /* Footer */
  footer { padding: 1.5rem 0; }
  footer .footer-links { flex-wrap: wrap; gap: 1rem; }

  /* Callouts */
  .callout { font-size: 0.82rem; padding: 0.8rem 1rem; }
}

/* ===== Enroll Banner ===== */
.enroll-banner {
  background: linear-gradient(135deg, rgba(244,161,0,0.1), rgba(244,161,0,0.05));
  border: 1px solid var(--border-saffron);
  border-radius: 6px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.enroll-text h3 { font-size: 1rem; font-weight: 600; margin-bottom: 0.3rem; }
.enroll-text p { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== Empty state ===== */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state .empty-icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: 0.5rem; }
.empty-state p { font-size: 0.85rem; margin-bottom: 1.5rem; }

/* ===== Callout boxes ===== */
.callout {
  border-radius: 4px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
  font-size: 0.88rem;
  border-left: 3px solid;
}

.callout-info { background: rgba(0,212,212,0.07); border-color: var(--cyan); color: var(--text-secondary); }
.callout-warning { background: rgba(244,161,0,0.07); border-color: var(--saffron); color: var(--text-secondary); }
.callout-tip { background: rgba(57,255,20,0.07); border-color: var(--green); color: var(--text-secondary); }
.callout strong { color: var(--text-primary); }