/* ===== AVERA PALETTE (mirrors index.html) ===== */
:root {
  --black:#000000; --dark:#0a0a0a; --card:#111111; --card2:#171717;
  --border:#1e1e1e; --border2:#2a2a2a; --border3:#3a3a3a;
  --accent:#ffffff;            /* Avera uses white as its accent ("gold") */
  --silver:#888888; --white:#ffffff;
  --text:#666666; --text2:#999999; --body:#c4c4c4;
  --green:#4ade80; --red:#f87171;
  --font:'Montserrat', sans-serif;
}

/* ===== RESET & BASE ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
  font-family: var(--font);
  background: var(--black);
  color: var(--body);
  min-height: 100vh;
  letter-spacing: 0.01em;
}
h1, h2, h3, h4 { font-family: var(--font); letter-spacing: -0.01em; }
a { color: var(--white); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== LOGIN ===== */
.login-wrapper {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh;
  background:
    radial-gradient(ellipse 80% 60% at 50% 30%, rgba(255,255,255,0.03) 0%, transparent 60%),
    linear-gradient(180deg, #0f0f0f 0%, #000000 100%);
}
.login-box {
  background: var(--card);
  padding: 48px 40px;
  border: 1px solid var(--border);
  border-radius: 0;
  width: 400px; max-width: 100%;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
  text-align: center;
  position: relative; overflow: hidden;
}
.login-box::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(to right, var(--border3), var(--white), transparent);
}
.login-box h1 { font-size: 26px; margin-bottom: 8px; color: var(--white); letter-spacing: 0.18em; text-transform: uppercase; }
.login-box .subtitle { color: var(--text2); margin-bottom: 32px; font-size: 13px; letter-spacing: 0.12em; text-transform: uppercase; }
.login-box input {
  width: 100%; padding: 14px 16px; margin-bottom: 16px;
  border: 1px solid var(--border2); border-radius: 0;
  background: var(--card2); color: var(--white); font-size: 15px;
  font-family: var(--font); outline: none; transition: border-color .2s;
}
.login-box input:focus { border-color: var(--border3); }
.login-box button {
  width: 100%; padding: 14px; border: none; border-radius: 0;
  background: var(--white);
  color: var(--black); font-size: 13px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
  cursor: pointer; transition: opacity .2s; font-family: var(--font);
}
.login-box button:hover { opacity: .85; }
.login-box .error { color: var(--red); font-size: 13px; margin-bottom: 12px; }
.login-box .register-link { margin-top: 16px; font-size: 13px; color: var(--text); }
.login-box .register-link span { color: var(--white); cursor: pointer; }
.login-box .register-link span:hover { text-decoration: underline; }

/* ===== LAYOUT ===== */
.app-header {
  background: var(--dark);
  padding: 16px 32px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.app-header .header-left { display: flex; align-items: center; gap: 14px; min-width: 0; }
.course-hamburger {
  display: none; width: 36px; height: 36px; flex-shrink: 0;
  align-items: center; justify-content: center;
  background: transparent; border: 1px solid var(--border2); color: var(--text2);
  cursor: pointer; transition: color .2s;
}
.course-hamburger:hover { color: var(--white); }
.course-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,.6); z-index: 150; }
.app-header h2 { font-size: 18px; color: var(--white); letter-spacing: 0.16em; text-transform: uppercase; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.app-header .user-info { display: flex; align-items: center; gap: 12px; }
.app-header .user-info span { color: var(--text2); font-size: 14px; }
.app-header .logout-btn {
  padding: 8px 16px; border: 1px solid var(--border2); border-radius: 0;
  background: transparent; color: var(--text2); cursor: pointer; font-size: 12px;
  letter-spacing: 0.12em; text-transform: uppercase; font-family: var(--font);
  transition: all .2s;
}
.app-header .logout-btn:hover { border-color: var(--silver); color: var(--white); }

.dashboard {
  display: flex; min-height: calc(100vh - 60px);
}

/* ===== SIDEBAR ===== */
.sidebar {
  width: 280px; background: var(--dark); padding: 24px 0;
  border-right: 1px solid var(--border); flex-shrink: 0;
  overflow-y: auto;
}
.sidebar h3 {
  padding: 0 20px; font-size: 11px; text-transform: uppercase;
  letter-spacing: 0.22em; color: var(--text); margin-bottom: 12px;
}
.sidebar .nav-item {
  padding: 12px 20px; cursor: pointer;
  display: flex; align-items: center; gap: 10px;
  font-size: 13px; color: var(--text2); transition: all .2s;
  border-left: 2px solid transparent; letter-spacing: 0.04em;
}
.sidebar .nav-item:hover { background: rgba(255,255,255,.03); color: var(--white); }
.sidebar .nav-item.active {
  background: rgba(255,255,255,.05); color: var(--white);
  border-left-color: var(--white);
}
.sidebar .nav-item .status {
  margin-left: auto; font-size: 10px; padding: 2px 8px;
  border-radius: 0; background: var(--border2); color: var(--text2);
  letter-spacing: 0.08em; text-transform: uppercase;
}
.sidebar .nav-item .status.completed { background: rgba(74,222,128,.1); color: var(--green); border: 1px solid rgba(74,222,128,.2); }
.sidebar .nav-item .status.in-progress { background: rgba(255,255,255,.05); color: var(--white); border: 1px solid var(--border2); }
.sidebar .progress-bar {
  margin: 20px; height: 4px; background: var(--border2); border-radius: 0;
  overflow: hidden;
}
.sidebar .progress-bar .fill {
  height: 100%; background: linear-gradient(90deg, var(--silver), var(--white));
  border-radius: 0; transition: width .3s;
}
.sidebar .progress-text {
  padding: 0 20px; font-size: 12px; color: var(--text2); margin-bottom: 20px;
}

/* ===== MAIN CONTENT ===== */
.main-content {
  flex: 1; padding: 40px; overflow-y: auto; max-width: 900px;
}
.main-content h1 { font-size: 28px; color: var(--white); margin-bottom: 8px; }
.main-content .module-subtitle { color: var(--text2); margin-bottom: 32px; font-size: 15px; }
.content-section { margin-bottom: 36px; }
.content-section h2 {
  font-size: 20px; color: var(--white); margin-bottom: 16px;
  padding-bottom: 8px; border-bottom: 1px solid var(--border2);
}
.content-section h3 { font-size: 17px; color: var(--white); margin: 16px 0 8px; }
.content-section p { line-height: 1.8; color: var(--body); margin-bottom: 12px; font-weight: 300; }
.content-section ul, .content-section ol {
  padding-left: 24px; margin-bottom: 16px;
}
.content-section li { line-height: 1.8; color: var(--body); margin-bottom: 6px; font-weight: 300; }

.tip-box {
  background: var(--card2); border-left: 2px solid var(--green);
  padding: 16px 20px; border-radius: 0; margin: 16px 0;
}
.tip-box .tip-label { color: var(--green); font-weight: 600; font-size: 12px; margin-bottom: 4px; letter-spacing: 0.12em; text-transform: uppercase; }
.warning-box {
  background: var(--card2); border-left: 2px solid var(--red);
  padding: 16px 20px; border-radius: 0; margin: 16px 0;
}
.warning-box .warn-label { color: var(--red); font-weight: 600; font-size: 12px; margin-bottom: 4px; letter-spacing: 0.12em; text-transform: uppercase; }
.example-box {
  background: var(--card); border: 1px solid var(--border2);
  padding: 16px 20px; border-radius: 0; margin: 16px 0;
  font-family: 'Courier New', monospace; font-size: 14px;
  white-space: pre-wrap; color: var(--text2);
}
.example-box .label { font-family: var(--font); color: var(--text); font-size: 11px; margin-bottom: 8px; display: block; letter-spacing: 0.15em; text-transform: uppercase; }

/* ===== QUIZ ===== */
.quiz-container {
  background: var(--card); border: 1px solid var(--border); border-radius: 0; padding: 32px;
  margin-top: 24px;
}
.quiz-container h2 { color: var(--white); margin-bottom: 24px; font-size: 22px; }
.quiz-question {
  margin-bottom: 28px; padding-bottom: 20px;
  border-bottom: 1px solid var(--border2);
}
.quiz-question:last-of-type { border-bottom: none; }
.quiz-question p { color: var(--white); font-weight: 500; margin-bottom: 12px; }
.quiz-option {
  display: block; padding: 12px 16px; margin-bottom: 8px;
  border: 1px solid var(--border2); border-radius: 0;
  cursor: pointer; transition: all .2s; color: var(--text2);
  background: transparent; font-family: var(--font);
}
.quiz-option:hover { border-color: var(--silver); background: var(--card2); }
.quiz-option.selected { border-color: var(--white); background: var(--card2); color: var(--white); }
.quiz-option.correct { border-color: var(--green); background: rgba(74,222,128,.08); color: var(--green); }
.quiz-option.incorrect { border-color: var(--red); background: rgba(248,113,113,.08); color: var(--red); }
.quiz-submit {
  margin-top: 20px; padding: 14px 32px; border: none; border-radius: 0;
  background: var(--white);
  color: var(--black); font-size: 13px; font-weight: 700;
  letter-spacing: 0.18em; text-transform: uppercase;
  cursor: pointer; transition: opacity .2s; font-family: var(--font);
}
.quiz-submit:hover { opacity: .85; }
.quiz-submit:disabled { opacity: .4; cursor: not-allowed; }
.quiz-result {
  margin-top: 20px; padding: 20px; border-radius: 0;
  text-align: center; font-size: 18px; font-weight: 600;
}
.quiz-result.pass { background: rgba(74,222,128,.08); color: var(--green); border: 1px solid rgba(74,222,128,.2); }
.quiz-result.fail { background: rgba(248,113,113,.08); color: var(--red); border: 1px solid rgba(248,113,113,.2); }

/* ===== COMPLETE BTN ===== */
.complete-btn {
  margin-top: 32px; padding: 14px 28px; border: 1px solid var(--border2);
  border-radius: 0; background: transparent; color: var(--white);
  font-size: 13px; letter-spacing: 0.18em; text-transform: uppercase;
  cursor: pointer; transition: all .2s; font-family: var(--font); font-weight: 600;
}
.complete-btn:hover { border-color: var(--silver); background: var(--card2); }
.complete-btn.completed {
  background: var(--white); border-color: var(--white); color: var(--black);
  cursor: default;
}

/* ===== DASHBOARD HOME ===== */
.welcome-card {
  background: linear-gradient(135deg, var(--card2), var(--dark));
  border: 1px solid var(--border2); border-radius: 0;
  padding: 40px; margin-bottom: 32px;
  position: relative; overflow: hidden;
}
.welcome-card::before {
  content:''; position:absolute; top:0; left:0; right:0; height:2px;
  background: linear-gradient(to right, var(--border3), var(--white), transparent);
}
.welcome-card h1 { font-size: 32px; margin-bottom: 12px; color: var(--white); }
.welcome-card p { color: var(--text2); font-size: 16px; line-height: 1.7; font-weight: 300; }
.stats-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 1px; margin-bottom: 32px; background: var(--border);
  border: 1px solid var(--border);
}
.stat-card {
  background: var(--card); border-radius: 0; padding: 24px;
  text-align: center;
}
.stat-card .number { font-size: 36px; font-weight: 700; color: var(--white); font-family: var(--font); }
.stat-card .label { font-size: 12px; color: var(--text); margin-top: 4px; letter-spacing: 0.15em; text-transform: uppercase; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--border3); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .course-hamburger { display: flex; }
  /* Sidebar becomes a slide-in drawer instead of disappearing */
  .sidebar {
    position: fixed; top: 0; left: 0; height: 100vh; width: 270px; z-index: 200;
    transform: translateX(-100%); transition: transform .3s; display: block;
    border-right: 1px solid var(--border);
  }
  .sidebar.open { transform: translateX(0); }
  .course-overlay.show { display: block; }
  .app-header { padding: 14px 18px; }
  .app-header h2 { font-size: 15px; letter-spacing: 0.12em; }
  .app-header .logout-btn { padding: 7px 12px; font-size: 11px; }
  .main-content { padding: 22px 18px; }
  .stats-grid { grid-template-columns: 1fr; }
  .login-box { width: 100%; padding: 32px 22px; }
  .login-wrapper { padding: 1.2rem; }
}
@media (max-width: 420px) {
  .app-header .user-info span { display: none; }   /* save room for the name-less compact header */
  .main-content h1 { font-size: 23px; }
  .content-section h2 { font-size: 18px; }
  .quiz-container { padding: 22px 16px; }
}