/* =====================================================
   AI Certificate in 28 Days
   Course-specific stylesheet; extends /style.css
   ===================================================== */

:root {
  --ai-purple: #6B46C1;
  --ai-purple-dark: #4C3190;
  --ai-purple-light: #9061F9;
  --ai-purple-bg: #F3EEFF;
  --day-card-shadow: 0 4px 14px rgba(107, 70, 193, 0.10);
}

/* ---- Hero ----------------------------------------- */

.ai-hero {
  background: linear-gradient(135deg, #1A1A3A 0%, #3D2580 45%, #6B46C1 100%);
  color: white;
  padding: 4rem 1.5rem 3.5rem;
  border-radius: var(--radius-lg);
  margin-bottom: 2rem;
  position: relative;
  overflow: hidden;
}
.ai-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(155, 120, 255, 0.35) 0%, transparent 35%),
    radial-gradient(circle at 80% 70%, rgba(255, 120, 200, 0.25) 0%, transparent 40%);
  pointer-events: none;
}
.ai-hero > * { position: relative; z-index: 1; }
.ai-hero h1 {
  color: white;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  margin-bottom: 0.75rem;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.ai-hero .subtitle {
  font-size: 1.1rem;
  opacity: 0.9;
  margin-bottom: 1.4rem;
  font-weight: 300;
}
.ai-hero .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 2rem;
  margin: 1.8rem 0 1.2rem;
}
.ai-hero .meta-item .meta-num {
  font-size: 2rem;
  font-weight: 700;
  display: block;
  line-height: 1.1;
}
.ai-hero .meta-item .meta-label {
  font-size: 0.85rem;
  opacity: 0.8;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* ---- Audience callout ----------------------------- */

.audience-callout {
  background: var(--ai-purple-bg);
  border-left: 4px solid var(--ai-purple);
  border-radius: var(--radius-md);
  padding: 1.2rem 1.4rem;
  margin: 2rem 0;
}
.audience-callout strong { color: var(--ai-purple-dark); }

/* ---- Progress summary ----------------------------- */

.progress-summary {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.5rem;
  margin: 2rem 0;
  box-shadow: var(--shadow-sm);
}
.progress-summary h3 {
  margin: 0 0 0.8rem;
  font-size: 1.15rem;
  color: var(--primary-dark);
}
.progress-bar-outer {
  height: 10px;
  background: #EEE6FB;
  border-radius: 999px;
  overflow: hidden;
  margin: 0.8rem 0;
}
.progress-bar-inner {
  height: 100%;
  background: linear-gradient(90deg, var(--ai-purple-light), var(--ai-purple));
  border-radius: 999px;
  transition: width 0.4s ease-out;
  width: 0%;
}
.progress-stats {
  display: flex;
  justify-content: space-between;
  font-size: 0.92rem;
  color: var(--text-secondary);
}

/* ---- 28-day grid --------------------------------- */

.weeks {
  margin: 2rem 0;
}
.week-section {
  margin-bottom: 2rem;
}
.week-header {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  margin-bottom: 1rem;
  padding-bottom: 0.6rem;
  border-bottom: 2px solid var(--ai-purple);
}
.week-number {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ai-purple);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}
.week-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--primary-dark);
}

.day-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.9rem;
}
.day-card {
  background: white;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  transition: transform 0.15s, box-shadow 0.15s;
  position: relative;
  color: var(--text-primary);
  text-decoration: none;
}
.day-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--day-card-shadow);
  border-color: var(--ai-purple-light);
  text-decoration: none;
}
.day-card.done {
  background: var(--ai-purple-bg);
  border-color: var(--ai-purple-light);
}
.day-card .day-num {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--ai-purple);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.day-card .day-tool {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--primary-dark);
  line-height: 1.25;
}
.day-card .day-focus {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.35;
}
.day-card .day-check {
  position: absolute;
  top: 0.75rem;
  right: 0.85rem;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--border-color);
  background: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 700;
}
.day-card.done .day-check {
  background: var(--ai-purple);
  border-color: var(--ai-purple);
  color: white;
}
.day-card.done .day-check::after { content: ""; }

/* ---- Day page ------------------------------------- */

.day-page {
  max-width: 780px;
  margin: 0 auto;
}
.day-breadcrumb {
  font-size: 0.85rem;
  color: var(--text-light);
  margin: 1rem 0 0.8rem;
}
.day-breadcrumb a { color: var(--ai-purple); }

.day-hero {
  background: linear-gradient(135deg, var(--ai-purple-dark), var(--ai-purple));
  color: white;
  padding: 2.2rem 1.8rem 2rem;
  border-radius: var(--radius-lg);
  margin-bottom: 1.8rem;
}
.day-hero .day-label {
  font-size: 0.8rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0.85;
  margin-bottom: 0.4rem;
}
.day-hero h1 {
  color: white;
  font-size: 2.2rem;
  line-height: 1.1;
  margin-bottom: 0.4rem;
}
.day-hero .day-tagline {
  font-size: 1.05rem;
  opacity: 0.92;
}
.day-hero .day-duration {
  display: inline-block;
  margin-top: 1rem;
  background: rgba(255, 255, 255, 0.18);
  border: 1px solid rgba(255, 255, 255, 0.3);
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
}

/* ---- Day sections (the 4-part template) ----------- */

.day-section {
  margin: 2rem 0;
}
.day-section h2 {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.3rem;
  color: var(--primary-dark);
  margin-bottom: 0.8rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border-color);
}
.day-section h2 .marker {
  background: var(--ai-purple);
  color: white;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 700;
  flex-shrink: 0;
}

.day-section p, .day-section li {
  line-height: 1.7;
}
.day-section li { margin: 0.35rem 0; }

/* ---- Callout boxes -------------------------------- */

.callout {
  border-radius: var(--radius-md);
  padding: 1rem 1.2rem;
  margin: 1rem 0;
  border-left: 4px solid;
}
.callout-tip {
  background: #FFF9EA;
  border-color: #D9A443;
}
.callout-warn {
  background: #FEF1F1;
  border-color: #C0392B;
}
.callout-link {
  background: var(--ai-purple-bg);
  border-color: var(--ai-purple);
}
.callout .label {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 700;
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 0.3rem;
}
.callout-tip .label { color: #A06E10; }
.callout-warn .label { color: #A02020; }
.callout-link .label { color: var(--ai-purple-dark); }

/* ---- Exercise box --------------------------------- */

.exercise-box {
  background: var(--ai-purple-bg);
  border: 1px solid var(--ai-purple-light);
  border-radius: var(--radius-md);
  padding: 1.4rem 1.6rem;
  margin: 1.2rem 0;
}
.exercise-box h3 {
  margin: 0 0 0.6rem;
  color: var(--ai-purple-dark);
  font-size: 1.05rem;
}

/* ---- Mark complete button ------------------------- */

.mark-complete-wrap {
  margin: 2.5rem 0 1.5rem;
  padding: 1.5rem;
  background: white;
  border: 2px dashed var(--ai-purple-light);
  border-radius: var(--radius-md);
  text-align: center;
}
.mark-complete-wrap.done {
  background: var(--ai-purple-bg);
  border-style: solid;
  border-color: var(--ai-purple);
}
.mark-complete-btn {
  background: var(--ai-purple);
  color: white;
  border: none;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
  font-family: inherit;
}
.mark-complete-btn:hover { background: var(--ai-purple-dark); }
.mark-complete-btn.done {
  background: var(--success);
}
.mark-complete-btn.done::before { content: ""; }
.mark-complete-status {
  margin-top: 0.6rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

/* ---- Day navigation ------------------------------- */

.day-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin: 2rem 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
}
.day-nav a {
  color: var(--ai-purple);
  font-weight: 500;
  text-decoration: none;
}
.day-nav a:hover { text-decoration: underline; }
.day-nav .all-days { font-size: 0.9rem; color: var(--text-light); }

/* ---- Certificate section -------------------------- */

.cert-status {
  background: white;
  border: 2px solid var(--ai-purple);
  border-radius: var(--radius-lg);
  padding: 2rem 1.8rem;
  text-align: center;
  margin: 2rem 0;
}
.cert-status.locked {
  background: var(--background-alt);
  border-style: dashed;
  border-color: var(--border-color);
}
.cert-status h2 { margin-top: 0; }
.cert-preview {
  margin: 1.5rem auto;
  border: 1px solid var(--ai-purple-light);
  padding: 1rem;
  background: white;
  max-width: 560px;
}
.cert-btn {
  display: inline-block;
  background: var(--ai-purple);
  color: white;
  padding: 0.85rem 2rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  text-decoration: none;
  margin-top: 1rem;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  font-family: inherit;
}
.cert-btn:hover { background: var(--ai-purple-dark); }
.cert-btn:disabled { background: var(--border-color); color: var(--text-light); cursor: not-allowed; }

.name-input {
  display: inline-block;
  padding: 0.6rem 0.9rem;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  min-width: 260px;
  margin: 0.6rem 0;
  font-family: inherit;
}

/* ---- Utility ------------------------------------- */

.text-center { text-align: center; }
.mt-lg { margin-top: 2rem; }

@media (max-width: 600px) {
  .ai-hero .hero-meta { gap: 1rem; }
  .day-hero { padding: 1.8rem 1.4rem; }
  .day-hero h1 { font-size: 1.7rem; }
}