/**
 * Premium SaaS Design System
 * Inspired by Stripe, Apple, Coursera, Notion
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
  /* Primary - refined blue (Stripe/Coursera) */
  --color-primary: #635BFF;
  --color-primary-hover: #0A2540;
  --color-primary-muted: rgba(99, 91, 255, 0.12);
  --color-accent: #00D4AA;

  /* Neutrals - Apple/Notion style */
  --color-bg: #FAFBFC;
  --color-bg-elevated: #FFFFFF;
  --color-bg-subtle: #F6F8FA;
  --color-text: #0A2540;
  --color-text-secondary: #425466;
  --color-text-muted: #688199;
  --color-border: #E3E8EE;
  --color-border-strong: #CDD7E0;

  /* Header */
  --header-bg: rgba(255, 255, 255, 0.8);
  --header-bg-solid: #FFFFFF;
  --header-height: 72px;
  --header-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
  --header-blur: saturate(180%) blur(20px);

  /* Footer */
  --footer-bg: #0A2540;
  --footer-text: #A4B4C4;
  --footer-link-hover: #FFFFFF;

  /* Spacing - 8px grid */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --tracking-tight: -0.025em;
  --tracking-tighter: -0.05em;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-2xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(10, 37, 64, 0.04);
  --shadow-sm: 0 2px 4px rgba(10, 37, 64, 0.06), 0 4px 8px rgba(10, 37, 64, 0.04);
  --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.08), 0 8px 24px rgba(10, 37, 64, 0.04);
  --shadow-lg: 0 12px 40px rgba(10, 37, 64, 0.12), 0 4px 12px rgba(10, 37, 64, 0.06);
  --shadow-card: 0 0 0 1px rgba(10, 37, 64, 0.06), 0 2px 4px rgba(10, 37, 64, 0.04);

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;
}

/* Base */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  padding-top: var(--header-height);
  line-height: var(--leading-normal);
  font-size: var(--text-base);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Section spacing */
.content-section {
  padding: var(--space-12) 0;
}

.section-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-6);
  letter-spacing: var(--tracking-tight);
  line-height: var(--leading-tight);
}

.section-title.coursera-style {
  font-size: var(--text-xl);
  font-weight: 600;
  margin-bottom: var(--space-5);
  color: var(--color-text);
}

/* ----- Hero (Stripe/Apple style) ----- */
.hero-coursera {
  position: relative;
  background: linear-gradient(180deg, #F6F8FA 0%, #FAFBFC 50%, var(--color-bg) 100%);
  padding: var(--space-20) 0;
  margin-bottom: var(--space-12);
  text-align: center;
  overflow: hidden;
}

.hero-coursera::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 140%;
  height: 100%;
  background: radial-gradient(ellipse at center, var(--color-primary-muted) 0%, transparent 70%);
  pointer-events: none;
  opacity: 0.6;
}

.hero-coursera .container {
  position: relative;
  z-index: 1;
}

.hero-coursera h1 {
  font-size: clamp(2.25rem, 5vw, 3.5rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  letter-spacing: var(--tracking-tighter);
  line-height: 1.1;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.hero-coursera .hero-sub {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-8);
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
  line-height: var(--leading-snug);
}

.hero-coursera .btn-join {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: #fff !important;
  font-weight: 600;
  font-size: var(--text-base);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  border: none;
  text-decoration: none;
  transition: transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    background var(--duration-fast);
  box-shadow: 0 2px 4px rgba(99, 91, 255, 0.2);
}

.hero-coursera .btn-join:hover {
  background: var(--color-primary-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 91, 255, 0.25);
}

.hero-coursera .btn-join:active {
  transform: translateY(0);
}

/* ----- Course cards (premium card design) ----- */
.movie-grid {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 576px) {
  .movie-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 768px) {
  .movie-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 992px) {
  .movie-grid { grid-template-columns: repeat(4, 1fr); }
}

.course-card {
  transition: transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out),
    border-color var(--duration-fast);
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-card);
  cursor: pointer;
  text-decoration: none;
  display: block;
  text-align: left;
  padding: 0;
  width: 100%;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-border-strong);
}

.course-card .card-img-top {
  height: 180px;
  object-fit: cover;
  transition: transform var(--duration-slow) var(--ease-out);
}

.course-card:hover .card-img-top {
  transform: scale(1.03);
}

.course-card .card-body {
  padding: var(--space-5);
}

.course-card .card-title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin: 0;
  line-height: var(--leading-snug);
  transition: color var(--duration-fast);
}

.course-card:hover .card-title {
  color: var(--color-primary);
}

/* Generic cards */
.card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  background: var(--color-bg-elevated);
  box-shadow: var(--shadow-card);
  transition: transform var(--duration-normal) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card .card-img-top {
  height: 200px;
  object-fit: cover;
}

.card .card-body {
  padding: var(--space-5);
}

.card .card-title {
  font-weight: 600;
  color: var(--color-text);
}

.course-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-normal);
}

/* Buttons */
.btn-primary {
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  padding: var(--space-3) var(--space-5);
  font-size: var(--text-sm);
  transition: transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast),
    box-shadow var(--duration-fast);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 91, 255, 0.2);
}

.btn-primary:active {
  transform: translateY(0);
}

/* New courses list - Notion-style rows */
.list-group-item-action {
  border-radius: var(--radius-md) !important;
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-2) !important;
  background: var(--color-bg-elevated) !important;
  padding: var(--space-4) var(--space-5) !important;
  transition: background var(--duration-fast), border-color var(--duration-fast),
    box-shadow var(--duration-fast);
}

.list-group-item-action:hover {
  background: var(--color-bg-subtle) !important;
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-xs);
}

.list-group-item-action .text-primary {
  color: var(--color-primary) !important;
  font-weight: 600;
  font-size: var(--text-base);
}

/* Request form - premium input styling */
.form-control {
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-base);
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}

.form-control:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-muted);
  outline: none;
}

.form-control::placeholder {
  color: var(--color-text-muted);
}

.btn-success {
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 600;
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-base);
  transition: transform var(--duration-fast) var(--ease-out),
    background var(--duration-fast),
    box-shadow var(--duration-fast);
}

.btn-success:hover {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 91, 255, 0.2);
}

/* Request form section container */
.request-form-wrapper {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--duration-normal);
}

.request-form-wrapper:focus-within {
  box-shadow: var(--shadow-sm);
}

/* Category pills (content.php) - premium style */
.categories-coursera .btn-outline-primary {
  border: 1px solid var(--color-border-strong);
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  padding: var(--space-2) var(--space-4);
  font-weight: 500;
  transition: border-color var(--duration-fast), color var(--duration-fast),
    background var(--duration-fast);
}

.categories-coursera .btn-outline-primary:hover {
  background: var(--color-bg-subtle);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* Responsive */
@media (max-width: 991px) {
  .content-section { padding: var(--space-8) 0; }
  .section-title { font-size: var(--text-xl); }
  .hero-coursera { padding: var(--space-16) 0; }
}

@media (max-width: 768px) {
  body { padding-top: 64px; }
  .content-section { padding: var(--space-6) 0; }
  .hero-coursera { padding: var(--space-12) 0; }
  .course-card .card-img-top { height: 160px; }
  .card .card-img-top { height: 180px; }
}

@media (max-width: 576px) {
  .course-card .card-img-top { height: 140px; }
  .hero-coursera h1 { font-size: var(--text-2xl); }
  .hero-coursera .hero-sub { font-size: var(--text-base); }
}















/* GLOBAL */
body {
    font-family: 'Inter', sans-serif;
    background: #f8f9fb;
}

/* TITLES */
.section-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 25px;
}

/* COURSE CARD (Netflix Style) */
.course-card {
    border: none;
    border-radius: 16px;
    overflow: hidden;
    transition: all 0.3s ease;
    background: #fff;
}

.course-card img {
    height: 180px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.course-card:hover img {
    transform: scale(1.08);
}

.course-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.1);
}

/* BUTTON */
.btn-primary {
    background: linear-gradient(135deg, #635bff, #4f46e5);
    border: none;
    border-radius: 10px;
}

.btn-primary:hover {
    opacity: 0.9;
}

/* SEARCH BOX */
.premium-search {
    border-radius: 25px;
    padding: 10px 20px;
}

/* HERO */
.hero-coursera {
    background: linear-gradient(135deg, #1e1e2f, #2a2a72);
    color: white;
    padding: 80px 20px;
    text-align: center;
    border-radius: 0 0 30px 30px;
}

.hero-coursera h1 {
    font-size: 3rem;
    font-weight: 700;
}

.hero-sub {
    opacity: 0.8;
    margin-bottom: 20px;
}

.btn-join {
    background: #fff;
    color: #000;
    padding: 10px 25px;
    border-radius: 25px;
    font-weight: 600;
}