/* ============================================================
   EduBazar — Course Selling Platform
   Design tokens: professional education platform, restrained,
   no gradients / heavy animation / glassmorphism.
   ============================================================ */

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

:root {
    /* Palette */
    --color-ink:        #16233A;   /* primary text / navy */
    --color-ink-soft:    #4B5A70;  /* secondary text */
    --color-brand:       #1C4C8C;  /* primary action / links */
    --color-brand-dark:  #143A6B;
    --color-accent:      #0E8A6D;  /* success / paid state */
    --color-warn:        #B4530A;  /* locked / pending state */
    --color-danger:      #B3261E;
    --color-bg:          #FBFAF8;  /* page background, warm off-white */
    --color-surface:     #FFFFFF;
    --color-border:      #E4E1DA;
    --color-border-soft: #EDEBE5;

    /* Type */
    --font-body: 'Hind Siliguri', 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Hind Siliguri', 'Inter', system-ui, -apple-system, sans-serif;

    /* Layout */
    --radius: 10px;
    --radius-sm: 6px;
    --shadow-card: 0 1px 3px rgba(22, 35, 58, 0.08), 0 1px 2px rgba(22, 35, 58, 0.06);
    --max-width: 1160px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-ink);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--color-brand);
    text-decoration: none;
}
a:hover { text-decoration: underline; }

img { max-width: 100%; display: block; }

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

h1, h2, h3, h4 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    margin: 0 0 12px;
    color: var(--color-ink);
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 14px; color: var(--color-ink-soft); }

/* Focus visibility for accessibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible, select:focus-visible {
    outline: 2px solid var(--color-brand);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    * { animation: none !important; transition: none !important; }
}

/* ---------------- Header ---------------- */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 50;
}
.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-ink);
    letter-spacing: -0.01em;
}
.logo:hover { text-decoration: none; }

.main-nav { display: flex; gap: 28px; align-items: center; }
.main-nav a {
    color: var(--color-ink);
    font-weight: 500;
    font-size: 0.97rem;
}
.main-nav a:hover { color: var(--color-brand); text-decoration: none; }

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
}
.menu-toggle span {
    display: block;
    height: 2px;
    background: var(--color-ink);
    border-radius: 2px;
}

/* ---------------- Buttons ---------------- */
.btn {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.97rem;
    font-weight: 600;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    cursor: pointer;
    text-align: center;
}
.btn:hover { text-decoration: none; }
.btn-primary {
    background: var(--color-brand);
    color: #fff;
}
.btn-primary:hover { background: var(--color-brand-dark); }
.btn-outline {
    background: transparent;
    border-color: var(--color-border);
    color: var(--color-ink);
}
.btn-outline:hover { border-color: var(--color-brand); color: var(--color-brand); }
.btn-block { display: block; width: 100%; }
.btn-success { background: var(--color-accent); color: #fff; }
.btn-success:hover { background: #0b6f57; }
.btn-disabled, .btn:disabled {
    background: var(--color-border-soft);
    color: var(--color-ink-soft);
    cursor: not-allowed;
    border-color: var(--color-border);
}

/* ---------------- Hero / Intro ---------------- */
.hero {
    padding: 44px 0 28px;
    border-bottom: 1px solid var(--color-border-soft);
}
.hero h1 { max-width: 640px; }
.hero p.lead {
    max-width: 560px;
    font-size: 1.05rem;
}

/* ---------------- Section ---------------- */
.section { padding: 40px 0; }
.section-head {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 22px;
}
.section-head h2 { margin: 0; }
.section-head a { font-size: 0.92rem; font-weight: 600; }

/* ---------------- Course Grid & Card ---------------- */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
@media (min-width: 1000px) {
    .course-grid.grid-4 { grid-template-columns: repeat(4, 1fr); }
}

.course-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-card);
}
.course-card .thumb {
    aspect-ratio: 16 / 9;
    background: var(--color-border-soft);
    overflow: hidden;
}
.course-card .thumb img { width: 100%; height: 100%; object-fit: cover; }
.course-card .body {
    padding: 16px 18px 18px;
    display: flex;
    flex-direction: column;
    flex: 1;
}
.course-card h3 { margin-bottom: 6px; }
.course-card h3 a { color: var(--color-ink); }
.course-card h3 a:hover { color: var(--color-brand); text-decoration: none; }
.course-card .desc {
    font-size: 0.92rem;
    margin-bottom: 12px;
    flex: 1;
}
.course-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 6px 14px;
    font-size: 0.83rem;
    color: var(--color-ink-soft);
    margin-bottom: 14px;
}
.course-meta span { display: inline-flex; align-items: center; gap: 4px; }
.course-card .price-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: auto;
}
.price-tag {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-ink);
}

/* ---------------- Course Details Page ---------------- */
.details-layout {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 32px;
    align-items: start;
}
.details-thumb {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
    margin-bottom: 20px;
}
.details-block { margin-bottom: 26px; }
.details-block h2 { font-size: 1.2rem; }

.sidebar-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow-card);
    position: sticky;
    top: 84px;
}
.sidebar-card .price-tag { font-size: 1.6rem; display: block; margin-bottom: 4px; }
.sidebar-list {
    list-style: none;
    padding: 0;
    margin: 16px 0;
    font-size: 0.92rem;
    color: var(--color-ink-soft);
}
.sidebar-list li {
    display: flex;
    justify-content: space-between;
    padding: 8px 0;
    border-bottom: 1px solid var(--color-border-soft);
}
.sidebar-list li:last-child { border-bottom: none; }

.bullet-list {
    margin: 0;
    padding-left: 20px;
    color: var(--color-ink-soft);
}
.bullet-list li { margin-bottom: 6px; }

/* ---------------- Forms ---------------- */
.form-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 28px;
    max-width: 560px;
    margin: 0 auto;
    box-shadow: var(--shadow-card);
}
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.92rem;
    margin-bottom: 6px;
}
.form-group .hint { font-size: 0.8rem; color: var(--color-ink-soft); margin-top: 4px; }
.form-control {
    width: 100%;
    padding: 11px 13px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 0.97rem;
    background: var(--color-surface);
    color: var(--color-ink);
}
.form-control:focus {
    border-color: var(--color-brand);
    outline: none;
    box-shadow: 0 0 0 3px rgba(28, 76, 140, 0.12);
}
.field-error {
    color: var(--color-danger);
    font-size: 0.83rem;
    margin-top: 5px;
}
.form-control.has-error { border-color: var(--color-danger); }

/* ---------------- Alerts / Badges ---------------- */
.alert {
    padding: 13px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.92rem;
    margin: 16px 0;
    border: 1px solid transparent;
}
.alert-success { background: #E9F7F1; color: #0B6F57; border-color: #C7EBDD; }
.alert-error { background: #FBEBEA; color: #8C231C; border-color: #F3C9C6; }
.alert-info { background: #EBF2FB; color: #143A6B; border-color: #CADDF3; }

.badge {
    display: inline-block;
    padding: 4px 11px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 600;
}
.badge-paid { background: #E9F7F1; color: #0B6F57; }
.badge-pending { background: #FBF2E6; color: #8A4A0B; }
.badge-cancelled, .badge-expired { background: #FBEBEA; color: #8C231C; }

/* ---------------- My Courses ---------------- */
.enroll-list { display: flex; flex-direction: column; gap: 14px; }
.enroll-row {
    display: flex;
    align-items: center;
    gap: 18px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px 18px;
    box-shadow: var(--shadow-card);
}
.enroll-row .thumb {
    width: 96px;
    height: 64px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background: var(--color-border-soft);
}
.enroll-row .thumb img { width: 100%; height: 100%; object-fit: cover; }
.enroll-row .info { flex: 1; min-width: 0; }
.enroll-row .info h3 { margin-bottom: 4px; font-size: 1rem; }
.enroll-row .meta-line { font-size: 0.83rem; color: var(--color-ink-soft); }
.enroll-row .action { flex-shrink: 0; }

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-ink-soft);
}

/* ---------------- Access Page ---------------- */
.access-box {
    max-width: 560px;
    margin: 0 auto;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 32px;
    text-align: center;
    box-shadow: var(--shadow-card);
}
.access-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 16px;
    font-size: 1.6rem;
}
.access-icon.locked { background: #FBF2E6; color: var(--color-warn); }
.access-icon.unlocked { background: #E9F7F1; color: var(--color-accent); }

/* ---------------- Footer ---------------- */
.site-footer {
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    padding: 28px 0;
    margin-top: 40px;
}
.footer-inner {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.footer-brand { font-weight: 700; margin: 0; }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { font-size: 0.88rem; color: var(--color-ink-soft); }
.footer-copy { width: 100%; font-size: 0.82rem; color: var(--color-ink-soft); margin: 8px 0 0; }

/* ---------------- Breadcrumb ---------------- */
.breadcrumb {
    font-size: 0.85rem;
    color: var(--color-ink-soft);
    margin-bottom: 18px;
}
.breadcrumb a { color: var(--color-ink-soft); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 900px) {
    .course-grid, .course-grid.grid-4 { grid-template-columns: repeat(2, 1fr); }
    .details-layout { grid-template-columns: 1fr; }
    .sidebar-card { position: static; }
}

@media (max-width: 620px) {
    .header-inner { height: 58px; }
    .menu-toggle { display: flex; }
    .main-nav {
        position: absolute;
        top: 58px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 8px 20px 14px;
        display: none;
    }
    .main-nav.open { display: flex; }
    .main-nav a { width: 100%; padding: 10px 0; border-bottom: 1px solid var(--color-border-soft); }
    .main-nav a:last-child { border-bottom: none; }

    .course-grid, .course-grid.grid-4 { grid-template-columns: 1fr; }
    h1 { font-size: 1.55rem; }
    .hero { padding: 30px 0 22px; }
    .enroll-row { flex-wrap: wrap; }
    .enroll-row .action { width: 100%; }
    .enroll-row .action .btn { width: 100%; }
    .form-card { padding: 20px; }
}