/* ============================================================
   MeraMentor Courses Platform — Student Dashboard & Auth CSS
   Design: Glassmorphism, green brand, SaaS LMS feel
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

/* ─── CSS Variables ────────────────────────────────────────── */
:root {
    --c-primary:       #1a5c3a;
    --c-primary-dark:  #0f3d26;
    --c-primary-light: #2d8a5e;
    --c-accent:        #4ade80;
    --c-accent-soft:   rgba(74, 222, 128, 0.15);
    --c-bg:            #f0f4f2;
    --c-surface:       #ffffff;
    --c-border:        #e2e8e6;
    --c-text:          #1a1a2e;
    --c-muted:         #6b7280;
    --c-shadow:        0 1px 4px rgba(15,61,38,0.07);
    --c-shadow-md:     0 4px 20px rgba(15,61,38,0.10);
    --c-shadow-lg:     0 12px 48px rgba(15,61,38,0.14);
    --c-radius:        14px;
    --c-radius-lg:     20px;
    --c-radius-xl:     28px;
    --navbar-h:        68px;
}

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

html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--c-bg);
    color: var(--c-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
}

a { text-decoration: none; color: inherit; }
img { max-width: 100%; }

/* ─── Top Navbar ───────────────────────────────────────────── */
.c-navbar {
    height: var(--navbar-h);
    background: var(--c-surface);
    border-bottom: 1px solid var(--c-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--c-shadow);
}

.c-navbar__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 800;
    font-size: 1.1rem;
    letter-spacing: -0.02em;
    color: var(--c-primary);
}

.c-navbar__brand-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 800;
    box-shadow: 0 4px 12px rgba(26,92,58,0.25);
}

.c-navbar__right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.c-navbar__user {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--c-bg);
    border: 1px solid var(--c-border);
    padding: 8px 16px;
    border-radius: 50px;
    font-size: 0.875rem;
    color: var(--c-muted);
    font-weight: 500;
}

.c-navbar__avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.c-btn-logout {
    padding: 9px 18px;
    border-radius: 10px;
    background: transparent;
    border: 1px solid var(--c-border);
    color: var(--c-muted);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.c-btn-logout:hover {
    border-color: #dc2626;
    color: #dc2626;
    background: #fee2e2;
}

/* ─── Page Layout ──────────────────────────────────────────── */
.c-page {
    max-width: 1280px;
    margin: 0 auto;
    padding: 36px 24px;
}

.c-page-header {
    margin-bottom: 32px;
}

.c-page-header h1 {
    font-size: 1.9rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--c-text);
}

.c-page-header p {
    color: var(--c-muted);
    margin-top: 6px;
    font-size: 0.95rem;
}

/* ─── Course Cards Grid ─────────────────────────────────────── */
.c-courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 24px;
}

.c-course-card {
    background: var(--c-surface);
    border-radius: var(--c-radius-lg);
    border: 1px solid var(--c-border);
    box-shadow: var(--c-shadow);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
}

.c-course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--c-shadow-lg);
}

.c-course-card__thumb {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary-light));
    display: block;
}

.c-course-card__thumb-placeholder {
    width: 100%;
    aspect-ratio: 16/9;
    background: linear-gradient(135deg, var(--c-primary-dark) 0%, var(--c-primary-light) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: rgba(255,255,255,0.4);
}

.c-course-card__body {
    padding: 22px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.c-course-card__category {
    display: inline-block;
    padding: 3px 10px;
    background: var(--c-accent-soft);
    color: var(--c-primary);
    font-size: 0.72rem;
    font-weight: 700;
    border-radius: 20px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 10px;
}

.c-course-card__title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--c-text);
    line-height: 1.4;
    margin-bottom: 14px;
    flex: 1;
}

.c-course-card__meta {
    font-size: 0.8rem;
    color: var(--c-muted);
    margin-bottom: 14px;
}

/* ─── Progress Bar ──────────────────────────────────────────── */
.c-progress {
    margin-bottom: 18px;
}

.c-progress__header {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    color: var(--c-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.c-progress__bar {
    height: 8px;
    background: var(--c-border);
    border-radius: 100px;
    overflow: hidden;
}

.c-progress__fill {
    height: 100%;
    background: linear-gradient(90deg, var(--c-primary), var(--c-accent));
    border-radius: 100px;
    transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ─── Buttons ───────────────────────────────────────────────── */
.c-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 11px 22px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.9rem;
    border: none;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s ease;
    text-decoration: none;
    line-height: 1;
}

.c-btn:hover { transform: translateY(-1px); }

.c-btn--primary {
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
    color: #fff;
    box-shadow: 0 4px 14px rgba(26,92,58,0.28);
}

.c-btn--primary:hover {
    background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary));
    box-shadow: 0 6px 20px rgba(26,92,58,0.38);
}

.c-btn--outline {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    color: var(--c-text);
}

.c-btn--outline:hover {
    border-color: var(--c-primary);
    color: var(--c-primary);
}

.c-btn--sm { padding: 8px 16px; font-size: 0.8rem; }
.c-btn--block { width: 100%; }
.c-btn--lg { padding: 15px 28px; font-size: 1rem; }

/* ─── Auth Pages ────────────────────────────────────────────── */
.c-auth-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(135deg, #0f3d26 0%, #1a5c3a 40%, #2d8a5e 80%, #3db87a 100%);
    position: relative;
    overflow: hidden;
}

.c-auth-page::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 25% 25%, rgba(255,255,255,0.06) 0%, transparent 50%),
                      radial-gradient(circle at 75% 75%, rgba(255,255,255,0.04) 0%, transparent 50%);
}

.c-auth-page::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: rgba(255,255,255,0.04);
    top: -200px;
    right: -200px;
    pointer-events: none;
}

.c-auth-wrap {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 440px;
}

.c-auth-card {
    background: rgba(255, 255, 255, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 44px 40px;
    border-radius: var(--c-radius-xl);
    box-shadow: 0 24px 64px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255,255,255,0.3);
    border: 1px solid rgba(255,255,255,0.6);
}

.c-auth-logo {
    text-align: center;
    margin-bottom: 32px;
}

.c-auth-logo-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--c-primary), var(--c-primary-light));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    font-size: 1.6rem;
    box-shadow: 0 8px 24px rgba(26,92,58,0.3);
}

.c-auth-logo h1 {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--c-text);
    letter-spacing: -0.02em;
    margin-bottom: 4px;
}

.c-auth-logo p {
    color: var(--c-muted);
    font-size: 0.875rem;
}

.c-form-group {
    margin-bottom: 20px;
}

.c-form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 8px;
    color: var(--c-text);
}

.c-form-group input {
    width: 100%;
    padding: 13px 16px;
    border: 1.5px solid var(--c-border);
    border-radius: 12px;
    font-family: inherit;
    font-size: 0.95rem;
    background: #f8faf9;
    color: var(--c-text);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
    outline: none;
}

.c-form-group input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 4px rgba(26,92,58,0.10);
    background: #fff;
}

.c-form-group input::placeholder {
    color: #b0b8c0;
}

.c-auth-error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fecaca;
    padding: 13px 16px;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.c-auth-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
    padding: 13px 16px;
    border-radius: 10px;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 20px;
}

.c-auth-hint {
    text-align: center;
    margin-top: 20px;
    font-size: 0.8rem;
    color: var(--c-muted);
}

/* ─── OTP Input ─────────────────────────────────────────────── */
.c-otp-inputs {
    display: flex;
    gap: 10px;
    justify-content: center;
    margin: 24px 0;
}

.c-otp-inputs input {
    width: 54px;
    height: 62px;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    border: 2px solid var(--c-border);
    border-radius: 12px;
    background: #f8faf9;
    color: var(--c-primary);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.15s;
    text-transform: uppercase;
    padding: 0;
}

.c-otp-inputs input:focus {
    border-color: var(--c-primary);
    box-shadow: 0 0 0 3px rgba(26,92,58,0.12);
    background: #fff;
    transform: scale(1.05);
}

.c-otp-inputs input.filled {
    border-color: var(--c-primary-light);
    background: var(--c-accent-soft);
}

.c-otp-timer {
    text-align: center;
    font-size: 0.85rem;
    color: var(--c-muted);
    margin-bottom: 16px;
}

.c-otp-timer span {
    font-weight: 700;
    color: var(--c-primary);
}

/* ─── Empty State ───────────────────────────────────────────── */
.c-empty {
    text-align: center;
    padding: 80px 24px;
}

.c-empty-icon {
    font-size: 4rem;
    margin-bottom: 16px;
    opacity: 0.5;
}

.c-empty h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--c-text);
    margin-bottom: 8px;
}

.c-empty p {
    color: var(--c-muted);
    font-size: 0.9rem;
    max-width: 360px;
    margin: 0 auto;
    line-height: 1.6;
}

/* ─── Alerts ─────────────────────────────────────────────────── */
.c-alert {
    padding: 14px 18px;
    border-radius: 10px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.c-alert--success { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.c-alert--error   { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.c-alert--info    { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

/* ─── Completion Screen ─────────────────────────────────────── */
.c-completion {
    text-align: center;
    max-width: 580px;
    margin: 60px auto;
    background: var(--c-surface);
    border-radius: var(--c-radius-xl);
    border: 1px solid var(--c-border);
    box-shadow: var(--c-shadow-lg);
    overflow: hidden;
}

.c-completion__hero {
    padding: 52px 40px 36px;
    background: linear-gradient(135deg, var(--c-primary-dark), var(--c-primary-light));
}

.c-completion__icon {
    font-size: 5rem;
    margin-bottom: 16px;
    animation: c-bounce 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes c-bounce {
    from { transform: scale(0); opacity: 0; }
    to   { transform: scale(1); opacity: 1; }
}

.c-completion__hero h2 {
    font-size: 1.6rem;
    font-weight: 800;
    color: #fff;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}

.c-completion__hero p {
    color: rgba(255,255,255,0.8);
    font-size: 1rem;
}

.c-completion__body {
    padding: 36px 40px;
}

.c-cert-notice {
    background: linear-gradient(135deg, #fef9e7, #fffbf0);
    border: 1px solid #f0d060;
    border-radius: 14px;
    padding: 20px 24px;
    margin: 20px 0;
    text-align: left;
}

.c-cert-notice h4 {
    font-size: 0.95rem;
    font-weight: 700;
    color: #92400e;
    margin-bottom: 6px;
}

.c-cert-notice p {
    font-size: 0.875rem;
    color: #78350f;
}

/* ─── Responsive ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    .c-navbar {
        padding: 0 16px;
    }

    .c-page {
        padding: 20px 16px;
    }

    .c-auth-card {
        padding: 32px 24px;
    }

    .c-courses-grid {
        grid-template-columns: 1fr;
    }

    .c-otp-inputs input {
        width: 44px;
        height: 52px;
        font-size: 1.2rem;
    }
}

@media (max-width: 480px) {
    .c-navbar__brand span { display: none; }
    .c-navbar__user span:not(.c-navbar__avatar) { display: none; }
}