/* ═══════════════════════════════════════════════════════════
   RepuGlean — Premium Dark Theme
   Design tokens, layout, components, animations
   ═══════════════════════════════════════════════════════════ */

/* ── Design Tokens ── */
:root {
    /* Palette */
    --bg-primary:       #0a0e1a;
    --bg-secondary:     #111827;
    --bg-card:          rgba(17, 24, 39, 0.7);
    --bg-card-hover:    rgba(30, 41, 59, 0.8);
    --bg-glass:         rgba(255, 255, 255, 0.03);

    --text-primary:     #f1f5f9;
    --text-secondary:   #94a3b8;
    --text-muted:       #64748b;

    --accent:           #6366f1;
    --accent-light:     #818cf8;
    --accent-glow:      rgba(99, 102, 241, 0.25);
    --accent-gradient:  linear-gradient(135deg, #6366f1 0%, #a855f7 50%, #ec4899 100%);

    --success:          #34d399;
    --warning:          #fbbf24;
    --danger:           #f87171;

    --border:           rgba(148, 163, 184, 0.08);
    --border-accent:    rgba(99, 102, 241, 0.3);

    /* Typography */
    --font:             'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --radius:           12px;
    --radius-lg:        20px;
    --container:        1100px;
}

/* ── Reset & Base ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

body {
    font-family: var(--font);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a { color: var(--accent-light); text-decoration: none; transition: color .2s; }
a:hover { color: #c4b5fd; }

.section-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

.optional { color: var(--text-muted); font-weight: 400; font-size: 0.85em; }

/* ═══════════════ NAVBAR ═══════════════ */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    backdrop-filter: blur(20px);
    background: rgba(10, 14, 26, 0.8);
    border-bottom: 1px solid var(--border);
    transition: background .3s;
}

.nav-container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}

.nav-logo {
    display: flex; align-items: center; gap: 8px;
    font-size: 1.3rem; font-weight: 700; color: var(--text-primary);
}

.logo-icon {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-size: 1.5rem;
}

.logo-accent { color: var(--accent-light); }
.logo-text .logo-accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links { display: flex; align-items: center; gap: 28px; }

.nav-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color .2s;
}
.nav-link:hover { color: var(--text-primary); }

.nav-cta {
    background: var(--accent);
    color: #fff !important;
    padding: 8px 20px;
    border-radius: 8px;
    font-weight: 600;
    transition: background .2s, transform .15s;
}
.nav-cta:hover {
    background: var(--accent-light);
    transform: translateY(-1px);
}

/* ═══════════════ HERO ═══════════════ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center;
    padding: 120px 24px 80px;
    overflow: hidden;
}

.hero-bg-effects { position: absolute; inset: 0; pointer-events: none; }

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: orbFloat 8s ease-in-out infinite alternate;
}
.hero-orb-1 { width: 500px; height: 500px; background: #6366f1; top: -10%; left: -5%; }
.hero-orb-2 { width: 400px; height: 400px; background: #a855f7; bottom: -10%; right: -5%; animation-delay: -4s; }

@keyframes orbFloat {
    0%   { transform: translate(0, 0) scale(1); }
    100% { transform: translate(40px, -30px) scale(1.1); }
}

.hero-grid {
    position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(99,102,241,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99,102,241,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}

.hero-content { position: relative; z-index: 1; max-width: 720px; }

.hero-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--bg-glass);
    border: 1px solid var(--border-accent);
    color: var(--accent-light);
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 28px;
    letter-spacing: 0.02em;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 560px;
    margin: 0 auto 40px;
    line-height: 1.7;
}

.hero-cta {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 32px;
    background: var(--accent-gradient);
    color: #fff;
    font-weight: 600;
    font-size: 1.05rem;
    border-radius: 12px;
    transition: transform .2s, box-shadow .2s;
    box-shadow: 0 4px 30px var(--accent-glow);
}
.hero-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 40px var(--accent-glow);
    color: #fff;
}

/* ═══════════════ HOW IT WORKS ═══════════════ */
.how-section {
    padding: 100px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 56px;
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 28px;
}

.step-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: border-color .3s, transform .3s;
    backdrop-filter: blur(10px);
}
.step-card:hover {
    border-color: var(--border-accent);
    transform: translateY(-4px);
}

.step-number {
    position: absolute; top: 16px; right: 20px;
    font-size: 3rem; font-weight: 800;
    color: rgba(99, 102, 241, 0.08);
    line-height: 1;
}

.step-icon { font-size: 2rem; margin-bottom: 16px; }
.step-card h3 { font-size: 1.2rem; margin-bottom: 10px; font-weight: 600; }
.step-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.6; }

/* ═══════════════ SCAN SECTION ═══════════════ */
.scan-section {
    padding: 100px 0;
}

/* ── Form ── */
.scan-form, .contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-row { margin-bottom: 18px; }
.form-row-2col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.input-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: border-color .2s, box-shadow .2s;
    outline: none;
}

.input-group input:focus,
.input-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.input-group textarea { resize: vertical; min-height: 100px; }

.btn-scan, .btn-primary {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    width: 100%;
    padding: 14px 28px;
    background: var(--accent-gradient);
    color: #fff;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: transform .15s, box-shadow .2s, opacity .2s;
    box-shadow: 0 4px 20px var(--accent-glow);
    margin-top: 8px;
}

.btn-scan:hover, .btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 30px var(--accent-glow);
}

.btn-scan:disabled, .btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.spinner {
    display: inline-block;
    width: 18px; height: 18px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin .6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Results Panel ── */
.results-panel {
    max-width: 700px;
    margin: 40px auto 0;
    background: var(--bg-card);
    border: 1px solid var(--border-accent);
    border-radius: var(--radius-lg);
    overflow: hidden;
    animation: slideUp .5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to   { opacity: 1; transform: translateY(0); }
}

.results-header {
    padding: 24px 32px;
    border-bottom: 1px solid var(--border);
    background: rgba(99, 102, 241, 0.05);
}
.results-header h3 { font-size: 1.3rem; margin-bottom: 4px; }
.results-url { color: var(--text-muted); font-size: 0.9rem; }

.cached-tag {
    display: inline-block;
    padding: 3px 10px;
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: rgba(251, 191, 36, 0.12);
    color: var(--warning);
    border: 1px solid rgba(251, 191, 36, 0.25);
    border-radius: 100px;
    margin-left: 10px;
    vertical-align: middle;
}

.results-body { padding: 32px; }

/* Gauge */
.score-gauge-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    margin-bottom: 28px;
}

.score-gauge {
    position: relative;
    width: 160px; height: 160px;
}

.gauge-ring {
    position: absolute; inset: 0;
    border-radius: 50%;
    background: conic-gradient(
        var(--accent) 0deg,
        var(--accent) 0deg,
        rgba(99,102,241,0.1) 0deg
    );
    transition: background 1.5s ease-out;
    mask: radial-gradient(transparent 58px, #000 59px);
    -webkit-mask: radial-gradient(transparent 58px, #000 59px);
}

.gauge-inner {
    position: absolute; inset: 0;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
}

.gauge-score {
    font-size: 2.8rem;
    font-weight: 800;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.gauge-label { font-size: 0.8rem; color: var(--text-muted); }

.grade-badge {
    font-size: 3.5rem;
    font-weight: 900;
    width: 96px; height: 96px;
    display: flex; align-items: center; justify-content: center;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 3px solid var(--accent);
    color: var(--accent-light);
    box-shadow: 0 0 40px var(--accent-glow);
}

.grade-A { border-color: var(--success); color: var(--success); box-shadow: 0 0 40px rgba(52,211,153,0.25); }
.grade-B { border-color: #60a5fa; color: #60a5fa; box-shadow: 0 0 40px rgba(96,165,250,0.25); }
.grade-C { border-color: var(--warning); color: var(--warning); box-shadow: 0 0 40px rgba(251,191,36,0.25); }
.grade-D { border-color: #fb923c; color: #fb923c; box-shadow: 0 0 40px rgba(251,146,60,0.25); }
.grade-F { border-color: var(--danger); color: var(--danger); box-shadow: 0 0 40px rgba(248,113,113,0.25); }

.results-summary {
    background: var(--bg-glass);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 28px;
}

.results-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.results-col h4 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.issues-list, .improvements-list {
    list-style: none;
    display: flex; flex-direction: column; gap: 10px;
}

.issues-list li, .improvements-list li {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 0.88rem;
    line-height: 1.5;
}

.issues-list li {
    background: rgba(248, 113, 113, 0.06);
    border-left: 3px solid var(--danger);
    color: var(--text-secondary);
}
.issues-list li.severity-medium {
    background: rgba(251, 191, 36, 0.06);
    border-left-color: var(--warning);
}

.improvements-list li {
    background: rgba(52, 211, 153, 0.06);
    border-left: 3px solid var(--success);
    color: var(--text-secondary);
}

.results-cta {
    padding: 24px 32px;
    border-top: 1px solid var(--border);
    text-align: center;
    background: rgba(99, 102, 241, 0.03);
}
.results-cta p { color: var(--text-secondary); margin-bottom: 16px; font-size: 0.95rem; }
.results-cta .btn-primary { width: auto; padding: 12px 28px; }

/* ── Error panel ── */
.error-panel {
    max-width: 600px;
    margin: 24px auto 0;
    padding: 18px 24px;
    background: rgba(248, 113, 113, 0.08);
    border: 1px solid rgba(248, 113, 113, 0.2);
    border-radius: var(--radius);
    color: var(--danger);
    font-size: 0.95rem;
    animation: slideUp .4s ease-out;
}

/* ═══════════════ FAQ SECTION ═══════════════ */
.faq-section {
    padding: 100px 0;
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.faq-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: border-color 0.3s;
}

.faq-item[open] {
    border-color: var(--border-accent);
}

.faq-question {
    padding: 20px 24px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: color 0.2s;
}

.faq-question::-webkit-details-marker { display: none; }

.faq-question::after {
    content: '+';
    font-size: 1.4rem;
    font-weight: 300;
    color: var(--accent-light);
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 16px;
}

.faq-item[open] .faq-question::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-question:hover {
    color: var(--accent-light);
}

.faq-answer {
    padding: 0 24px 20px;
    animation: faqFadeIn 0.3s ease-out;
}

.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

@keyframes faqFadeIn {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ═══════════════ CONTACT SECTION ═══════════════ */
.contact-section {
    padding: 100px 0;
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
}

.contact-success {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
    animation: slideUp .5s ease-out;
}
.success-icon {
    width: 64px; height: 64px;
    line-height: 64px;
    border-radius: 50%;
    background: rgba(52, 211, 153, 0.1);
    border: 2px solid var(--success);
    color: var(--success);
    font-size: 2rem;
    margin: 0 auto 16px;
}
.contact-success h3 { font-size: 1.3rem; margin-bottom: 8px; }
.contact-success p { color: var(--text-secondary); }

/* ═══════════════ FOOTER ═══════════════ */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
}

.footer-content {
    display: flex; align-items: center; justify-content: space-between;
    flex-wrap: wrap; gap: 16px;
}

.footer-brand {
    display: flex; align-items: center; gap: 10px;
    flex-wrap: wrap;
}
.footer-brand p { color: var(--text-muted); font-size: 0.85rem; width: 100%; margin-top: 4px; }

.footer-copy { color: var(--text-muted); font-size: 0.85rem; }

/* ═══════════════ RESPONSIVE ═══════════════ */
@media (max-width: 768px) {
    .nav-links { gap: 16px; }
    .form-row-2col { grid-template-columns: 1fr; }
    .results-columns { grid-template-columns: 1fr; }
    .score-gauge-container { flex-direction: column; gap: 20px; }
    .hero-title { font-size: 2.2rem; }
    .steps-grid { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .nav-container { padding: 0 16px; }
    .nav-link:not(.nav-cta) { display: none; }
    .section-container { padding: 0 16px; }
}