/* ============================================================
   AI Ad Copy Generator — Styles
   ============================================================ */
:root {
    --bg: #0a0a0f;
    --card: #12121a;
    --card-hover: #181825;
    --border: #1e1e2e;
    --border-hover: #2a2a3e;
    --text: #e4e4e7;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --success: #22c55e;
    --danger: #ef4444;
    --radius-sm: 8px;
    --radius: 12px;
    --radius-lg: 16px;
    --transition: 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse at 50% 0%, var(--glow) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 100%, rgba(0,0,0,0.04) 0%, transparent 40%);
}

.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 24px 20px;
}

/* Header */
header {
    text-align: center;
    padding: 48px 0 32px;
}

.logo-icon {
    font-size: 3.5rem;
    margin-bottom: 4px;
    display: block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

h1 {
    font-size: 2.4rem;
    font-weight: 900;
    background: linear-gradient(135deg, #fca5a5, var(--primary), var(--primary-dark));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    margin-bottom: 8px;
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 520px;
    margin: 0 auto;
}

.social-proof {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    padding: 8px 18px;
    background: var(--card);
    border: 1px solid rgba(239,68,68,0.2);
    border-radius: 25px;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.social-proof .count {
    color: var(--primary);
    font-weight: 700;
}

.social-proof .dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* Cluster Links */
.cluster-links {
    display: flex;
    gap: 8px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.cluster-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 14px;
    background: var(--card);
    border: 1px solid rgba(239,68,68,0.18);
    color: var(--primary);
    border-radius: 20px;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    transition: all var(--transition);
}

.cluster-link:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-1px);
}

.cluster-link.current {
    background: var(--primary);
    color: #fff;
    pointer-events: none;
}

/* Platform Selector */
.platform-selector {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.platform-btn {
    padding: 11px 22px;
    border: 1.5px solid var(--border);
    background: var(--card);
    color: var(--text-secondary);
    border-radius: 28px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all var(--transition);
    white-space: nowrap;
}

.platform-btn:hover {
    border-color: var(--primary);
    color: var(--text);
    background: var(--card-hover);
}

.platform-btn.active {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    box-shadow: 0 0 24px var(--glow);
    transform: scale(1.03);
    font-weight: 700;
}

/* Main Card */
.main-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    margin-bottom: 28px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.3);
}

.input-group {
    margin-bottom: 20px;
}

.input-group label {
    display: block;
    font-weight: 700;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.8px;
}

input[type="text"], textarea {
    width: 100%;
    padding: 14px 16px;
    background: #08080d;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition);
    resize: vertical;
}

textarea {
    min-height: 80px;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(239,68,68,0.1);
}

.chip-selector {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.chip-btn {
    padding: 8px 16px;
    border: 1.5px solid var(--border);
    background: transparent;
    color: var(--text-secondary);
    border-radius: 22px;
    cursor: pointer;
    font-size: 0.84rem;
    font-weight: 500;
    transition: all var(--transition);
}

.chip-btn:hover {
    border-color: var(--primary);
    color: var(--text);
}

.chip-btn.active {
    border-color: var(--primary);
    color: var(--primary);
    font-weight: 600;
}

.generate-btn {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.15rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    letter-spacing: 0.3px;
}

.generate-btn:hover {
    box-shadow: 0 0 40px var(--glow);
    transform: translateY(-2px);
}

.generate-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Results */
.results-section {
    display: none;
}

.results-section.show {
    display: block;
    animation: fadeInUp 0.45s ease;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.results-header h2 {
    font-size: 1.25rem;
    font-weight: 700;
}

.result-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    margin-bottom: 12px;
    transition: all var(--transition);
}

.result-card:hover {
    border-color: var(--primary);
}

.result-card .result-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--primary);
    letter-spacing: 0.5px;
    margin-bottom: 6px;
}

.result-card .result-text {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.5;
    margin-bottom: 10px;
}

.result-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.action-btn {
    padding: 8px 14px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.78rem;
    font-weight: 600;
    transition: all var(--transition);
    white-space: nowrap;
    border: 1px solid transparent;
}

.copy-btn {
    background: rgba(239,68,68,0.12);
    border-color: rgba(239,68,68,0.25);
    color: var(--primary);
}

.copy-btn:hover {
    background: var(--primary);
    color: #fff;
}

.copy-btn.copied {
    background: var(--success);
    border-color: var(--success);
    color: #fff;
}

.copy-all-btn {
    display: block;
    margin: 20px auto 0;
    padding: 12px 28px;
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
    border-radius: 28px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 700;
    transition: all var(--transition);
}

.copy-all-btn:hover {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 0 20px var(--glow);
}

/* Tool Chain */
.tool-chain {
    padding: 28px 24px;
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    margin-bottom: 28px;
    text-align: center;
}

.tool-chain h3 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: var(--text);
}

.tool-chain .chain-hint {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.chain-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.chain-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 11px 20px;
    background: rgba(239,68,68,0.08);
    border: 1px solid rgba(239,68,68,0.2);
    color: var(--primary);
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-size: 0.88rem;
    font-weight: 600;
    transition: all var(--transition);
}

.chain-link:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(239,68,68,0.25);
}

.chain-link.hub {
    background: rgba(255,255,255,0.05);
    border-color: rgba(255,255,255,0.2);
    color: var(--text);
}

.chain-link.hub:hover {
    background: var(--text);
    color: var(--bg);
}

/* FAQ */
.faq-section {
    margin-bottom: 28px;
}

.faq-section h2 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.faq-item {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px 22px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: all var(--transition);
}

.faq-item:hover {
    border-color: var(--border-hover);
    background: var(--card-hover);
}

.faq-question {
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--text);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-arrow {
    color: var(--primary);
    transition: transform 0.3s;
    font-size: 0.8rem;
}

.faq-item.open .faq-arrow {
    transform: rotate(180deg);
}

.faq-answer {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 10px;
    display: none;
    line-height: 1.65;
}

.faq-item.open .faq-answer {
    display: block;
}

/* Education Block */
.education-block {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px 24px;
    margin-bottom: 28px;
}

.education-block h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-align: center;
}

.education-block h3 {
    font-size: 0.95rem;
    font-weight: 700;
    margin: 16px 0 8px;
    color: var(--primary);
}

.education-block p, .education-block li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 8px;
}

.education-block ul, .education-block ol {
    padding-left: 20px;
    margin-bottom: 12px;
}

/* Footer */
footer {
    text-align: center;
    padding: 32px 0;
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border);
    margin-top: 40px;
}

footer a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

footer a:hover {
    text-decoration: underline;
}

footer .footer-links {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
    margin: 8px 0;
}

/* Skeleton */
.skeleton {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px 22px;
    margin-bottom: 12px;
}

.skeleton-line {
    height: 14px;
    background: var(--border);
    border-radius: 4px;
    margin-bottom: 8px;
    animation: shimmer 1.5s ease-in-out infinite;
}

.skeleton-line:nth-child(1) { width: 30%; }
.skeleton-line:nth-child(2) { width: 85%; }
.skeleton-line:nth-child(3) { width: 60%; }

@keyframes shimmer {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

@media (max-width: 640px) {
    .container { padding: 14px; }
    h1 { font-size: 1.7rem; }
    .main-card { padding: 22px 18px; }
    .platform-btn { padding: 9px 15px; font-size: 0.8rem; }
    .result-card { padding: 16px; }
    .results-header { flex-direction: column; gap: 8px; align-items: flex-start; }
}