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

:root {
    --bg: #0b0f1a;
    --bg-card: #111827;
    --bg-card-hover: #1a2236;
    --bg-card-selected: #0f2a3d;
    --border: #1e293b;
    --border-selected: #0ea5e9;
    --accent: #0ea5e9;
    --accent-hover: #38bdf8;
    --text: #e2e8f0;
    --text-muted: #94a3b8;
    --text-heading: #f1f5f9;
    --success: #10b981;
    --error: #ef4444;
    --radius: 12px;
}

html { scroll-behavior: smooth; }

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

/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(11, 15, 26, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.wordmark {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-heading);
    letter-spacing: -0.5px;
}
.wordmark span { color: var(--accent); }
.wordmark { letter-spacing: -0.3px; }

.lang-selector select {
    background: var(--bg-card);
    color: var(--text);
    border: 1px solid var(--border);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 0.85rem;
    cursor: pointer;
    outline: none;
}
.lang-selector select:focus { border-color: var(--accent); }

/* Main */
main {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 24px 60px;
}

/* Hero */
.hero {
    text-align: center;
    padding: 64px 0 48px;
}
.hero h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-heading);
    line-height: 1.2;
    margin-bottom: 16px;
}
.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 520px;
    margin: 0 auto;
}

/* Cards */
.cards {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 48px;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.25s ease;
    overflow: hidden;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeUp 0.5s ease forwards;
}
.card:nth-child(1) { animation-delay: 0.05s; }
.card:nth-child(2) { animation-delay: 0.1s; }
.card:nth-child(3) { animation-delay: 0.15s; }
.card:nth-child(4) { animation-delay: 0.2s; }

@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}

.card:hover { background: var(--bg-card-hover); border-color: #2a3a52; }
.card.selected {
    background: var(--bg-card-selected);
    border-color: var(--border-selected);
    box-shadow: 0 0 0 1px var(--border-selected), 0 4px 24px rgba(14, 165, 233, 0.08);
}

.card-header {
    padding: 24px 28px;
    position: relative;
}
.card-check {
    position: absolute;
    top: 24px;
    right: 24px;
    width: 28px;
    height: 28px;
    border: 2px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}
.card-check svg {
    width: 16px;
    height: 16px;
    opacity: 0;
    transition: opacity 0.2s ease;
    color: var(--accent);
}
.card.selected .card-check {
    border-color: var(--accent);
    background: rgba(14, 165, 233, 0.15);
}
.card.selected .card-check svg { opacity: 1; }

.card-icon { font-size: 1.8rem; margin-bottom: 12px; }
.card h2 {
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-heading);
    margin-bottom: 8px;
    padding-right: 40px;
}
.card p {
    font-size: 0.92rem;
    color: var(--text-muted);
    line-height: 1.55;
    padding-right: 40px;
}

/* Expand section */
.card-expand {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
    padding: 0 28px;
}
.card.selected .card-expand {
    max-height: 400px;
    padding: 0 28px 24px;
}

.card-expand label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
    margin-top: 16px;
}
.card-expand label:first-child { margin-top: 0; }

.card-expand textarea,
.card-expand select {
    width: 100%;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 10px 14px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    transition: border-color 0.2s ease;
}
.card-expand textarea { min-height: 80px; resize: vertical; }
.card-expand textarea:focus,
.card-expand select:focus { border-color: var(--accent); }

/* Submit section */
.submit-section {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}
.form-group { text-align: left; }
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.form-group input {
    width: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px 14px;
    color: var(--text);
    font-family: inherit;
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s ease;
}
.form-group input:focus { border-color: var(--accent); }

#submitBtn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 14px 48px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s ease, transform 0.15s ease;
}
#submitBtn:hover { background: var(--accent-hover); transform: translateY(-1px); }
#submitBtn:active { transform: translateY(0); }
#submitBtn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.success-msg {
    margin-top: 20px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--success);
}
.error-msg {
    margin-top: 14px;
    font-size: 0.9rem;
    color: var(--error);
}

/* Footer */
footer {
    text-align: center;
    padding: 32px 24px;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
}

/* Responsive */
@media (max-width: 600px) {
    .hero { padding: 40px 0 32px; }
    .card-header { padding: 20px; }
    .card-expand { padding: 0 20px; }
    .card.selected .card-expand { padding: 0 20px 20px; }
    .form-row { grid-template-columns: 1fr; }
}