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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --accent: #0284c7;
    --accent-dark: #0369a1;
    --accent-light: #e0f2fe;
    --text: #1f2937;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --bg: #f3f4f6;
    --surface: #ffffff;
    --success: #10b981;
    --success-bg: #ecfdf5;
    --danger: #ef4444;
    --danger-bg: #fef2f2;
    --radius: 0.75rem;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 8px 24px rgba(0, 0, 0, 0.08);
    --page-gradient: linear-gradient(135deg, #0f172a 0%, #1e3a8a 48%, #0369a1 100%);
    --brand-gradient: linear-gradient(135deg, #38bdf8, #0284c7);
}

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

html, body {
    margin: 0;
    padding: 0;
    min-height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text);
    background: var(--page-gradient);
    -webkit-font-smoothing: antialiased;
}

.subscribe-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1.25rem;
}

.subscribe-shell {
    width: 100%;
    max-width: 520px;
}

.subscribe-brand {
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 1.25rem;
}

.subscribe-brand h1 {
    margin: 0 0 0.35rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: #fff;
}

.subscribe-brand p {
    margin: 0;
    font-size: 0.9375rem;
    opacity: 0.85;
}

.subscribe-card {
    background: var(--surface);
    border-radius: 1rem;
    padding: 2rem;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
}

.subscribe-card h2 {
    margin: 0 0 0.35rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.subscribe-card .subtitle {
    margin: 0 0 1.5rem;
    color: var(--text-muted);
    font-size: 0.9375rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 0.375rem;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font: inherit;
    color: var(--text);
    background: #fff;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.package-option {
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.875rem 1rem;
    margin-bottom: 0.625rem;
    cursor: pointer;
    transition: border-color 0.15s, background 0.15s;
}

.package-option:hover {
    border-color: #93c5fd;
    background: #f8fafc;
}

.package-option.selected {
    border-color: var(--primary);
    background: #eff6ff;
}

.package-option input {
    margin-right: 0.625rem;
}

.package-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.package-meta {
    display: block;
    margin-top: 0.25rem;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.75rem 1.25rem;
    border: none;
    border-radius: var(--radius);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.15s, transform 0.1s;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.alert {
    border-radius: var(--radius);
    padding: 0.875rem 1rem;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.alert-error {
    background: var(--danger-bg);
    color: #991b1b;
    border: 1px solid #fecaca;
}

.alert-success {
    background: var(--success-bg);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.api-key-box {
    margin-top: 1rem;
    padding: 1rem;
    background: #0f172a;
    border-radius: var(--radius);
    color: #e2e8f0;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.8125rem;
    word-break: break-all;
    user-select: all;
}

.subscribe-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.75);
}

.subscribe-footer a {
    color: #fff;
    font-weight: 500;
}

.empty-state {
    text-align: center;
    padding: 1rem 0;
    color: var(--text-muted);
}