/* =========================================================
   Data Convo — Modern Developer Platform Design System
   Dark-mode minimalism, glassmorphism, sharp typography,
   micro-animations, and a consistent component language.
   ========================================================= */

/* ── CSS Variables ─────────────────────────────────────── */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #111118;
    --bg-tertiary: #16161f;

    --surface: rgba(255, 255, 255, 0.035);
    --surface-hover: rgba(255, 255, 255, 0.06);
    --surface-active: rgba(255, 255, 255, 0.09);

    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.14);

    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.35);
    --accent-secondary: #8b5cf6;

    --success: #10b981;
    --success-hover: #34d399;
    --error: #ef4444;
    --warning: #f59e0b;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --text-inverse: #0a0a0f;

    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Andale Mono', monospace;

    /* Design tokens: font hierarchy */
    --font-hero: 800 clamp(48px, 6vw, 60px) / 1.1 var(--font-sans);
    --font-h2: 700 clamp(28px, 4vw, 36px) / 1.2 var(--font-sans);
    --font-h3: 600 clamp(18px, 2vw, 20px) / 1.3 var(--font-sans);
    --font-body: 400 clamp(14px, 1.5vw, 16px) / 1.5 var(--font-sans);
    --font-label: 500 14px / 1.5 var(--font-sans);
    --font-badge: 600 12px / 1 var(--font-sans);
    --font-code: 500 13px / 1.6 var(--font-mono);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.28);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.36);
    --shadow-glow: 0 0 24px var(--accent-glow);

    --transition-fast: 0.15s ease;
    --transition-base: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ── Base & Reset ──────────────────────────────────────── */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-sans);
    background: radial-gradient(ellipse at 0% 0%, rgba(99, 102, 241, 0.12) 0%, transparent 50%),
                radial-gradient(ellipse at 100% 100%, rgba(139, 92, 246, 0.10) 0%, transparent 50%),
                var(--bg-primary);
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    animation: fadeIn 0.5s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ── Typography ────────────────────────────────────────── */
h1, h2, h3, h4, h5, h6 {
    margin: 0 0 0.6em 0;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

h1 { font: var(--font-hero); }
h2 { font: var(--font-h2); }
h3 { font: var(--font-h3); }

p {
    margin: 0 0 1em 0;
    color: var(--text-secondary);
    font: var(--font-body);
}

a {
    color: var(--accent-hover);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--text-primary);
    text-decoration: underline;
}

small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* ── Layout Containers ─────────────────────────────────── */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 40px 24px;
    animation: slideUp 0.5s ease-out;
}

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

.card {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: 32px;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-lg);
}

.card-header {
    margin: -32px -32px 24px -32px;
    padding: 24px 32px;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid var(--border);
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

/* ── Forms ─────────────────────────────────────────────── */
.form-group {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    font: var(--font-label);
    color: var(--text-secondary);
    letter-spacing: 0.01em;
}

input[type="text"],
input[type="password"],
input[type="email"],
select,
textarea {
    width: 100%;
    padding: 12px 14px;
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font: var(--font-body);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
    color: var(--text-muted);
}

input:focus,
select:focus,
textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-glow);
    background: rgba(0, 0, 0, 0.35);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 38px;
}

select option {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

textarea {
    resize: vertical;
    min-height: 80px;
}

/* ── Buttons ───────────────────────────────────────────── */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font: var(--font-label);
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast), filter var(--transition-fast);
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.25);
}

button:hover,
.btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px var(--accent-glow);
    filter: brightness(1.1);
}

button:active,
.btn:active {
    transform: translateY(0);
}

.btn-secondary {
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text-primary);
    box-shadow: none;
}

.btn-secondary:hover {
    background: var(--surface-hover);
    border-color: var(--border-strong);
    box-shadow: none;
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    box-shadow: 0 4px 14px rgba(16, 185, 129, 0.25);
}

.btn-success:hover {
    box-shadow: 0 6px 20px rgba(16, 185, 129, 0.35);
}

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--error);
    box-shadow: none;
}

.btn-danger:hover {
    background: rgba(239, 68, 68, 0.25);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.2);
}

.btn-sm {
    padding: 8px 14px;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
}

/* ── Tables ────────────────────────────────────────────── */
table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin-top: 16px;
    border-radius: var(--radius-md);
    /* overflow: clip preserves rounded-corner clipping WITHOUT creating
       a scroll container that would break position:sticky on <th>. */
    overflow: clip;
    border: 1px solid var(--border);
}

th, td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    font: var(--font-body);
}

th {
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-primary);
    font: var(--font-badge);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

tbody tr {
    background: transparent;
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: var(--surface-hover);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* ── Code & Pre ────────────────────────────────────────── */
code, pre {
    font: var(--font-code);
}

code {
    background: rgba(255, 255, 255, 0.06);
    color: var(--accent-hover);
    padding: 2px 6px;
    border-radius: 4px;
}

pre {
    background: rgba(0, 0, 0, 0.35);
    color: var(--text-primary);
    padding: 16px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    white-space: pre-wrap;
    word-wrap: break-word;
    overflow-x: auto;
}

/* ── Utility Classes ───────────────────────────────────── */
.error {
    color: var(--error);
    font: var(--font-label);
    font-weight: 600;
    padding: 12px 16px;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}

.no-results {
    color: var(--text-muted);
    font-style: italic;
}

.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-primary { color: var(--text-primary); }

.glass {
    background: var(--surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
}

/* ── Animations ────────────────────────────────────────── */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.shimmer {
    background: linear-gradient(90deg, var(--surface) 25%, var(--surface-hover) 50%, var(--surface) 75%);
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
}

/* ── Scrollbar ─────────────────────────────────────────── */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: rgba(255, 255, 255, 0.02);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.12);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ── Selection ─────────────────────────────────────────── */
::selection {
    background: var(--accent);
    color: white;
}
/* ========= Mobile responsiveness (added) ========= */
@media (max-width: 768px) {
  .pricing-grid, .dashboard-grid, .stats-grid, .grid-3, .grid-2 { grid-template-columns: 1fr !important; }
  .pricing-card, .dashboard-card, .stat-card, .card { width: 100% !important; max-width: 100% !important; }
  .pricing-nav, .nav-links, .navbar, nav { flex-direction: column; align-items: stretch; gap: 10px; }
  .container, .pricing-page, .main-container, .main-content, .content { padding-left: 16px; padding-right: 16px; }
  table { display: block; overflow-x: auto; white-space: nowrap; }
  .flex-row, .row, .btn-group, .toolbar { flex-direction: column; align-items: stretch; }
  input, select, textarea, button { max-width: 100%; }
  h1 { font-size: 1.6rem !important; } h2 { font-size: 1.25rem !important; }
  .auth-shell, .auth-card { max-width: 100%; padding: 24px 18px; }
};