/* ============================================
   Responsive Font Scale Calculator — Styles
   Modern gradient palette with glassmorphism
   ============================================ */

:root {
    --primary: #8B5CF6;
    --primary-light: #A78BFA;
    --accent: #06B6D4;
    --accent-light: #22D3EE;
    --bg: #0C0A14;
    --bg-elevated: #16132A;
    --bg-card: rgba(22, 19, 42, 0.75);
    --surface: #1E1B38;
    --surface-hover: #2A2650;
    --text: #F1F5F9;
    --text-secondary: #A5B0C5;
    --text-muted: #6B7590;
    --border: rgba(139, 92, 246, 0.1);
    --border-hover: rgba(139, 92, 246, 0.25);
    --success: #22C55E;
    --danger: #EF4444;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --transition: 0.2s ease;
    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

[data-theme="light"] {
    --bg: #F5F3FF;
    --bg-elevated: #FFFFFF;
    --bg-card: rgba(255, 255, 255, 0.8);
    --surface: #EDE9FE;
    --surface-hover: #DDD6FE;
    --text: #1E1533;
    --text-secondary: #5B4F80;
    --text-muted: #8B80A8;
    --border: rgba(0, 0, 0, 0.08);
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 1.5rem;
    transition: border-color var(--transition);
}

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

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(12, 10, 20, 0.88);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border);
}

[data-theme="light"] .header {
    background: rgba(245, 243, 255, 0.88);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.625rem 1.5rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.625rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo h1 {
    font-size: 1.15rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    color: #fff;
    box-shadow: 0 2px 8px rgba(139, 92, 246, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 4px 16px rgba(139, 92, 246, 0.5);
    transform: translateY(-1px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    color: #0C0A14;
}

.btn-accent:hover {
    transform: translateY(-1px);
}

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem;
}

.btn-ghost:hover {
    background: var(--surface);
    color: var(--text);
}

.btn-sm {
    font-size: 0.8rem;
    padding: 0.375rem 0.75rem;
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* Layout */
.main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem;
}

.layout {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 1.5rem;
    align-items: start;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

/* Controls */
.controls {
    position: sticky;
    top: 70px;
}

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

.form-group label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0.375rem;
}

.form-group input[type="number"],
.form-group select {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-family: var(--font);
    font-size: 0.85rem;
    transition: border-color var(--transition);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.15);
}

.form-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    background: var(--surface);
    border-radius: 3px;
    outline: none;
}

.form-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
}

.form-group span {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 600;
}

.radio-group {
    display: flex;
    gap: 1rem;
    margin-top: 0.25rem;
}

.radio-group label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
    text-transform: none;
    font-weight: 400;
}

.radio-group input {
    accent-color: var(--primary);
}

/* Scale Table */
.table-scroll {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

th,
td {
    padding: 0.625rem 0.75rem;
    text-align: left;
    font-size: 0.8rem;
    border-bottom: 1px solid var(--border);
}

th {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    font-weight: 600;
}

td {
    color: var(--text-secondary);
}

td:first-child {
    font-weight: 600;
    color: var(--primary-light);
}

td:last-child {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.75rem;
    color: var(--accent);
    word-break: break-all;
}

tr:hover td {
    background: rgba(139, 92, 246, 0.05);
}

/* Preview */
.preview-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.viewport-control {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.viewport-control input[type="range"] {
    width: 200px;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--surface);
    border-radius: 2px;
}

.viewport-control input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary);
    border-radius: 50%;
    cursor: pointer;
}

.preview-frame {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background: var(--surface);
    border-radius: var(--radius-sm);
    min-height: 200px;
    overflow: hidden;
}

.preview-line {
    transition: font-size 0.3s ease;
    line-height: 1.3;
}

.preview-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: 0.125rem;
    letter-spacing: 0.05em;
}

/* CSS Output */
.css-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.75rem;
}

.css-output pre {
    padding: 1rem;
    background: var(--surface);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    font-size: 0.8rem;
    line-height: 1.6;
    font-family: 'JetBrains Mono', monospace;
    color: var(--accent);
    max-height: 400px;
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 1000;
}

.toast {
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    font-size: 0.85rem;
    animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.7s forwards;
}

.toast.success {
    border-left: 3px solid var(--success);
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 1.5rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 2rem;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100px);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeOut {
    from {
        opacity: 1;
    }

    to {
        opacity: 0;
    }
}

@media (max-width: 800px) {
    .layout {
        grid-template-columns: 1fr;
    }

    .controls {
        position: static;
    }

    .viewport-control input[type="range"] {
        width: 140px;
    }
}