/* ============================================
   Font Flow — Styles
   Theme: Dark mode, glassmorphism, modern
   ============================================ */

:root {
    --bg-base: #09090b;
    --bg-surface: #18181b;
    --bg-surface-hover: #27272a;
    --border: #27272a;
    --border-active: #3f3f46;
    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #8b5cf6;
    --radius: 12px;
    --font-ui: 'Inter', system-ui, sans-serif;
    --transition: 0.2s ease;
    --overlay-bg: rgba(9, 9, 11, 0.85);
}

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

body {
    font-family: var(--font-ui);
    background-color: var(--bg-base);
    color: var(--text-main);
    min-height: 100vh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    overflow-y: scroll;
}

/* --- Layout --- */
.app-layout {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* --- Utilities --- */
.icon {
    width: 18px;
    height: 18px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.blur-backdrop {
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    color: var(--text-main);
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition);
    font-family: var(--font-ui);
}

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

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

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

.btn-icon {
    padding: 0.5rem;
}

.badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 0.1rem 0.4rem;
    border-radius: 99px;
    font-size: 0.75rem;
    font-weight: 700;
}

/* --- Header & Toolbar --- */
.header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: rgba(9, 9, 11, 0.8);
    border-bottom: 1px solid var(--border);
    padding: 1rem 1.5rem;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    margin-bottom: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-mark {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1rem;
    color: #fff;
}

.logo h1 {
    font-size: 1.125rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.global-preview-input {
    flex: 1;
    max-width: 600px;
}

.global-preview-input input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 99px;
    color: var(--text-main);
    font-size: 1rem;
    font-family: var(--font-ui);
    transition: var(--transition);
}

.global-preview-input input:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--bg-base);
}

.toolbar {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.search-box {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 0 0.75rem;
}

.search-box .icon {
    color: var(--text-muted);
}

.search-box input {
    background: transparent;
    border: none;
    color: var(--text-main);
    padding: 0.5rem 0;
    width: 160px;
    font-family: var(--font-ui);
    font-size: 0.875rem;
}

.search-box input:focus {
    outline: none;
}

.filters {
    display: flex;
    gap: 0.25rem;
    background: var(--bg-surface);
    padding: 0.25rem;
    border-radius: 8px;
    border: 1px solid var(--border);
}

.filter-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-ui);
}

.filter-btn:hover {
    color: var(--text-main);
}

.filter-btn.active {
    background: var(--border);
    color: var(--text-main);
}

.controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-left: auto;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.control-group label {
    font-size: 0.875rem;
    color: var(--text-muted);
    min-width: 80px;
}

.control-group span {
    color: var(--text-main);
    font-variant-numeric: tabular-nums;
}

.slider {
    -webkit-appearance: none;
    width: 120px;
    height: 4px;
    background: var(--border);
    border-radius: 2px;
    outline: none;
}

.slider::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    transition: transform 0.1s;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* --- Font Grid --- */
.main-content {
    padding: 2rem 1.5rem;
    flex: 1;
}

.font-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 1.5rem;
}

/* --- Font Card --- */
.font-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.font-card:hover {
    border-color: var(--border-active);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
    transform: translateY(-2px);
}

.font-card.pinned {
    border-color: var(--primary);
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1.5rem;
}

.card-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.card-title {
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
}

.card-title:hover {
    color: var(--primary);
    text-decoration: underline;
}

.card-category {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-actions {
    display: flex;
    gap: 0.25rem;
}

.card-preview {
    flex: 1;
    overflow: hidden;
    display: flex;
    align-items: center;
    min-height: 120px;
}

.preview-text {
    width: 100%;
    word-wrap: break-word;
    line-height: 1.3;
    transition: font-size 0.2s, font-weight 0.2s;
    /* Will dynamically receive font-family */
}

/* --- Comparison Overlay --- */
.compare-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-base);
    z-index: 100;
    display: flex;
    flex-direction: column;
    transform: translateY(100%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.compare-overlay.open {
    transform: translateY(0);
}

.compare-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.compare-controls {
    padding: 1.5rem;
    display: flex;
    gap: 2rem;
    background: var(--bg-surface);
    border-bottom: 1px solid var(--border);
}

.compare-grid {
    flex: 1;
    padding: 1.5rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 1.5rem;
    overflow-y: auto;
}

.compare-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
}

.compare-card .preview-text {
    margin-top: 1.5rem;
    flex: 1;
}

.empty-state {
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    font-size: 1.125rem;
    height: 100%;
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-main);
    color: var(--bg-base);
    padding: 0.75rem 1.5rem;
    border-radius: 99px;
    font-weight: 600;
    font-size: 0.875rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: 200;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

/* --- Responsive --- */
@media (max-width: 900px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
        gap: 1rem;
    }

    .toolbar {
        flex-wrap: wrap;
        flex-direction: column;
        align-items: stretch;
    }

    .controls {
        margin-left: 0;
        flex-direction: column;
        align-items: stretch;
    }

    .font-grid {
        grid-template-columns: 1fr;
    }
}