/* === Theme Variables === */
:root {
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Inter', -apple-system, sans-serif;
    --radius: 10px;
    --radius-sm: 6px;
    --transition: 0.2s ease;
    --max-width: 780px;
}

[data-theme="dark"] {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-input: #242836;
    --bg-hover: #2a2e3d;
    --border: #2d3248;
    --text: #e8eaed;
    --text-muted: #8b8fa3;
    --accent: #6c5ce7;
    --accent-hover: #7c6ff7;
    --accent-glow: rgba(108, 92, 231, 0.15);
    --success: #00cec9;
    --expression-bg: #1a1d27;
    --expression-text: #a29bfe;
    --preset-bg: #1e2230;
    --preset-hover: #262b3d;
}

[data-theme="light"] {
    --bg: #f5f6fa;
    --bg-card: #ffffff;
    --bg-input: #f0f1f5;
    --bg-hover: #e8e9ed;
    --border: #dcdde1;
    --text: #2d3436;
    --text-muted: #636e72;
    --accent: #6c5ce7;
    --accent-hover: #5a4bd1;
    --accent-glow: rgba(108, 92, 231, 0.1);
    --success: #00b894;
    --expression-bg: #ffffff;
    --expression-text: #6c5ce7;
    --preset-bg: #f0f1f5;
    --preset-hover: #e4e5ea;
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    transition: background var(--transition), color var(--transition);
}

/* === Header === */
header {
    text-align: center;
    padding: 2.5rem 1rem 1rem;
}

.header-row {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    max-width: var(--max-width);
    margin: 0 auto;
    position: relative;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
}

.logo span { letter-spacing: -0.02em; }

.header-actions {
    position: absolute;
    right: 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hookdebug-link {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.35rem 0.7rem;
    border-radius: var(--radius-sm);
    background: var(--bg-input);
    transition: all var(--transition);
    white-space: nowrap;
}

.hookdebug-link:hover {
    color: var(--text);
    background: var(--bg-hover);
}

#theme-toggle {
    background: var(--bg-input);
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: background var(--transition);
}

#theme-toggle:hover { background: var(--bg-hover); }

.tagline {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-top: 0.5rem;
}

/* === Main === */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem 3rem;
}

section { margin-top: 2rem; }
h2 { font-size: 1rem; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-bottom: 0.75rem; }

/* === Expression Display === */
.expression-section { text-align: center; margin-top: 1.5rem; }

.expression-display {
    background: var(--expression-bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 0.25rem;
    box-shadow: 0 0 30px var(--accent-glow);
    transition: border-color var(--transition);
}

.expression-display:focus-within { border-color: var(--accent); }

#cron-input {
    width: 100%;
    background: transparent;
    border: none;
    font-family: var(--font-mono);
    font-size: 2.4rem;
    font-weight: 700;
    color: var(--expression-text);
    text-align: center;
    padding: 0.75rem;
    outline: none;
    letter-spacing: 0.05em;
}

.expression-actions {
    margin-top: 0.75rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.75rem;
}

.btn {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 600;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition);
}

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

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

.copy-feedback {
    font-size: 0.85rem;
    color: var(--success);
    opacity: 0;
    transition: opacity 0.3s;
}

.copy-feedback.show { opacity: 1; }

.human-readable {
    margin-top: 0.75rem;
    font-size: 1.1rem;
    color: var(--text-muted);
    font-style: italic;
}

/* === Mode Toggle === */
.mode-section { text-align: center; }

.mode-toggle {
    display: inline-flex;
    background: var(--bg-input);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.mode-btn {
    font-family: var(--font-sans);
    font-size: 0.8rem;
    font-weight: 500;
    padding: 0.45rem 1rem;
    border: none;
    background: transparent;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.mode-btn.active {
    background: var(--accent);
    color: #fff;
}

/* === Presets === */
.presets-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.5rem;
}

.preset-btn {
    font-family: var(--font-sans);
    background: var(--preset-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.6rem 0.75rem;
    cursor: pointer;
    text-align: left;
    transition: all var(--transition);
    color: var(--text);
}

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

.preset-btn .preset-expr {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--expression-text);
    display: block;
}

.preset-btn .preset-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.15rem;
    display: block;
}

/* === Builder === */
.field-grid {
    display: grid;
    gap: 0.75rem;
}

.field-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1rem;
    transition: border-color var(--transition);
}

.field-card:focus-within { border-color: var(--accent); }

.field-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.field-name {
    font-weight: 600;
    font-size: 0.9rem;
}

.field-value {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--expression-text);
    background: var(--bg-input);
    padding: 0.2rem 0.5rem;
    border-radius: var(--radius-sm);
}

.field-type-select {
    width: 100%;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    padding: 0.4rem 0.5rem;
    background: var(--bg-input);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    margin-bottom: 0.5rem;
    cursor: pointer;
}

.field-type-select:focus { border-color: var(--accent); }

.field-options {
    margin-top: 0.5rem;
}

.field-options input, .field-options select {
    font-family: var(--font-sans);
    font-size: 0.85rem;
    padding: 0.35rem 0.5rem;
    background: var(--bg-input);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    width: auto;
}

.field-options input:focus, .field-options select:focus { border-color: var(--accent); }

.field-options label {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-right: 0.5rem;
}

.inline-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* === Executions === */
.executions-list {
    list-style: none;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.executions-list li {
    padding: 0.55rem 1rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
}

.executions-list li:last-child { border-bottom: none; }
.executions-list li .exec-relative { color: var(--text-muted); font-family: var(--font-sans); font-size: 0.8rem; }

.exec-error {
    padding: 1rem;
    color: var(--text-muted);
    font-style: italic;
    text-align: center;
}

/* === Cheat Sheet === */
.cheat-sheet {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.25rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.cheat-sheet table { width: 100%; border-collapse: collapse; font-size: 0.85rem; }
.cheat-sheet th, .cheat-sheet td { padding: 0.35rem 0.5rem; text-align: left; border-bottom: 1px solid var(--border); }
.cheat-sheet th { color: var(--text-muted); font-weight: 600; font-size: 0.75rem; text-transform: uppercase; }
.cheat-sheet h3 { font-size: 0.85rem; margin-bottom: 0.5rem; }
.cheat-sheet code { font-family: var(--font-mono); color: var(--expression-text); font-size: 0.85rem; }
.examples { line-height: 2; }

/* === Footer === */
footer {
    text-align: center;
    padding: 2rem 1rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    max-width: var(--max-width);
    margin: 0 auto;
}

footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }

/* === Responsive === */
@media (max-width: 600px) {
    #cron-input { font-size: 1.6rem; }
    .cheat-sheet { grid-template-columns: 1fr; }
    .presets-grid { grid-template-columns: 1fr; }
    .header-actions { position: static; }
    .header-row { flex-wrap: wrap; justify-content: center; }
}