/* ============================================
   Cron Expression Explainer — Styles
   Theme: Dark, minimalist, utility-focused
   ============================================ */

:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

    --bg: #0c0e14;
    --bg-card: #14171f;
    --bg-input: #0f1218;
    --bg-hover: #1a1e28;

    --border: rgba(255, 255, 255, 0.07);
    --border-hover: rgba(255, 255, 255, 0.14);
    --border-focus: #6c63ff;

    --text: #e8eaf0;
    --text-secondary: #8b90a0;
    --text-muted: #5c6070;

    --accent: #6c63ff;
    --accent-glow: rgba(108, 99, 255, 0.2);
    --accent-light: #8b83ff;
    --green: #34d399;
    --green-dim: rgba(52, 211, 153, 0.12);
    --red: #f87171;
    --yellow: #fbbf24;
    --blue: #60a5fa;

    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 2px 16px rgba(0, 0, 0, 0.4);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: light) {
    :root {
        --bg: #f4f5f7;
        --bg-card: #fff;
        --bg-input: #f0f1f3;
        --bg-hover: #e8eaf0;
        --border: rgba(0, 0, 0, 0.08);
        --border-hover: rgba(0, 0, 0, 0.14);
        --text: #1a1d26;
        --text-secondary: #6b7080;
        --text-muted: #9ba0b0;
        --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
    }
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

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

.app {
    max-width: 640px;
    margin: 0 auto;
    padding: 24px 16px 40px;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 24px;
}

.header-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius);
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    box-shadow: 0 0 20px var(--accent-glow);
}

.header-title {
    font-size: 1.3rem;
    font-weight: 700;
    letter-spacing: -0.02em;
}

.header-sub {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 14px;
    box-shadow: var(--shadow);
    animation: fadeIn 0.35s ease-out;
}

.section-title {
    font-size: 0.88rem;
    font-weight: 600;
    margin-bottom: 14px;
}

/* Input */
.input-row {
    display: flex;
    gap: 10px;
}

.cron-input {
    flex: 1;
    padding: 12px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--text);
    letter-spacing: 0.08em;
    text-align: center;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.cron-input:focus {
    outline: none;
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.cron-input::placeholder {
    color: var(--text-muted);
}

.btn-explain {
    padding: 12px 20px;
    background: linear-gradient(135deg, var(--accent), var(--accent-light));
    border: none;
    border-radius: var(--radius-sm);
    color: #fff;
    font-family: var(--font-sans);
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition);
    box-shadow: 0 2px 12px var(--accent-glow);
    white-space: nowrap;
}

.btn-explain:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.field-labels {
    display: flex;
    justify-content: center;
    gap: 28px;
    margin-top: 8px;
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 600;
}

.error-msg {
    font-size: 0.78rem;
    color: var(--red);
    margin-top: 8px;
    text-align: center;
    display: none;
}

.error-msg.visible {
    display: block;
}

/* Explanation */
.explanation {
    font-size: 1.05rem;
    font-weight: 500;
    color: var(--green);
    text-align: center;
    padding: 8px 0;
    line-height: 1.5;
}

/* Breakdown */
.breakdown-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
}

.breakdown-item {
    text-align: center;
    padding: 12px 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: border-color var(--transition);
}

.breakdown-item:hover {
    border-color: var(--border-hover);
}

.breakdown-value {
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: 600;
    color: var(--accent-light);
    margin-bottom: 4px;
}

.breakdown-label {
    font-size: 0.68rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--text-muted);
    font-weight: 600;
}

.breakdown-desc {
    font-size: 0.72rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* Next Runs */
.next-runs {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    counter-reset: run;
}

.next-runs li {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--text);
    counter-increment: run;
    transition: border-color var(--transition);
}

.next-runs li:hover {
    border-color: var(--border-hover);
}

.next-runs li::before {
    content: counter(run);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--accent-glow);
    color: var(--accent-light);
    font-size: 0.72rem;
    font-weight: 700;
    flex-shrink: 0;
}

.run-relative {
    margin-left: auto;
    font-size: 0.72rem;
    color: var(--text-muted);
    font-family: var(--font-sans);
}

/* Examples */
.examples-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px;
}

.example-btn {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-align: left;
}

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

.example-btn code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--accent-light);
    font-weight: 500;
}

.example-btn span {
    font-size: 0.72rem;
    color: var(--text-secondary);
}

/* Footer */
.footer {
    text-align: center;
    margin-top: 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

@media (max-width: 520px) {
    .app {
        padding: 16px 10px 32px;
    }

    .breakdown-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: 4px;
    }

    .breakdown-item {
        padding: 8px 4px;
    }

    .breakdown-value {
        font-size: 0.85rem;
    }

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

    .field-labels {
        gap: 16px;
        font-size: 0.6rem;
    }

    .cron-input {
        font-size: 0.95rem;
    }
}