/* ========================================
   Semver Calculator — Premium Dark Theme
   ======================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
    --primary: #10B981;
    --primary-glow: rgba(16, 185, 129, 0.2);
    --accent: #6366F1;
    --accent-glow: rgba(99, 102, 241, 0.2);
    --danger: #EF4444;
    --danger-glow: rgba(239, 68, 68, 0.15);
    --warning: #F59E0B;
    --warning-glow: rgba(245, 158, 11, 0.15);

    --bg-deep: #0F172A;
    --bg-base: #1E293B;
    --bg-surface: #334155;
    --bg-elevated: #475569;

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;

    --border: rgba(51, 65, 85, 0.6);

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 14px;

    --font-sans: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    --transition: 200ms ease;
}

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

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

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

.app {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 16px 60px;
}

.header {
    display: flex;
    align-items: center;
    padding: 18px 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.1rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: 0 2px 8px var(--primary-glow);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.82rem;
    font-weight: 500;
    border: 1px solid var(--border);
    background: var(--bg-surface);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition);
}

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

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

.btn-primary:hover {
    background: #059669;
}

.card {
    background: var(--bg-base);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
    animation: fadeIn 0.4s ease-out;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.input-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-muted);
    margin-bottom: 5px;
}

.version-input {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font-mono);
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition);
}

.version-input:focus {
    border-color: var(--primary);
}

.version-input.invalid {
    border-color: var(--danger);
}

/* Compare */
.compare-row {
    display: flex;
    align-items: end;
    gap: 12px;
    margin-bottom: 14px;
}

.version-input-group {
    flex: 1;
}

.compare-arrow {
    font-size: 1.4rem;
    color: var(--text-muted);
    padding-bottom: 8px;
}

.compare-actions {
    display: flex;
    gap: 8px;
}

/* Diff Visual */
.diff-visual {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.ver-block {
    display: flex;
    align-items: center;
    gap: 4px;
}

.ver-segment {
    font-family: var(--font-mono);
    font-size: 1.6rem;
    font-weight: 700;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    background: var(--bg-surface);
}

.ver-dot {
    font-size: 1.4rem;
    color: var(--text-muted);
}

.seg-unchanged {
    color: var(--text-secondary);
}

.seg-changed {
    color: var(--danger);
    background: var(--danger-glow);
}

.seg-bumped {
    color: var(--primary);
    background: var(--primary-glow);
}

.diff-explanation {
    padding: 14px;
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

.diff-explanation strong {
    color: var(--text-primary);
}

.change-type {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 10px;
    font-size: 0.72rem;
    font-weight: 600;
    margin-right: 6px;
}

.change-major {
    background: var(--danger-glow);
    color: var(--danger);
}

.change-minor {
    background: var(--warning-glow);
    color: var(--warning);
}

.change-patch {
    background: var(--primary-glow);
    color: var(--primary);
}

.change-equal {
    background: rgba(100, 116, 139, 0.2);
    color: var(--text-muted);
}

/* Bump */
.bump-row {
    margin-bottom: 14px;
    max-width: 300px;
}

.bump-results {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}

.bump-card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 14px;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition);
}

.bump-card:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.bump-label {
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.bump-version {
    font-family: var(--font-mono);
    font-size: 1.1rem;
    font-weight: 700;
}

.bump-card.major .bump-version {
    color: var(--danger);
}

.bump-card.minor .bump-version {
    color: var(--warning);
}

.bump-card.patch .bump-version {
    color: var(--primary);
}

/* Range */
.range-row {
    display: flex;
    align-items: end;
    gap: 10px;
    margin-bottom: 14px;
    flex-wrap: wrap;
}

.range-row .version-input-group {
    flex: 1;
    min-width: 140px;
}

.range-row .btn {
    margin-bottom: 0;
    align-self: end;
}

.range-result {
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
}

.range-pass {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid rgba(16, 185, 129, 0.3);
}

.range-fail {
    background: var(--danger-glow);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* History */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    background: var(--bg-surface);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: background var(--transition);
}

.history-item:hover {
    background: var(--bg-elevated);
}

/* Toast */
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 2000;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.toast {
    padding: 10px 14px;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.82rem;
    color: var(--text-primary);
    animation: toast-in 0.3s ease-out;
}

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

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

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

@keyframes toast-in {
    from {
        opacity: 0;
        transform: translateX(30px);
    }

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

@media (max-width: 600px) {
    .compare-row {
        flex-direction: column;
    }

    .compare-arrow {
        text-align: center;
        transform: rotate(90deg);
    }

    .bump-results {
        grid-template-columns: 1fr;
    }

    .range-row {
        flex-direction: column;
    }
}