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

:root {
    --bg: #0e0e10;
    --surface: #18181b;
    --surface-hover: #1f1f23;
    --border: #27272a;
    --border-subtle: #1f1f23;
    --text: #fafafa;
    --text-muted: #a1a1aa;
    --text-dimmed: #52525b;
    --accent: #a78bfa;
    --accent-dim: #7c3aed;
    --green: #22c55e;
    --amber: #f59e0b;
    --red: #ef4444;
    --radius: 12px;
    --radius-sm: 8px;
    --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'JetBrains Mono', Menlo, Consolas, monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', system-ui, sans-serif;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4), 0 2px 6px rgba(0,0,0,0.3);
    color-scheme: dark;
}

[data-theme="light"] {
    --bg: #f4f4f6;
    --surface: #ffffff;
    --surface-hover: #fafafa;
    --border: #e4e4e7;
    --border-subtle: #f0f0f2;
    --text: #18181b;
    --text-muted: #71717a;
    --text-dimmed: #a1a1aa;
    --accent: #7c3aed;
    --accent-dim: #6d28d9;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1), 0 2px 6px rgba(0,0,0,0.06);
    color-scheme: light;
}

html { height: 100%; }

body {
    font-family: var(--font-sans);
    background: var(--bg);
    color: var(--text);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    transition: background var(--transition), color var(--transition);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ── Header ─────────────────────────────────────────────── */

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 2rem;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 10;
    background: var(--bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: background var(--transition), border-color var(--transition);
}

.brand h1 {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
}
.brand .tld {
    color: var(--accent);
    transition: color var(--transition);
}
.tagline {
    font-size: 0.68rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 500;
    transition: color var(--transition);
}

#theme-toggle {
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.45rem;
    cursor: pointer;
    color: var(--text-muted);
    transition: border-color var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 0;
}
#theme-toggle:hover {
    border-color: var(--accent);
    background: var(--surface);
    color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent);
}
#theme-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

/* Show sun in dark mode (clicking switches to light), moon in light mode */
.icon-moon { display: block; }
.icon-sun  { display: none;  }
[data-theme="light"] .icon-moon { display: none;  }
[data-theme="light"] .icon-sun  { display: block; }

/* ── Main layout ─────────────────────────────────────────── */

main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2.5rem 2rem;
    max-width: 760px;
    width: 100%;
    margin: 0 auto;
}

/* ── Input section ───────────────────────────────────────── */

.input-section { display: flex; flex-direction: column; gap: 1rem; }

.drop-zone {
    position: relative;
    border-radius: var(--radius);
    /* Subtle glow when active */
}

#email-input {
    width: 100%;
    min-height: 300px;
    padding: 1rem 1.25rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.65;
    resize: vertical;
    transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
    tab-size: 2;
}
#email-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 15%, transparent);
}
#email-input::placeholder {
    color: var(--text-dimmed);
    font-style: italic;
}

.drop-overlay {
    position: absolute;
    inset: 0;
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    background: color-mix(in srgb, var(--accent) 10%, var(--bg) 60%);
    border: 2px dashed var(--accent);
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--accent);
    pointer-events: none;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    letter-spacing: 0.02em;
    transition: opacity var(--transition);
}
.drop-zone.dragging .drop-overlay { display: flex; }

.input-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1rem;
}

.hint {
    font-size: 0.72rem;
    color: var(--text-dimmed);
    letter-spacing: 0.02em;
    user-select: none;
}

kbd {
    display: inline-block;
    padding: 0.1em 0.4em;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    line-height: 1.5;
    color: var(--text-muted);
    box-shadow: 0 1px 0 var(--border);
}

#analyze-btn {
    padding: 0.65rem 2rem;
    background: var(--accent);
    color: #fff;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: opacity var(--transition), transform var(--transition), box-shadow var(--transition), background var(--transition);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}
#analyze-btn::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to bottom, rgba(255,255,255,0.08), transparent);
    pointer-events: none;
}
#analyze-btn:hover {
    opacity: 0.92;
    transform: translateY(-1px);
    box-shadow: 0 4px 16px color-mix(in srgb, var(--accent) 45%, transparent);
}
#analyze-btn:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
#analyze-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
#analyze-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* ── Results section ─────────────────────────────────────── */

.results-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.75rem;
    animation: fadeUp 0.45s cubic-bezier(0.4, 0, 0.2, 1) both;
    padding-bottom: 1rem;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Score gauge */

.score-display {
    position: relative;
    width: 200px;
    height: 200px;
}

.gauge {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.25));
}
.gauge-bg {
    fill: none;
    stroke: var(--border);
    stroke-width: 8;
}
.gauge-fill {
    fill: none;
    stroke: var(--green);
    stroke-width: 8;
    stroke-linecap: round;
    stroke-dasharray: 326.73;
    stroke-dashoffset: 326.73;
    transition: stroke-dashoffset 1s cubic-bezier(0.4, 0, 0.2, 1),
                stroke 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.gauge-fill[data-verdict="suspect"] { stroke: var(--amber); }
.gauge-fill[data-verdict="spam"]    { stroke: var(--red); }

.score-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.05em;
}
#score-number {
    font-size: 3rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
    letter-spacing: -0.04em;
    line-height: 1;
    transition: color var(--transition);
}
.score-max {
    font-size: 0.85rem;
    color: var(--text-muted);
    align-self: flex-end;
    margin-bottom: 0.6rem;
    font-weight: 500;
}

/* Verdict badge */

.verdict-badge {
    display: inline-block;
    padding: 0.4rem 1.5rem;
    border-radius: 100px;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    transition: background var(--transition), color var(--transition);
}
.verdict-badge[data-verdict="ham"] {
    background: color-mix(in srgb, var(--green) 14%, transparent);
    color: var(--green);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--green) 25%, transparent);
}
.verdict-badge[data-verdict="suspect"] {
    background: color-mix(in srgb, var(--amber) 14%, transparent);
    color: var(--amber);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--amber) 25%, transparent);
}
.verdict-badge[data-verdict="spam"] {
    background: color-mix(in srgb, var(--red) 14%, transparent);
    color: var(--red);
    box-shadow: 0 0 0 1px color-mix(in srgb, var(--red) 25%, transparent);
}

/* Signals list */

.signals-list {
    width: 100%;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}
.signals-list li {
    display: grid;
    grid-template-columns: 2.8em 11em 1fr;
    align-items: baseline;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.83rem;
    line-height: 1.4;
    transition: border-color var(--transition), background var(--transition), transform var(--transition);
    animation: fadeUp 0.3s cubic-bezier(0.4, 0, 0.2, 1) both;
}
.signals-list li:hover {
    border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
    background: var(--surface-hover);
    transform: translateX(2px);
}
.signal-weight {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.78rem;
    text-align: right;
    color: var(--accent);
    letter-spacing: -0.02em;
}
.signal-rule {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: lowercase;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.signal-detail {
    color: var(--text);
    font-size: 0.82rem;
}

/* ── Footer ──────────────────────────────────────────────── */

footer {
    text-align: center;
    padding: 1.25rem 2rem;
    border-top: 1px solid var(--border);
    font-size: 0.7rem;
    color: var(--text-dimmed);
    letter-spacing: 0.06em;
    transition: border-color var(--transition), color var(--transition);
}

/* ── Responsive ──────────────────────────────────────────── */

@media (max-width: 600px) {
    header { padding: 1rem 1.25rem; }

    main {
        padding: 1.25rem 1rem;
        gap: 1.5rem;
    }

    #email-input {
        min-height: 240px;
        font-size: 0.73rem;
    }

    .hint { display: none; }

    .score-display { width: 160px; height: 160px; }
    #score-number  { font-size: 2.4rem; }

    .signals-list li {
        grid-template-columns: 2.5em 1fr;
    }
    .signal-rule { display: none; }
}

@media (max-width: 380px) {
    .brand h1 { font-size: 1.2rem; }
    .tagline   { display: none; }
}