* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    height: 100%;
}

:root {
    --bg-canvas: #e6e2db;
    --bg-wash: #cfd8d4;
    --bg-primary: #e6e2db;
    --bg-secondary: #f7f5f1;
    --text-primary: #1f2322;
    --text-secondary: #5c615e;
    --border-color: #d4cfc6;
    --accent-color: #3d5c57;
    --accent-soft: rgba(61, 92, 87, 0.12);
    --shadow: rgba(31, 35, 34, 0.08);
    --weak: #b42318;
    --fair: #b54708;
    --strong: #32724c;
    --very-strong: #3d5c57;
    --control-radius: 8px;
    --panel-radius: 12px;
}

[data-theme="dark"] {
    --bg-canvas: #161918;
    --bg-wash: #1e2a27;
    --bg-primary: #161918;
    --bg-secondary: #1e2221;
    --text-primary: #eceae6;
    --text-secondary: #a8ada9;
    --border-color: #323836;
    --accent-color: #8fb3ac;
    --accent-soft: rgba(143, 179, 172, 0.14);
    --shadow: rgba(0, 0, 0, 0.35);
    --weak: #f97066;
    --fair: #f79009;
    --strong: #75b798;
    --very-strong: #8fb3ac;
}

body {
    font-family: 'Geist', 'Segoe UI', sans-serif;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    background-color: var(--bg-canvas);
    background-image: radial-gradient(ellipse 90% 42% at 50% -8%, var(--bg-wash), transparent 70%);
    color: var(--text-primary);
    padding: max(88px, calc(env(safe-area-inset-top) + 72px)) max(20px, env(safe-area-inset-right)) max(32px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left));
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

body.modal-open {
    overflow: hidden;
}

[hidden] {
    display: none !important;
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.top-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-height: 56px;
    padding: max(10px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) 10px max(16px, env(safe-area-inset-left));
    background: color-mix(in srgb, var(--bg-canvas) 88%, transparent);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
}

.top-bar-links {
    display: flex;
    align-items: center;
    gap: 16px;
}

.top-bar-links a {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
}

.top-bar-links a:hover {
    color: var(--accent-color);
}

.theme-toggle {
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    padding: 7px 12px;
    cursor: pointer;
}

.theme-toggle:hover,
.copy-btn:hover,
.icon-btn:hover {
    border-color: var(--accent-color);
}

.theme-toggle {
    width: 36px;
    height: 36px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.theme-toggle svg {
    width: 18px;
    height: 18px;
    color: var(--text-primary);
}

.theme-toggle .sun-icon {
    display: block;
}

.theme-toggle .moon-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

.container {
    width: 100%;
    max-width: 580px;
    padding: 32px;
    background: var(--bg-secondary);
    border-radius: var(--panel-radius);
    border: 1px solid var(--border-color);
    box-shadow: 0 1px 2px var(--shadow);
    position: relative;
    z-index: 1;
    margin: 0 auto 24px;
}

.page-header {
    margin-bottom: 28px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 28px;
    letter-spacing: -0.03em;
    line-height: 1.2;
}

.lede {
    margin-top: 8px;
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.5;
}

.result-section {
    margin-bottom: 24px;
}

.result-label,
.length-label,
.settings-label {
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 10px;
    display: block;
}

.result-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

#result {
    width: 100%;
    padding: 14px 52px 14px 14px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    background: var(--bg-canvas);
    color: var(--text-primary);
    font-family: ui-monospace, 'Cascadia Code', 'Courier New', monospace;
    font-weight: 600;
    outline: none;
    letter-spacing: 0.02em;
    appearance: none;
    overflow: hidden;
    text-overflow: ellipsis;
}

#result:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

#result::placeholder {
    color: var(--text-secondary);
    font-weight: 400;
}

#crackInput,
#cmpA,
#cmpB {
    width: 100%;
    padding: 14px 52px 14px 14px;
    font-size: 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    background: var(--bg-canvas);
    color: var(--text-primary);
    font-family: ui-monospace, 'Cascadia Code', 'Courier New', monospace;
    font-weight: 600;
    outline: none;
    letter-spacing: 0.02em;
    appearance: none;
    overflow: hidden;
    text-overflow: ellipsis;
}

#crackInput:focus,
#cmpA:focus,
#cmpB:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px var(--accent-soft);
}

#crackInput::placeholder,
#cmpA::placeholder,
#cmpB::placeholder {
    color: var(--text-secondary);
    font-weight: 400;
}

.copy-btn {
    position: absolute;
    right: 6px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--accent-color);
}

.copy-btn:active {
    background: var(--bg-canvas);
}

.copy-btn svg {
    width: 18px;
    height: 18px;
}

.strength {
    margin-top: 10px;
}

.strength-bar {
    height: 4px;
    border-radius: 999px;
    background: var(--border-color);
    overflow: hidden;
}

.strength-fill {
    display: block;
    height: 100%;
    width: 0;
    border-radius: inherit;
    background: var(--weak);
}

.strength[data-level="fair"] .strength-fill {
    background: var(--fair);
}

.strength[data-level="strong"] .strength-fill {
    background: var(--strong);
}

.strength[data-level="very-strong"] .strength-fill {
    background: var(--very-strong);
}

.strength-label {
    margin-top: 6px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

.strength-note {
    margin-top: 5px;
    font-size: 11px;
    line-height: 1.4;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* ── Tabs ──────────────────────────────────────────────────────────────── */
.tabs {
    display: flex;
    gap: 3px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    padding: 3px;
    margin-bottom: 24px;
    overflow-x: auto;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
}

.tabs::-webkit-scrollbar {
    display: none;
}

.tab {
    flex: 0 0 auto;
    font-family: inherit;
    font-size: 12.5px;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: 6px;
    padding: 7px 14px;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
    white-space: nowrap;
}

.tab:hover {
    color: var(--text-primary);
}

.tab.active {
    background: var(--bg-secondary);
    color: var(--accent-color);
    box-shadow: 0 1px 2px var(--shadow);
}

/* ── Separator / radio group ─────────────────────────────────────────────── */
.separator-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.sep-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    cursor: pointer;
    color: var(--text-primary);
    font-size: 13px;
    font-weight: 500;
    font-family: ui-monospace, 'Cascadia Code', 'Courier New', monospace;
}

.sep-item:hover,
.sep-item:focus-within {
    border-color: var(--accent-color);
}

.sep-item input[type="radio"] {
    accent-color: var(--accent-color);
    flex-shrink: 0;
    width: 15px;
    height: 15px;
    cursor: pointer;
}

.length-section,
.settings-section {
    margin-bottom: 24px;
}

.length-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.length-value {
    font-size: 14px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    min-width: 2ch;
    text-align: right;
    color: var(--accent-color);
}

#length {
    width: 100%;
    height: 6px;
    border-radius: 999px;
    background: var(--border-color);
    outline: none;
    appearance: none;
    cursor: pointer;
}

#length::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: 2px solid var(--bg-secondary);
}

#length::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    border: 2px solid var(--bg-secondary);
}

.checkbox-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
    cursor: pointer;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
}

.checkbox-item:hover,
.checkbox-item:focus-within {
    border-color: var(--accent-color);
}

.checkbox-item input[type="checkbox"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--accent-color);
    flex-shrink: 0;
}

.generate-btn {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 600;
    color: #f7f5f1;
    background: var(--accent-color);
    border: 1px solid var(--accent-color);
    border-radius: var(--control-radius);
    cursor: pointer;
    font-family: inherit;
}

[data-theme="dark"] .generate-btn {
    color: #161918;
}

.generate-btn:hover {
    opacity: 0.92;
}

.generate-btn:active {
    opacity: 0.86;
}

.generate-btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
}


.toast {
    position: fixed;
    bottom: max(24px, env(safe-area-inset-bottom, 24px));
    left: 50%;
    transform: translateX(-50%) translateY(16px);
    background: var(--bg-secondary);
    color: var(--text-primary);
    padding: 10px 16px;
    border-radius: var(--control-radius);
    font-weight: 600;
    font-size: 14px;
    box-shadow: 0 8px 24px var(--shadow);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1000;
    border: 1px solid var(--border-color);
    max-width: calc(100vw - 40px);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ── Compare ──────────────────────────────────────────────────────────────── */
.compare-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.compare-row {
    display: flex;
    flex-direction: column;
    gap: 0;
}

.compare-row .result-label {
    margin-bottom: 8px;
}

.compare-verdict {
    margin-top: 4px;
    padding: 12px 14px;
    border-radius: var(--control-radius);
    font-size: 14px;
    font-weight: 600;
    border: 1px solid var(--border-color);
    background: var(--bg-canvas);
    color: var(--text-primary);
}

.compare-verdict[data-winner="a"],
.compare-verdict[data-winner="b"] {
    border-color: var(--strong);
    color: var(--strong);
    background: transparent;
}

.compare-verdict[data-winner="tie"] {
    border-color: var(--fair);
    color: var(--fair);
    background: transparent;
}

.not-found-page {
    align-items: center;
    min-height: 100vh;
    padding: 32px 20px;
}

.not-found {
    width: 100%;
    max-width: 420px;
    text-align: center;
    padding: 40px 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--panel-radius);
}

.not-found-code {
    font-size: 13px;
    font-weight: 700;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 10px;
}

.not-found h1 {
    font-size: 28px;
}

.not-found-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-top: 24px;
    text-decoration: none;
    width: auto;
    min-width: 180px;
}

@media (max-width: 600px) {
    body {
        padding: max(76px, calc(env(safe-area-inset-top) + 60px)) max(14px, env(safe-area-inset-right)) max(24px, env(safe-area-inset-bottom)) max(14px, env(safe-area-inset-left));
    }

    .container {
        padding: 22px 16px;
        width: 100%;
    }

    h1 {
        font-size: 24px;
    }

    #result {
        font-size: 14px;
        padding: 12px 48px 12px 12px;
    }

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

}

@media (orientation: landscape) and (max-height: 600px) {
    body {
        align-items: stretch;
    }

    .container {
        width: 100%;
        max-width: 580px;
        margin-bottom: 20px;
    }
}

/* ── Footer ───────────────────────────────────────────────────────────────── */
.site-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 12px;
    color: var(--text-secondary);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
}

.site-footer a:hover {
    color: var(--accent-color);
}

.site-footer span {
    opacity: 0.4;
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ── SEO content block ────────────────────────────────────────────────────── */
.seo-block {
    margin-top: 28px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
}

.seo-block h2 {
    font-size: 15px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.seo-block h3 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: 16px;
    margin-bottom: 6px;
}

.seo-block p {
    font-size: 13px;
    line-height: 1.7;
    color: var(--text-secondary);
}

.seo-block code {
    font-family: ui-monospace, 'Cascadia Code', monospace;
    font-size: 12px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 1px 5px;
    color: var(--text-primary);
}

.seo-block a {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
}

.seo-block a:hover {
    text-decoration: underline;
}

/* ── Crack Time ───────────────────────────────────────────────────────────── */
.cracktime-tool {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cracktime-scenarios {
    margin-top: 8px;
}

.cracktime-scenarios h3 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.scenario-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
}

.scenario-item {
    padding: 12px 14px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
}

.scenario-item strong {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-primary);
    display: block;
    margin-bottom: 6px;
}

.scenario-value {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent-color);
    margin: 6px 0;
}

.scenario-note {
    font-size: 11px;
    color: var(--text-secondary);
    opacity: 0.7;
}

.cracktime-disclaimer {
    margin-top: 12px;
    font-size: 11px;
    line-height: 1.5;
    color: var(--text-secondary);
    opacity: 0.7;
    padding: 10px 12px;
    background: var(--bg-canvas);
    border: 1px solid var(--border-color);
    border-radius: var(--control-radius);
}