/*
    Chain Wear Calculator — Pedalmath
    Тёмная тема по умолчанию, светлая через [data-theme="light"].
    Палитра наследует tire-pressure/gear-ratio.
*/

:root {
    --bg-page: #0f0f1a;
    --bg-card: #1a1a2e;
    --bg-card-hover: #222240;
    --color-text: #e0e0e0;
    --color-muted: #7070a0;
    --color-hint: #505070;
    --color-accent: #6c5ce7;
    --color-accent2: #00cec9;
    --color-warning: #e17055;
    --border: #2d2d44;
    --radius: 12px;
    --radius-sm: 8px;
}

[data-theme="light"] {
    --bg-page: #f0f1f5;
    --bg-card: #ffffff;
    --bg-card-hover: #ebebf4;
    --color-text: #2d2d3a;
    --color-muted: #666680;
    --color-hint: #9999b0;
    --color-accent: #5848c8;
    --color-accent2: #00a8a4;
    --border: #d0d0e4;
}

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

body {
    background-color: var(--bg-page);
    color: var(--color-text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    font-size: 22px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2.5rem 1.25rem 4rem;
    transition: background-color 0.3s, color 0.3s;
}

.page-title {
    width: 100%;
    max-width: 640px;
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 0.25rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
}

.page-title-icon {
    width: 32px;
    height: 32px;
    flex-shrink: 0;
    display: block;
}

.page-subtitle {
    width: 100%;
    max-width: 640px;
    font-size: 0.95rem;
    color: var(--color-muted);
    margin-bottom: 1.5rem;
}

.calculator {
    width: 100%;
    max-width: 640px;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* ============================================================
   ВКЛАДКИ
   ============================================================ */

.tab-switch {
    display: flex;
    gap: 0.4rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.3rem;
}

.tab-btn {
    flex: 1;
    padding: 0.7rem 0.5rem;
    background: none;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    cursor: pointer;
    font-size: 0.95rem;
    font-weight: 600;
    transition: background-color 0.2s, color 0.2s;
    font-family: inherit;
}

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

.tab-btn.active {
    background-color: var(--bg-card-hover);
    color: var(--color-accent2);
}

/* ============================================================
   СЕКЦИИ
   ============================================================ */

.section {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.section-label {
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-muted);
}

.section-hint {
    font-size: 0.85rem;
    color: var(--color-hint);
    margin-top: -0.4rem;
    line-height: 1.4;
}

.panel.hidden { display: none; }

/* ============================================================
   ИНПУТЫ
   ============================================================ */

.select-input,
.text-input {
    width: 100%;
    background-color: var(--bg-card);
    color: var(--color-text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.75rem 0.9rem;
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.select-input:focus,
.text-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

.select-input {
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path fill='%237070a0' d='M6 8L0 0h12z'/></svg>");
    background-repeat: no-repeat;
    background-position: right 0.9rem center;
    padding-right: 2.2rem;
}

.measure-input-row {
    display: flex;
    align-items: center;
    gap: 0.6rem;
}

.measure-input-row .text-input { flex: 1; }

.input-unit {
    color: var(--color-muted);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    min-width: 2.5rem;
}

/* ============================================================
   РАДИО-«ТАБЛЕТКИ» (12 / 10 звеньев)
   ============================================================ */

.radio-row {
    display: flex;
    gap: 0.5rem;
}

.radio-pill {
    flex: 1;
    cursor: pointer;
}

.radio-pill input[type="radio"] {
    display: none;
}

.radio-pill span {
    display: block;
    padding: 0.65rem 0.5rem;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    font-size: 0.85rem;
    font-weight: 600;
    text-align: center;
    transition: border-color 0.2s, color 0.2s, background-color 0.2s;
}

.radio-pill:hover span {
    color: var(--color-text);
}

.radio-pill input:checked + span {
    border-color: var(--color-accent);
    color: var(--color-accent);
    background-color: rgba(108, 92, 231, 0.1);
}

/* ============================================================
   РЕЗУЛЬТАТ
   ============================================================ */

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-block {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem 1.25rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    text-align: center;
}

.wear-value {
    font-size: clamp(2.2rem, 8vw, 3rem);
    font-weight: 700;
    line-height: 1;
    color: var(--color-text);
    transition: color 0.3s;
    white-space: nowrap;
}

.wear-status {
    font-size: 1rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-muted);
}

.wear-status.wear-fresh { color: #38bdf8; }
.wear-status.wear-ok    { color: #4ade80; }
.wear-status.wear-warn  { color: #f0b429; }
.wear-status.wear-danger { color: var(--color-warning); }

.result-block .wear-value-row {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.wear-tip {
    font-size: 0.9rem;
    color: var(--color-muted);
    line-height: 1.4;
    margin-top: 0.25rem;
    max-width: 32rem;
}

.disclaimer {
    margin-top: 0.5rem;
    padding: 0.6rem 0.75rem;
    background-color: rgba(108, 92, 231, 0.08);
    border-left: 3px solid var(--color-accent);
    border-radius: 4px;
    color: var(--color-muted);
    font-size: 0.8rem;
    line-height: 1.4;
    text-align: left;
    max-width: 32rem;
}

.disclaimer.hidden { display: none; }

/* ============================================================
   КНОПКИ ДЕЙСТВИЙ (share / print)
   ============================================================ */

.action-row {
    display: flex;
    gap: 0.6rem;
}

.action-btn {
    flex: 1;
    padding: 0.65rem 1rem;
    background: none;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--color-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    transition: color 0.2s, border-color 0.2s;
}

.action-btn:hover {
    color: var(--color-text);
    border-color: var(--color-muted);
}

.action-btn.copied {
    color: #4ade80;
    border-color: #4ade80;
}

/* ============================================================
   ФУТЕР
   ============================================================ */

.calc-footer {
    text-align: center;
    font-size: 0.8rem;
    color: var(--color-hint);
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

/* ============================================================
   TOP-CONTROLS (тема / язык / система)
   ============================================================ */

.top-controls {
    position: fixed;
    top: 1rem;
    right: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    z-index: 100;
}

.theme-toggle {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: 2px solid var(--border);
    background-color: var(--bg-card);
    cursor: pointer;
    font-size: 1.4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, border-color 0.3s;
}

.theme-toggle::after { content: '☀️'; }
[data-theme="light"] .theme-toggle::after { content: '🌙'; }

.lang-dropdown { position: relative; }

.lang-dropdown-btn {
    height: 48px;
    padding: 0 0.75rem;
    border-radius: 24px;
    border: 2px solid var(--border);
    background-color: var(--bg-card);
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    font-family: inherit;
    display: flex;
    align-items: center;
    gap: 0.35rem;
    transition: border-color 0.2s;
}

.lang-dropdown-btn:hover { border-color: var(--color-accent); }

.lang-arrow {
    font-size: 0.65rem;
    color: var(--color-muted);
    transition: transform 0.2s;
    margin-left: 2px;
}

.lang-dropdown.open .lang-arrow { transform: rotate(180deg); }

.lang-dropdown-menu {
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    background-color: var(--bg-card);
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
    z-index: 200;
    min-width: 90px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.lang-dropdown-menu.hidden { display: none; }

.lang-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: none;
    background: none;
    color: var(--color-text);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 600;
    text-align: left;
    font-family: inherit;
    transition: background-color 0.15s;
}

.lang-option:hover { background-color: var(--bg-card-hover); }
.lang-option.active { color: var(--color-accent); }

.system-toggle-btn {
    height: 48px;
    padding: 0 0.75rem;
    border-radius: 24px;
    border: 2px solid var(--border);
    background-color: var(--bg-card);
    color: var(--color-muted);
    cursor: pointer;
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    font-family: inherit;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
}

.system-toggle-btn:hover {
    color: var(--color-text);
    border-color: var(--color-accent);
}

.system-toggle-btn.imperial {
    color: var(--color-accent2);
    border-color: var(--color-accent2);
}

/* ============================================================
   PRINT
   ============================================================ */

@media print {
    @page { margin: 1.5cm; }

    * {
        -webkit-print-color-adjust: exact;
        print-color-adjust: exact;
    }

    body {
        background: #fff !important;
        color: #000 !important;
        padding: 0;
        min-height: auto;
    }

    .top-controls,
    .home-link,
    .tab-switch,
    .panel,
    .action-row,
    .calc-footer {
        display: none !important;
    }

    .page-title {
        color: #000 !important;
        font-size: 1.2rem;
    }

    .page-title-icon { display: none !important; }

    .page-subtitle {
        color: #555 !important;
        margin-bottom: 1rem;
    }

    .result-block {
        background: #fff !important;
        border: 2px solid #ddd !important;
        color: #000 !important;
        page-break-inside: avoid;
    }

    .wear-value { color: #000 !important; }
    .wear-status.wear-ok     { color: #16a34a !important; }
    .wear-status.wear-warn   { color: #d97706 !important; }
    .wear-status.wear-danger { color: #dc2626 !important; }
    .wear-status.wear-fresh  { color: #0284c7 !important; }
    .wear-tip { color: #444 !important; }
    .disclaimer {
        background: #f7f7f7 !important;
        border-left-color: #888 !important;
        color: #444 !important;
    }
}

.footer-sep {
    color: var(--color-hint);
    margin: 0 0.4em;
}
.footer-link {
    color: var(--color-hint);
    text-decoration: none;
    border-bottom: 1px dotted var(--color-hint);
    transition: color 0.15s, border-color 0.15s;
}
.footer-link:hover {
    color: var(--color-accent2);
    border-bottom-color: var(--color-accent2);
}