/* coi.philoid.app — mobile-first, mirroring the Android ConstitutionTheme. */

:root {
    --primary: #172554;
    --on-primary: #FFFFFF;
    --primary-container: #DCE7FF;
    --on-primary-container: #0B1B3F;
    --secondary: #6D28D9;
    --secondary-container: #EDE9FE;
    --on-secondary-container: #2E1065;
    --tertiary: #0891B2;
    --tertiary-container: #CFFAFE;
    --on-tertiary-container: #083344;
    --surface: #F8FAFC;
    --surface-container-low: #FFFFFF;
    --surface-container: #F1F5F9;
    --surface-variant: #E2E8F0;
    --on-surface: #0F172A;
    --on-surface-variant: #475569;
    --background: #F8FAFC;
    --outline-variant: #CBD5E1;
    --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 4px 16px rgba(15, 23, 42, .04);
    --shadow-lg: 0 8px 32px rgba(15, 23, 42, .10);

    --r-sm: 12px;
    --r-md: 18px;
    --r-lg: 24px;
    --r-xl: 28px;

    --content-max: 720px;
    --gutter: 22px;

    --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-serif: "Noto Serif", Georgia, "Times New Roman", serif;
    --font-hi: "Noto Serif Devanagari", "Noto Serif", Georgia, serif;
}

/* Dark tokens — applied when:
   - user explicitly toggled dark (`.theme-dark`), OR
   - system prefers dark AND user has not overridden to light. */
@media (prefers-color-scheme: dark) {
    :root:not(.theme-light) {
        --primary: #BFD0FF;
        --on-primary: #0B1B3F;
        --primary-container: #1E3A8A;
        --on-primary-container: #EAF0FF;
        --secondary: #C4B5FD;
        --secondary-container: #4C1D95;
        --on-secondary-container: #F5F3FF;
        --tertiary: #67E8F9;
        --tertiary-container: #164E63;
        --on-tertiary-container: #E0F7FA;
        --surface: #101827;
        --surface-container-low: #172033;
        --surface-container: #1E293B;
        --surface-variant: #334155;
        --on-surface: #F8FAFC;
        --on-surface-variant: #C9D1DF;
        --background: #0B1120;
        --outline-variant: #475569;
        --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 4px 16px rgba(0, 0, 0, .25);
        --shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);
    }
}
:root.theme-dark {
    --primary: #BFD0FF;
    --on-primary: #0B1B3F;
    --primary-container: #1E3A8A;
    --on-primary-container: #EAF0FF;
    --secondary: #C4B5FD;
    --secondary-container: #4C1D95;
    --on-secondary-container: #F5F3FF;
    --tertiary: #67E8F9;
    --tertiary-container: #164E63;
    --on-tertiary-container: #E0F7FA;
    --surface: #101827;
    --surface-container-low: #172033;
    --surface-container: #1E293B;
    --surface-variant: #334155;
    --on-surface: #F8FAFC;
    --on-surface-variant: #C9D1DF;
    --background: #0B1120;
    --outline-variant: #475569;
    --shadow: 0 1px 2px rgba(0, 0, 0, .35), 0 4px 16px rgba(0, 0, 0, .25);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, .5);
}

.theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 999px;
    background: var(--surface-container-low);
    color: var(--on-surface);
    border: 1px solid var(--outline-variant);
    cursor: pointer;
    padding: 0;
    transition: background .15s ease;
}
.theme-toggle:hover { background: var(--surface-container); }
.theme-toggle svg { display: block; }
.theme-toggle .icon-sun,
.theme-toggle .icon-moon { transition: opacity .15s ease, transform .25s ease; }
:root:not(.theme-dark) .theme-toggle .icon-sun { display: none; }
:root.theme-dark .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
    :root:not(.theme-light):not(.theme-dark) .theme-toggle .icon-moon { display: none; }
    :root:not(.theme-light):not(.theme-dark) .theme-toggle .icon-sun { display: block; }
}

.topbar-actions {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--background);
    color: var(--on-surface);
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body[data-lang="hi"] .reader-body,
body[data-lang="hi"] .reader-title {
    font-family: var(--font-hi);
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

.app-shell {
    min-height: 100vh;
    padding-bottom: 124px;
}

/* === Top bar === */
.topbar {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px var(--gutter);
    padding-top: calc(12px + env(safe-area-inset-top));
    background: color-mix(in srgb, var(--background) 86%, transparent);
    backdrop-filter: saturate(160%) blur(14px);
    -webkit-backdrop-filter: saturate(160%) blur(14px);
    border-bottom: 1px solid color-mix(in srgb, var(--outline-variant) 70%, transparent);
}

.topbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--on-surface);
    font-weight: 600;
    font-size: 15px;
    letter-spacing: -.01em;
}

.topbar-logo {
    width: 30px;
    height: 30px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 9px;
    background: linear-gradient(135deg, var(--primary), var(--tertiary));
    color: var(--on-primary);
}

.topbar-title { white-space: nowrap; }

.lang-switch {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 44px;
    height: 36px;
    padding: 0 14px;
    border-radius: 999px;
    border: 1px solid var(--outline-variant);
    background: var(--surface-container-low);
    color: var(--on-surface);
    font-weight: 600;
    font-size: 13px;
    text-decoration: none;
}

/* === Generic === */
.content {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--gutter);
}

.section-heading {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: -.01em;
    margin: 32px 0 14px;
    color: var(--on-surface);
}

/* === Landing === */
.landing-hero {
    margin: 32px 0 12px;
}

.landing-hero__badge {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--tertiary));
    color: var(--on-primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.landing-hero__title {
    font-size: clamp(36px, 8vw, 56px);
    line-height: 1.05;
    letter-spacing: -.025em;
    font-weight: 800;
    margin: 0 0 12px;
    color: var(--on-surface);
}

.landing-hero__sub {
    font-size: 17px;
    color: var(--on-surface-variant);
    max-width: 520px;
    margin: 0 0 24px;
}

.landing-hero__ctas {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 13px 20px;
    border-radius: 14px;
    border: none;
    font: inherit;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: transform .12s ease, background .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(.985); }

.btn--primary {
    background: var(--primary);
    color: var(--on-primary);
}
.btn--primary:hover { background: color-mix(in srgb, var(--primary) 92%, black); }

.btn--ghost {
    background: var(--surface-container-low);
    color: var(--on-surface);
    border: 1px solid var(--outline-variant);
}

/* === Entry tiles (landing nav) === */
.entry-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 28px 0 8px;
}

.entry-tile {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 18px 16px 20px;
    border-radius: var(--r-lg);
    background: var(--surface-container-low);
    border: 1px solid color-mix(in srgb, var(--outline-variant) 70%, transparent);
    color: var(--on-surface);
    text-decoration: none;
    box-shadow: var(--shadow);
    overflow: hidden;
    min-height: 120px;
    transition: transform .12s ease, box-shadow .15s ease, border-color .15s ease;
}
.entry-tile:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
    border-color: color-mix(in srgb, var(--primary) 50%, transparent);
    text-decoration: none;
}

.entry-tile__icon {
    width: 38px;
    height: 38px;
    border-radius: 12px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--on-primary);
    background: linear-gradient(135deg, var(--primary), var(--tertiary));
}

.entry-tile--schedules .entry-tile__icon { background: linear-gradient(135deg, var(--tertiary), var(--primary)); }
.entry-tile--amendments .entry-tile__icon { background: linear-gradient(135deg, var(--secondary), var(--primary)); }
.entry-tile--preamble .entry-tile__icon { background: linear-gradient(135deg, var(--primary), var(--secondary)); }

.entry-tile strong {
    font-size: 16px;
    font-weight: 700;
    line-height: 1.1;
    color: var(--on-surface);
}

.entry-tile__sub {
    font-size: 12px;
    color: var(--on-surface-variant);
}

.entry-tile__arrow {
    position: absolute;
    top: 16px;
    right: 16px;
    color: var(--on-surface-variant);
    font-size: 18px;
    line-height: 1;
    opacity: .6;
}

.landing-features {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin: 36px 0;
}

@media (min-width: 720px) {
    .landing-features { grid-template-columns: repeat(3, 1fr); }
}

.feature {
    padding: 18px;
    border-radius: var(--r-md);
    background: var(--surface-container-low);
    border: 1px solid color-mix(in srgb, var(--outline-variant) 70%, transparent);
    box-shadow: var(--shadow);
}

.feature__icon {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--primary) 12%, transparent);
    color: var(--primary);
    margin-bottom: 10px;
}

.feature h3 {
    margin: 0 0 4px;
    font-size: 16px;
    font-weight: 700;
    color: var(--on-surface);
}

.feature p {
    margin: 0;
    color: var(--on-surface-variant);
    font-size: 14px;
}

.card-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 18px;
    border-radius: var(--r-md);
    background: var(--surface-container-low);
    border: 1px solid color-mix(in srgb, var(--outline-variant) 70%, transparent);
    color: var(--on-surface);
    text-decoration: none;
    box-shadow: var(--shadow);
    transition: transform .12s ease, box-shadow .15s ease;
}
.card:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); text-decoration: none; }

.card__chip {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--primary);
    background: color-mix(in srgb, var(--primary) 10%, transparent);
    padding: 4px 8px;
    border-radius: 999px;
}

.card__title {
    flex: 1;
    font-weight: 600;
    font-size: 15px;
}

.card__arrow {
    color: var(--on-surface-variant);
    display: inline-flex;
}

/* === Listing pages (parts list, part children, schedules, amendments) === */
.listing { margin: 18px 0; }

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px 6px 8px;
    margin-bottom: 14px;
    border-radius: 999px;
    background: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    color: var(--on-surface-variant);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
}
.back-link:hover {
    color: var(--on-surface);
    background: var(--surface-container);
    text-decoration: none;
}

.listing-hero {
    padding: 24px 22px;
    border-radius: var(--r-xl);
    background: linear-gradient(135deg, var(--primary-container), var(--tertiary-container));
    color: var(--on-primary-container);
    margin-bottom: 22px;
    box-shadow: var(--shadow);
}

.listing-hero__title {
    margin: 0 0 6px;
    font-size: clamp(26px, 6vw, 32px);
    line-height: 1.15;
    letter-spacing: -.02em;
    font-weight: 800;
    color: var(--on-primary-container);
}

.listing-hero__sub {
    margin: 0;
    color: color-mix(in srgb, var(--on-primary-container) 82%, transparent);
    font-size: 14px;
}

.listing-empty {
    padding: 36px 0;
    text-align: center;
    color: var(--on-surface-variant);
}

.listing-items {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.listing-item--no-index {
    grid-template-columns: 1fr auto !important;
}

.listing-item {
    display: grid;
    grid-template-columns: 40px 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 12px 14px;
    border-radius: var(--r-md);
    background: var(--surface-container-low);
    border: 1px solid color-mix(in srgb, var(--outline-variant) 70%, transparent);
    color: var(--on-surface);
    text-decoration: none;
    transition: transform .12s ease, border-color .15s ease, box-shadow .15s ease;
}
.listing-item:hover {
    transform: translateY(-1px);
    border-color: color-mix(in srgb, var(--primary) 50%, transparent);
    box-shadow: var(--shadow);
    text-decoration: none;
}

.listing-item__index {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: color-mix(in srgb, var(--primary) 12%, transparent);
    color: var(--primary);
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 14px;
}

.listing-item__copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.listing-item__title {
    font-size: 15px;
    font-weight: 600;
    color: var(--on-surface);
    line-height: 1.25;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.listing-item__preview {
    font-size: 12.5px;
    color: var(--on-surface-variant);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.listing-item__arrow {
    color: var(--on-surface-variant);
    display: inline-flex;
}

/* === Reader === */
.reader { margin: 24px 0; }

.reader-hero {
    padding: 28px 24px;
    border-radius: var(--r-xl);
    background: linear-gradient(135deg, var(--primary-container), var(--tertiary-container));
    color: var(--on-primary-container);
    margin-bottom: 28px;
    box-shadow: var(--shadow);
}

.reader-chip {
    display: inline-flex;
    align-items: center;
    height: 24px;
    padding: 0 10px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--primary) 16%, transparent);
    color: var(--on-primary-container);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .08em;
    text-transform: uppercase;
    margin-bottom: 14px;
}

.reader-title {
    margin: 0 0 6px;
    font-size: clamp(28px, 6vw, 38px);
    line-height: 1.15;
    letter-spacing: -.02em;
    font-weight: 800;
    color: var(--on-primary-container);
}

.reader-meta {
    margin: 0;
    color: color-mix(in srgb, var(--on-primary-container) 82%, transparent);
    font-size: 14px;
}

.reader-body {
    font-family: var(--font-serif);
    font-size: 18px;
    line-height: 1.78;
    color: var(--on-surface);
    word-wrap: break-word;
    overflow-wrap: anywhere;
}

.reader-body p:first-child { margin-top: 0; }
.reader-body p:last-child { margin-bottom: 0; }

/* Prev / next */
.reader-nav {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 40px 0 28px;
}

.reader-nav__link {
    display: flex;
    flex-direction: column;
    gap: 4px;
    padding: 14px 16px;
    border-radius: var(--r-md);
    background: var(--surface-container-low);
    border: 1px solid var(--outline-variant);
    color: var(--on-surface);
    text-decoration: none;
    overflow: hidden;
    position: relative;
    box-shadow: var(--shadow);
    min-height: 76px;
}
.reader-nav__link:hover { text-decoration: none; border-color: var(--primary); }

.reader-nav__link--next { text-align: right; }

.reader-nav__label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: var(--on-surface-variant);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.reader-nav__link--next .reader-nav__label {
    justify-content: flex-end;
}

.reader-nav__title {
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.reader-nav__link svg {
    position: absolute;
    top: 14px;
    color: var(--primary);
}
.reader-nav__link--prev svg { left: 12px; opacity: .0; }
.reader-nav__link--next svg { right: 12px; opacity: .0; }

.reader-nav__spacer { display: block; }

/* CTA card after reader content */
.cta-card {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 14px;
    align-items: center;
    padding: 18px;
    margin: 24px 0 4px;
    border-radius: var(--r-lg);
    background: linear-gradient(135deg, var(--primary-container), var(--secondary-container));
    color: var(--on-primary-container);
    box-shadow: var(--shadow);
}

.cta-card__icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: color-mix(in srgb, var(--primary) 18%, transparent);
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.cta-card__copy {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 0;
}
.cta-card__copy strong { font-size: 15px; font-weight: 700; }
.cta-card__copy span { font-size: 13px; color: color-mix(in srgb, var(--on-primary-container) 80%, transparent); }

.cta-card__btn {
    background: var(--primary);
    color: var(--on-primary);
    padding: 11px 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
}

@media (max-width: 520px) {
    .cta-card { grid-template-columns: 1fr; text-align: left; }
    .cta-card__btn { justify-self: start; }
}

/* === Empty / 404 === */
.empty {
    text-align: center;
    padding: 56px 12px;
    max-width: 540px;
    margin: 0 auto;
}
.empty__icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 18px;
    color: var(--on-surface-variant);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--surface-container);
}
.empty h1 {
    font-size: 24px;
    margin: 0 0 6px;
    letter-spacing: -.01em;
}
.empty p {
    color: var(--on-surface-variant);
    margin: 0 0 24px;
}
.empty__ctas {
    display: inline-flex;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: center;
}

/* === Page footer === */
.page-footer {
    max-width: var(--content-max);
    margin: 56px auto 0;
    padding: 24px var(--gutter);
    color: var(--on-surface-variant);
    font-size: 13px;
    text-align: center;
}

/* === Sticky install banner === */
.install-banner {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: calc(12px + env(safe-area-inset-bottom));
    z-index: 20;
    border-radius: var(--r-lg);
    background: var(--surface-container-low);
    border: 1px solid color-mix(in srgb, var(--outline-variant) 80%, transparent);
    box-shadow: var(--shadow-lg);
    transition: transform .28s ease, opacity .28s ease;
}

.install-banner--dismissed {
    transform: translateY(calc(100% + 24px));
    opacity: 0;
    pointer-events: none;
}

.install-inner {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
}

.install-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
    min-width: 0;
}

.install-eyebrow {
    font-size: 11px;
    font-weight: 700;
    letter-spacing: .06em;
    text-transform: uppercase;
    color: var(--on-surface-variant);
}
.install-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--on-surface);
    line-height: 1.2;
}

.install-cta {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary);
    color: var(--on-primary);
    padding: 10px 14px;
    border-radius: 999px;
    font-weight: 600;
    font-size: 14px;
    white-space: nowrap;
}
.install-cta:hover { background: color-mix(in srgb, var(--primary) 92%, black); text-decoration: none; }

.install-close {
    background: transparent;
    border: none;
    color: var(--on-surface-variant);
    font-size: 22px;
    line-height: 1;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
}
.install-close:hover { background: var(--surface-container); }

@media (max-width: 420px) {
    .install-inner { grid-template-columns: 1fr auto; }
    .install-close { grid-column: 2; grid-row: 1; }
    .install-cta { grid-column: 1 / -1; grid-row: 2; justify-content: center; }
}