/*
 * SchoolCompare.co.uk — "Cohort"
 *
 * A school's number means nothing on its own; its position in the national
 * distribution does. That idea drives the identity: the logo is the same
 * five-bar spread that appears inside every school row.
 *
 * Colour has exactly three jobs and they never borrow each other's hues:
 *   brand   (iris)          interactive + identity. Never carries valence.
 *   status  (teal / amber)  valence — teal is above/good, amber is
 *                           below/needs-attention. Never a CTA.
 *   phase   (desaturated)   category chips, deliberately subordinate.
 *
 * Escalate within status by weight, not by reaching for a new hue: a tinted
 * amber chip for "requires improvement", a solid amber one for "inadequate".
 *
 * Teal/amber rather than green/red so the above/below signal survives every
 * form of colour blindness — the audience includes parents reading closely.
 */

:root {
    color-scheme: light;

    /* ── Ground ─────────────────────────────────────────────────────── */
    --bg-primary: #f2f1ed;      /* paper, not cream — warm enough to read as a document */
    --bg-secondary: #e9e8e2;
    --bg-card: #fcfcfa;
    --surface-inverse: #16202a; /* dark fills: skip link, active nav, tooltips */

    /* ── Ink ────────────────────────────────────────────────────────── */
    --text-primary: #16202a;
    --text-secondary: #4a545f;
    --text-muted: #5c6570;      /* 5.3:1 on --bg-primary */
    --text-inverse: #f7f7f4;

    /* ── Line ───────────────────────────────────────────────────────── */
    --border: #dedcd5;
    --border-strong: #cdcac1;

    /* ── Brand: iris ────────────────────────────────────────────────── */
    --brand: #584a9b;           /* 6.9:1 on --bg-primary */
    --brand-strong: #473c80;    /* hover on brand fills */
    --brand-stronger: #3a3069;  /* active/pressed */
    --brand-bg: rgba(88, 74, 155, 0.10);
    --brand-on: #fcfcfa;        /* text/icon sitting on a brand fill */

    /* ── Status: above / at / below the comparison point ────────────── */
    --status-above: #0e6e66;    /* 5.2:1 on --bg-primary */
    --status-above-bg: rgba(14, 110, 102, 0.10);
    --status-below: #9a5b00;    /* 4.8:1 on --bg-primary */
    --status-below-bg: rgba(154, 91, 0, 0.11);
    --status-at: var(--text-muted);
    --status-at-bg: rgba(92, 101, 112, 0.10);

    /* ── Charts: the same three hues, extended by lightness only ────── */
    --chart-1: #584a9b;
    --chart-2: #0e6e66;
    --chart-3: #9a5b00;
    --chart-4: #8a7cc9;
    --chart-5: #3e9c92;
    --chart-6: #c9903d;
    --chart-grid: #dedcd5;
    --chart-reference: #5c6570; /* national/LA reference lines */

    /* ── Series: up to 8 schools compared at once ───────────────────────
       Categorical needs distinguishable hues, so this ramp is wider than the
       three-hue rule — but every step is held to the same mid-dark tone and
       moderate saturation, and every one clears AA on --bg-primary, so they
       read as one family and work as legend text as well as chart lines. */
    --series-1: #584a9b;
    --series-2: #0e6e66;
    --series-3: #9a5b00;
    --series-4: #a03a5e;
    --series-5: #2f5f8f;
    --series-6: #4a6b2f;
    --series-7: #7a3f7a;
    --series-8: #97442a;

    /* ── Phase: category, desaturated so it stays under the status hues ── */
    --phase-primary: #4a6072;
    --phase-primary-bg: rgba(74, 96, 114, 0.10);
    --phase-primary-text: #3b4e5e;
    --phase-secondary: #5f5480;
    --phase-secondary-bg: rgba(95, 84, 128, 0.10);
    --phase-secondary-text: #4e4570;
    --phase-all-through: #4b6b57;
    --phase-all-through-bg: rgba(75, 107, 87, 0.10);
    --phase-all-through-text: #3d5847;
    --phase-post16: #7a6242;
    --phase-post16-bg: rgba(122, 98, 66, 0.10);
    --phase-post16-text: #645036;
    --phase-nursery: #7a5560;
    --phase-nursery-bg: rgba(122, 85, 96, 0.10);
    --phase-nursery-text: #64454f;

    /* ── Medals: rankings podium. Metal, not palette — kept legible on
          both grounds rather than literally gold/silver/bronze. ───────── */
    --medal-gold: #a67c00;
    --medal-silver: #6f7580;
    --medal-bronze: #8a5a2b;

    /* ── Channels ───────────────────────────────────────────────────────
       CSS can't interpolate a hex token into rgba(), so any tint that needs
       an arbitrary alpha reads the raw channels from here. Keep these in
       sync with the hex tokens above — they are the same colours. */
    --brand-rgb: 88, 74, 155;
    --status-above-rgb: 14, 110, 102;
    --status-below-rgb: 154, 91, 0;
    --ink-rgb: 22, 32, 42;
    --text-inverse-rgb: 247, 247, 244;
    --shadow-rgb: 22, 32, 42;
    --muted-rgb: 92, 101, 112;
    --phase-secondary-rgb: 95, 84, 128;
    --medal-silver-rgb: 111, 117, 128;
    --medal-bronze-rgb: 138, 90, 43;

    /* ── Elevation ──────────────────────────────────────────────────── */
    --shadow-soft: 0 1px 2px rgba(22, 32, 42, 0.04), 0 2px 8px rgba(22, 32, 42, 0.05);
    --shadow-medium: 0 4px 20px rgba(22, 32, 42, 0.09);
    --shadow-strong: 0 8px 40px rgba(22, 32, 42, 0.14);
    --scrim: rgba(22, 32, 42, 0.55);

    /* ── Type ───────────────────────────────────────────────────────── */
    --font-display: var(--font-schibsted), 'Schibsted Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-ui: var(--font-schibsted), 'Schibsted Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-data: var(--font-schibsted), 'Schibsted Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-prose: var(--font-literata), 'Literata', Georgia, serif;

    /* Type scale, 1.2 ratio off a 1rem base. New work should use these
       rather than inventing another font-size. */
    --step--2: 0.694rem;
    --step--1: 0.833rem;
    --step-0: 1rem;
    --step-1: 1.2rem;
    --step-2: 1.44rem;
    --step-3: 1.728rem;
    --step-4: 2.074rem;
    --step-5: 2.488rem;

    /* ── Geometry & motion ──────────────────────────────────────────── */
    --radius-sm: 3px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-xl: 16px;

    --transition: 0.2s ease;
    --transition-slow: 0.4s ease;
}

/*
 * Dark theme. Not an inversion — the accent and both status hues are lifted
 * independently so each still clears AA on the dark ground, and --brand-on
 * flips to dark because the brand fill is now the lighter of the pair.
 *
 * Tokens only. Never style a component from inside this block, or the two
 * themes drift apart the first time someone edits one of them.
 */
@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;

        --bg-primary: #10151b;
        --bg-secondary: #161c24;
        --bg-card: #171d25;
        --surface-inverse: #e4e9ee;

        --text-primary: #e4e9ee;
        --text-secondary: #b4bec8;
        --text-muted: #8d99a6;      /* 6.4:1 on --bg-primary */
        --text-inverse: #10151b;

        --border: #28313b;
        --border-strong: #38434f;

        --brand: #9c8ce8;           /* 6.5:1 on --bg-primary */
        --brand-strong: #b0a3ee;
        --brand-stronger: #c2b8f3;
        --brand-bg: rgba(156, 140, 232, 0.14);
        --brand-on: #10151b;

        --status-above: #3fb3a4;    /* 7.2:1 */
        --status-above-bg: rgba(63, 179, 164, 0.14);
        --status-below: #d99b2e;    /* 7.7:1 */
        --status-below-bg: rgba(217, 155, 46, 0.14);
        --status-at-bg: rgba(141, 153, 166, 0.14);

        --chart-1: #9c8ce8;
        --chart-2: #3fb3a4;
        --chart-3: #d99b2e;
        --chart-4: #6f5fc4;
        --chart-5: #2b8a7e;
        --chart-6: #a97420;
        --chart-grid: #28313b;
        --chart-reference: #8d99a6;

        --series-1: #9c8ce8;
        --series-2: #3fb3a4;
        --series-3: #d99b2e;
        --series-4: #e07a9d;
        --series-5: #6fa8dc;
        --series-6: #94c46b;
        --series-7: #c48bc4;
        --series-8: #e08a6b;

        --phase-primary: #8aa4b8;
        --phase-primary-bg: rgba(138, 164, 184, 0.14);
        --phase-primary-text: #a3bacd;
        --phase-secondary: #a294c4;
        --phase-secondary-bg: rgba(162, 148, 196, 0.14);
        --phase-secondary-text: #b7abd6;
        --phase-all-through: #8bb098;
        --phase-all-through-bg: rgba(139, 176, 152, 0.14);
        --phase-all-through-text: #a2c2ad;
        --phase-post16: #bfa27c;
        --phase-post16-bg: rgba(191, 162, 124, 0.14);
        --phase-post16-text: #d0b795;
        --phase-nursery: #bf98a3;
        --phase-nursery-bg: rgba(191, 152, 163, 0.14);
        --phase-nursery-text: #d1aeb8;

        --medal-gold: #d4a72c;
        --medal-silver: #a8b0bb;
        --medal-bronze: #c08552;

        --brand-rgb: 156, 140, 232;
        --status-above-rgb: 63, 179, 164;
        --status-below-rgb: 217, 155, 46;
        --ink-rgb: 228, 233, 238;
        --text-inverse-rgb: 16, 21, 27;
        --shadow-rgb: 0, 0, 0;
        --muted-rgb: 141, 153, 166;
        --phase-secondary-rgb: 162, 148, 196;
        --medal-silver-rgb: 168, 176, 187;
        --medal-bronze-rgb: 192, 133, 82;

        --shadow-soft: 0 1px 2px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.45);
        --shadow-strong: 0 8px 40px rgba(0, 0, 0, 0.6);
        --scrim: rgba(4, 7, 10, 0.7);
    }
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-ui);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    /* dvh (dynamic viewport) accounts for iOS Safari's collapsing toolbar;
       fall back to vh on older engines that don't recognise dvh. */
    min-height: 100vh;
    min-height: 100dvh;
    /* Suppress the iOS Safari grey tap flash — explicit :active states
       below carry the press feedback instead. */
    -webkit-tap-highlight-color: transparent;
}

/* Every digit that could line up in a column does. This is a data product;
   proportional numerals in a results table read as amateur. */
table,
[data-numeric] {
    font-variant-numeric: tabular-nums;
}

/* Prose gets the serif; the interface never does. */
.prose {
    font-family: var(--font-prose);
    font-size: var(--step-0);
    line-height: 1.65;
}

/* Provide a baseline press feedback for the most common interactive
   elements — replaces the suppressed default tap highlight. Buttons and
   .btn-* classes carry their own :active states already; this handles
   plain anchors used as inline links and bare button elements. */
@media (hover: none) and (pointer: coarse) {
    a:active,
    button:active {
        opacity: 0.7;
    }
}

/* Reserve space for the fixed mobile bottom tab bar (56px + safe-area inset). */
@media (max-width: 640px) {
    body {
        padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px));
    }
}

/* Skip link — visible only on focus for keyboard users */
.skip-link {
    position: absolute;
    top: -100px;
    left: 1rem;
    z-index: 10000;
    padding: 0.5rem 1rem;
    background: var(--surface-inverse);
    color: var(--text-inverse);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: top 0.15s ease;
}
.skip-link:focus {
    top: 0.5rem;
}

/* Focus indicators — brand hue, visible on both grounds */
:focus-visible {
    outline: 2px solid var(--brand);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* ================================================================
   Shared button classes — use these across all components
   ================================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.375rem;
    padding: 0.5rem 1rem;
    font-family: var(--font-ui);
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
    text-decoration: none;
    white-space: nowrap;
}
.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary: brand fill — main CTAs (Search, Compare now) */
.btn-primary {
    background: var(--brand);
    color: var(--brand-on);
    border-color: var(--brand);
}
.btn-primary:hover:not(:disabled) {
    background: var(--brand-strong);
    border-color: var(--brand-strong);
}
.btn-primary:active:not(:disabled) {
    background: var(--brand-stronger);
    border-color: var(--brand-stronger);
}

/* Secondary: brand outline — supporting actions (Add to shortlist) */
.btn-secondary {
    background: transparent;
    color: var(--brand);
    border: 1px solid var(--brand);
}
.btn-secondary:hover:not(:disabled) {
    background: var(--brand-bg);
}

/* Tertiary: quiet — low-emphasis (View, Clear) */
.btn-tertiary {
    background: var(--bg-secondary);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-tertiary:hover:not(:disabled) {
    background: var(--border);
    color: var(--text-primary);
}

/* Active toggle state — the shortlist button once a school is on the list */
.btn-active {
    background: var(--brand-bg);
    color: var(--brand);
    border: 1px solid var(--brand);
}
.btn-active:hover:not(:disabled) {
    background: transparent;
    color: var(--text-secondary);
    border-color: var(--border-strong);
}

/* Small variant */
.btn-sm {
    padding: 0.3rem 0.625rem;
    font-size: 0.8125rem;
}

/* Main content column */
.main {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 1.5rem;
    min-width: 0;
    overflow-x: clip;
}

@media (max-width: 768px) {
    .main {
        padding: 1rem;
    }
}

/* Honour the OS setting. Transitions collapse to near-instant rather than
   zero so state changes still register as changes. */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}