/* Design tokens — see docs/design-system.md.
   Components consume tokens only; no raw hex or raw px in scoped styles. */

:root {
    --bg: #ffffff;
    --surface: #f6f7f9;
    --surface-elevated: #ffffff;
    --border: #e3e5ea;
    --border-strong: #c8ccd4;
    --text: #16181d;
    --text-muted: #5b6168;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-contrast: #ffffff;
    --primary-soft-bg: rgb(37 99 235 / 0.08);
    --danger: #b00020;
    --danger-soft-bg: #fff5f5;
    --success: #0a7d2c;
    --success-soft-bg: #eaf7ee;
    --warning-soft-bg: #fff5d6;
    --warning-border: #d6a800;
    --focus-ring: #2563eb;
    --focus-ring-soft: rgb(37 99 235 / 0.25);

    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.06);
    --shadow-md: 0 2px 8px rgb(0 0 0 / 0.08);

    --font-stack: system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

    --font-xs: 0.75rem;
    --font-sm: 0.875rem;
    /* Alias of --font-base at the body size; named on the xs/sm/md/lg/xl
       scale that some components reach for. */
    --font-md: 1rem;
    --font-base: 1rem;
    --font-lg: 1.125rem;
    --font-xl: 1.5rem;
    --font-2xl: 2rem;

    --leading-tight: 1.3;
    --leading-snug: 1.45;
    --leading-normal: 1.55;

    --weight-regular: 400;
    --weight-medium: 500;
    --weight-semibold: 600;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;

    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 10px;
    --radius-pill: 999px;

    --transition: 120ms ease-out;

    --icon-sm: 14px;
    --icon-md: 18px;
    --icon-lg: 22px;

    /* App-frame heights (fixed-position bars at the top and bottom of
       the viewport). These are first-paint fallbacks — the real
       values are written by ResizeObservers on the actual elements
       in +layout.svelte and the reader, so they reflect rendered
       size and survive font / zoom / wrap changes. */
    --app-header-h: 60px;
    --mobile-app-bar-h: 48px;
    --app-bottom-nav-h: 56px;
    --reader-nav-h: 56px;
    --reader-bar-h: 56px;

    /* Mobile breakpoint tokens. CSS @media queries can't read custom
       properties, so these are documented anchors — keep the pixel
       values in @media (max-width: 640px) etc. in lockstep. */
    --bp-sm: 640px;
    --bp-md: 768px;
    --bp-lg: 1024px;

    /* Comfortable touch-target floor for primary controls on phones.
       Controls compact to their desktop height by default and grow to
       this minimum under the 640px breakpoint. See touch-targets.test.ts
       for the shared-primitive contract. */
    --tap-min: 44px;

    /* Safe-area helpers for notched / home-indicator devices. Resolve
       to 0 on devices without insets, so they're safe everywhere as
       long as <meta name="viewport" content="…, viewport-fit=cover">
       is set (see app.html). */
    --safe-top: env(safe-area-inset-top, 0px);
    --safe-bottom: env(safe-area-inset-bottom, 0px);
    --safe-left: env(safe-area-inset-left, 0px);
    --safe-right: env(safe-area-inset-right, 0px);

    --z-dropdown: 10;
    --z-sticky: 50;
    /* Above the fixed header/app-bar (--z-sticky) so the nav progress bar
       is never occluded, but below modals and toasts. */
    --z-nav-progress: 60;
    --z-modal: 100;
    --z-toast: 1000;
}

:root[data-theme='dark'] {
    --bg: #0f1115;
    --surface: #161a21;
    --surface-elevated: #1c2129;
    --border: #2a2f37;
    --border-strong: #3a414d;
    --text: #e8eaed;
    --text-muted: #9aa0a6;
    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --primary-contrast: #0f1115;
    --primary-soft-bg: rgb(96 165 250 / 0.12);
    --danger: #f87171;
    --danger-soft-bg: #3a1620;
    --success: #4ade80;
    --success-soft-bg: #12301c;
    --warning-soft-bg: #3a2e10;
    --warning-border: #a37800;
    --focus-ring: #60a5fa;
    --focus-ring-soft: rgb(96 165 250 / 0.3);

    --shadow-sm: 0 1px 2px rgb(0 0 0 / 0.4);
    --shadow-md: 0 2px 8px rgb(0 0 0 / 0.5);
}

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

html,
body {
    margin: 0;
    padding: 0;
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-stack);
    font-size: var(--font-base);
    line-height: var(--leading-normal);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3 {
    color: var(--text);
    line-height: var(--leading-tight);
    font-weight: var(--weight-semibold);
    margin: 0 0 var(--space-3);
}

h1 {
    font-size: var(--font-2xl);
}

h2 {
    font-size: var(--font-xl);
}

h3 {
    font-size: var(--font-lg);
}

p {
    margin: 0 0 var(--space-3);
}

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

a:hover {
    text-decoration: underline;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[role='button']:focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

button,
input,
select,
textarea {
    font: inherit;
    color: inherit;
}

input[type='text'],
input[type='search'],
input[type='password'],
input[type='number'],
input[type='email'],
select,
textarea {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-md);
    padding: 0 var(--space-3);
    height: 36px;
    width: 100%;
    transition:
        border-color var(--transition),
        background var(--transition),
        box-shadow var(--transition);
}

textarea {
    height: auto;
    min-height: 6rem;
    padding: var(--space-2) var(--space-3);
    line-height: var(--leading-snug);
    resize: vertical;
}

input[type='text']:focus,
input[type='search']:focus,
input[type='password']:focus,
input[type='number']:focus,
input[type='email']:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--surface-elevated);
    box-shadow: 0 0 0 3px var(--focus-ring-soft);
}

input[aria-invalid='true'],
select[aria-invalid='true'],
textarea[aria-invalid='true'] {
    border-color: var(--danger);
}

input:disabled,
select:disabled,
textarea:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

button {
    cursor: pointer;
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    padding: 0 var(--space-3);
    height: 36px;
    font-weight: var(--weight-medium);
    color: var(--text);
    transition:
        background var(--transition),
        border-color var(--transition),
        color var(--transition);
}

button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    font-size: var(--font-sm);
    color: var(--text);
}

img {
    max-width: 100%;
    height: auto;
}

/* Horizontal-overflow safety net on phones. Manga apps never have a
   legitimate need for horizontal page scroll, and an off-screen
   element here often means another bug — but it's better to clip
   silently than to expose touch-pan that shifts the whole layout
   under the user's thumb. position:fixed descendants are unaffected,
   so the bottom nav / sticky CTAs still span edge-to-edge. */
@media (max-width: 640px) {
    html,
    body {
        overflow-x: hidden;
    }

    /* Touch-target floor on phones. Form controls and submit buttons keep
       their compact 36px desktop height above the breakpoint but grow to a
       comfortable tap size here. `min-height` (not `height`) so the
       already-tall textarea is unaffected. Scoped to text fields, selects,
       and `type=submit` deliberately — bare `button` would also catch dense
       icon buttons (chip remove, segmented options, reader chrome) that meet
       the floor through their own hit-area rules instead. */
    input[type='text'],
    input[type='search'],
    input[type='password'],
    input[type='number'],
    input[type='email'],
    select,
    button[type='submit'] {
        min-height: var(--tap-min);
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0ms !important;
        animation-duration: 0ms !important;
    }
}

/* Shared grid for manga cover cards — used by the catalog, author and
   collection pages, and the similar-mangas section. Single-sourced here
   so the responsive layout can't drift between pages. Four covers per
   row on phones is a deliberate user preference; `minmax(0, 1fr)` is
   load-bearing so the grid never overflows the viewport. */
.manga-grid {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-4);
}

/* A single cover cell — the catalog/author/collection cards and the
   loading skeleton share this so their layout can't drift. */
.manga-card {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    list-style: none;
    /* Grid items default to min-width: auto which equals the intrinsic
       content size — long author / title strings then push the cell past
       `1fr`. Forcing 0 lets the column control the width and the children
       ellipsize inside it. */
    min-width: 0;
}

@media (max-width: 640px) {
    .manga-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
        gap: var(--space-2);
    }
}
