/* Sovereign Warmth Design System */
@import url('https://fonts.bunny.net/css?family=jetbrains-mono:400|newsreader:400,400i,700|public-sans:400,600&display=swap');

/* Registered color tokens — enables CSS transitions on custom properties */
@property --color-canvas { syntax: '<color>'; inherits: true; initial-value: #f4f1eb; }
@property --color-ink { syntax: '<color>'; inherits: true; initial-value: #2c2825; }
@property --color-cloudberry { syntax: '<color>'; inherits: true; initial-value: #db8a00; }
@property --color-cloudberry-text { syntax: '<color>'; inherits: true; initial-value: #965e00; }
@property --color-falu-red { syntax: '<color>'; inherits: true; initial-value: #8c2121; }
@property --color-stone { syntax: '<color>'; inherits: true; initial-value: #d3ccc3; }

:root {
    color-scheme: light;

    --color-canvas: light-dark(#f4f1eb, #1a1816);
    --color-ink: light-dark(#2c2825, #e8e4df);
    --color-cloudberry: light-dark(#db8a00, #e9a833);
    --color-cloudberry-text: light-dark(#965e00, #d4a24a);
    --color-falu-red: light-dark(#8c2121, #d45c5c);
    --color-stone: light-dark(#d3ccc3, #3a3530);
    --color-highlight: light-dark(rgba(219, 138, 0, 0.05), rgba(219, 138, 0, 0.08));
    --color-panel-bg: light-dark(rgba(255, 255, 255, 0.3), rgba(255, 255, 255, 0.05));
    --color-kbd-bg: light-dark(rgba(255, 255, 255, 0.5), rgba(255, 255, 255, 0.08));

    --font-ui: 'Public Sans', system-ui, sans-serif;
    --font-body: 'Newsreader', serif;
    --font-mono: 'JetBrains Mono', monospace;

    font-size-adjust: 0.5;
}

body {
    background-color: var(--color-canvas);
    color: var(--color-ink);
    font-family: var(--font-body);
    font-size: 1.125rem;
    line-height: 1.6;
    margin: 0;
    padding: 2rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    scrollbar-color: var(--color-stone) var(--color-canvas);
}

main {
    width: 100%;
    max-width: 640px;
}

h1, h2, h3 {
    font-family: var(--font-ui);
    color: var(--color-ink);
    font-weight: 600;
    margin-top: 0;
}

h1 {
    font-size: 1.75rem;
    border-bottom: 1px solid var(--color-stone);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    text-wrap: balance;
}

h3 {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-falu-red);
    margin-bottom: 0.5rem;
    margin-top: 1.25rem;
    border-bottom: 1px solid var(--color-stone);
    padding-bottom: 0.25rem;
}

h3:first-of-type {
    margin-top: 0;
}

p {
    margin-bottom: 1.5rem;
    text-wrap: pretty;
}

a {
    color: var(--color-falu-red);
    text-decoration: none;
}

@media (hover: hover) {
    a:hover {
        text-decoration: underline;
    }
}

code {
    font-family: var(--font-mono);
    font-size: 0.9em;
    font-size-adjust: 0.52;
}

.panel {
    border: 1px solid var(--color-stone);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    background-color: var(--color-panel-bg);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.input-group:last-child {
    margin-bottom: 0;
}

label {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
}

.radio-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-family: var(--font-ui);
    font-size: 0.95rem;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 400;
    cursor: pointer;
}

input[type="radio"],
input[type="checkbox"] {
    accent-color: var(--color-falu-red);
    width: 1.1rem;
    height: 1.1rem;
    cursor: pointer;
}

/* Drop Zone */
.drop-zone {
    border: 2px dashed var(--color-stone);
    padding: 2rem 1.5rem;
    text-align: center;
    position: relative;
    transition: border-color 0.2s, background-color 0.2s;
}

.drop-zone--active {
    border-color: var(--color-cloudberry);
    border-style: solid;
    background-color: var(--color-highlight);
}

.drop-zone--received {
    border-color: var(--color-cloudberry);
    border-style: solid;
}

.drop-zone__prompt {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    color: var(--color-ink);
    opacity: 0.7;
    margin: 0;
}

.drop-zone__prompt kbd {
    opacity: 0.5;
    font-size: 0.8em;
    vertical-align: baseline;
}

.drop-zone__hint {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    color: var(--color-ink);
    opacity: 0.4;
    margin: 0.5rem 0 0;
}

.drop-zone__browse {
    color: var(--color-falu-red);
    text-decoration: underline;
    cursor: pointer;
    font-weight: 600;
}

.drop-zone input[type="file"] {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
    padding: 0;
}

.file-count:not(:empty) {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-cloudberry-text);
    margin-top: 0.75rem;
}

.file-count__clear {
    font-family: inherit;
    font-size: inherit;
    font-weight: 600;
    color: var(--color-falu-red);
    cursor: pointer;
    background: none;
    border: none;
    padding: 0;
    text-decoration: none;
}

@media (hover: hover) {
    .file-count__clear:hover {
        text-decoration: underline;
    }
}

/* Preview Table */
dl {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.25rem 1rem;
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-size-adjust: 0.52;
}

dt {
    color: var(--color-ink);
    opacity: 0.8;
    border-bottom: 1px solid var(--color-stone);
    padding-bottom: 0.2rem;
}

dd {
    margin: 0;
    font-weight: bold;
    border-bottom: 1px solid var(--color-stone);
    padding-bottom: 0.2rem;
}

/* Colour Swatch */
.color-swatch {
    display: inline-block;
    width: 0.85em;
    height: 0.85em;
    border-radius: 50%;
    border: 1px solid var(--color-stone);
    vertical-align: middle;
    margin-right: 0.35em;
}

/* Profile Chips (multi-file) */
.profile-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.profile-chip {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    padding: 0.5rem 0.75rem;
    min-height: 2.75rem;
    border: 1px solid var(--color-stone);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.35em;
    transition: border-color 0.2s;
}

@media (hover: hover) {
    .profile-chip:hover {
        border-color: var(--color-ink);
    }
}

.profile-chip:active {
    transform: translateY(1px);
}

.profile-chip__remove {
    margin-left: 0.35em;
    font-size: 1.1em;
    line-height: 1;
    opacity: 0.4;
    cursor: pointer;
    transition: opacity 0.15s;
}

@media (hover: hover) {
    .profile-chip__remove:hover {
        opacity: 1;
    }
}

.profile-chip--active {
    border-color: var(--color-falu-red);
    border-bottom-width: 2px;
}

.notice {
    font-family: var(--font-ui);
    font-size: 0.85rem;
    color: var(--color-falu-red);
    margin-top: 1rem;
    padding: 0.5rem;
    border-left: 2px solid var(--color-falu-red);
    transition: color 0.3s, border-color 0.3s;
}

.notice.high-flow {
    color: var(--color-cloudberry-text);
    border-left-color: var(--color-cloudberry);
}

/* Button reset */
button {
    font-family: var(--font-ui);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    padding: 0;
    background: none;
    color: inherit;
}

/* Download Button */
#download-btn {
    background-color: var(--color-falu-red);
    color: var(--color-canvas);
    padding: 0.75rem 1.5rem;
    width: 100%;
    margin-bottom: 1.5rem;
    transition: background-color 0.2s, transform 0.05s;
}

#download-btn:focus-visible {
    outline: 2px solid var(--color-cloudberry);
    outline-offset: 2px;
}

@media (hover: hover) {
    #download-btn:hover {
        background-color: var(--color-ink);
    }
}

#download-btn:not(:disabled):active {
    transform: translateY(1px);
}

#download-btn:disabled {
    background-color: var(--color-stone);
    color: var(--color-ink);
    cursor: not-allowed;
    opacity: 0.7;
}

#download-btn.btn--confirmed {
    background-color: var(--color-cloudberry-text);
}

/* Preview Section — smooth reveal via grid height animation */
#preview-section {
    display: grid;
    grid-template-rows: 0fr;
    opacity: 0;
    overflow: hidden;
    border: 1px solid var(--color-stone);
    padding: 0 1.5rem;
    margin-bottom: 1.5rem;
    background-color: var(--color-panel-bg);
    transition: grid-template-rows 0.4s ease, opacity 0.3s ease 0.1s, padding 0.4s ease;
}

#preview-section.show {
    grid-template-rows: 1fr;
    opacity: 1;
    padding: 1.5rem;
}

.panel-inner {
    min-height: 0;
    overflow: hidden;
}

/* PA Group — smooth reveal */
#pa-group {
    display: grid;
    grid-template-rows: 0fr;
    overflow: hidden;
    transition: grid-template-rows 0.3s ease;
    margin-bottom: 0;
    gap: 0;
}

#pa-group.show {
    grid-template-rows: 1fr;
    margin-bottom: 1.5rem;
}

.pa-group__inner {
    min-height: 0;
    overflow: clip;
    overflow-clip-margin: 3px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

/* Details / Summary */
details {
    margin-bottom: 1.5rem;
    content-visibility: auto;
    contain-intrinsic-size: auto 2rem;
}

summary {
    font-family: var(--font-ui);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--color-falu-red);
    padding: 0.25rem 0;
}

@media (hover: hover) {
    summary:hover {
        color: var(--color-ink);
    }
}

details .doc-content {
    font-size: 0.9rem;
    margin-top: 0.75rem;
    padding-left: 0.5rem;
    border-left: 2px solid var(--color-stone);
    opacity: 1;
    transform: translateY(0);
    transition: opacity 0.3s ease, transform 0.3s ease;
}

@starting-style {
    details[open] .doc-content {
        opacity: 0;
        transform: translateY(-4px);
    }
}

details .doc-content h3 {
    font-size: 0.85rem;
    text-transform: none;
    letter-spacing: normal;
    color: var(--color-ink);
    border-bottom: none;
    margin: 1rem 0 0.25rem 0;
}

details .doc-content h3:first-child {
    margin-top: 0;
}

details .doc-content ul {
    margin: 0.25rem 0 0.5rem 0;
    padding-left: 1.25rem;
}

details .doc-content li {
    font-size: 0.85rem;
    line-height: 1.5;
}

details .doc-content ol {
    margin: 0.25rem 0 0.5rem 0;
    padding-left: 1.25rem;
}

kbd {
    font-family: var(--font-mono);
    font-size: 0.8em;
    font-size-adjust: 0.52;
    padding: 0.1em 0.4em;
    border: 1px solid var(--color-stone);
    border-radius: 3px;
    background: var(--color-kbd-bg);
}

/* Progressive: drop zone subtly shifts after files are loaded */
.drop-zone:has(.file-count:not(:empty)) {
    border-style: solid;
    border-color: var(--color-stone);
}

.drop-zone:has(.file-count:not(:empty)) .drop-zone__prompt {
    color: var(--color-stone);
}

.drop-zone:has(.file-count:not(:empty)) .drop-zone__hint {
    display: none;
}

/* Progressive: staggered chip entrance (Chrome + Safari, not yet Baseline) */
@supports (animation-delay: calc(sibling-index() * 1ms)) {
    .profile-chip {
        animation: chip-enter 0.2s ease backwards;
        animation-delay: calc(sibling-index() * 40ms);
    }

    @keyframes chip-enter {
        from { opacity: 0; transform: translateY(4px); }
    }
}

/* Disclaimer footer */
.disclaimer {
    width: 100%;
    max-width: 640px;
    margin-top: 0.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--color-stone);
}

.disclaimer p {
    font-family: var(--font-ui);
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--color-ink);
    opacity: 0.7;
    margin: 0;
    text-wrap: balance;
}

.disclaimer strong {
    color: var(--color-falu-red);
    opacity: 1;
}

.disclaimer a {
    text-decoration: underline;
}

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

/* Print: strip interactive chrome, show content */
@media print {
    body { padding: 0; }
    .drop-zone, #download-btn, .profile-chips, summary, .disclaimer { display: none; }
    #preview-section:not(.show) { display: none; }
    #preview-section.show { display: block; opacity: 1; overflow: visible; border: none; padding: 0; }
    .panel-inner { overflow: visible; }
    .notice { border-left: none; padding-left: 0; }
    details { display: none; }
    details[open] { display: block; }
    details[open] summary { display: none; }
}