/* ============================================================
   PURECOLOR · 色刊
   Editorial design system — 杂志编辑体
   Paper / ink / hairline rules / one vermilion accent
   ============================================================ */

:root {
    /* --- Editorial palette --- */
    --paper: #F7F3E9;
    --paper-2: #EFE7D5;
    --paper-3: #E6DCC6;
    --ink: #17140F;
    --ink-2: #57503F;
    --ink-3: #8A8069;
    --rule: #DBD2BC;
    --accent: #B23A1F;

    /* --- Legacy tokens kept for the chapter pages --- */
    --primary: #B23A1F;
    --primary-hover: #93301A;
    --secondary: #8A8069;
    --surface: #F2ECDD;
    --surface-hover: #EAE1CD;
    --glass-border: #DBD2BC;
    --text-main: #17140F;
    --text-muted: #57503F;
    --bg-gradient: #F7F3E9;
    --radius-lg: 2px;
    --radius-md: 2px;
    --radius-sm: 2px;
    --shadow-soft: 0 0 0 0 rgba(0, 0, 0, 0);
    --shadow-hover: 0 0 0 0 rgba(0, 0, 0, 0);

    /* --- Type --- */
    --serif: "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", Baskerville, Georgia, serif;
    --sans: "PingFang SC", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --mono: "SF Mono", Menlo, "JetBrains Mono", "Courier New", monospace;

    /* --- Rhythm --- */
    --page: 1220px;
    --gutter: 40px;
}

[data-theme="dark"] {
    --paper: #14120E;
    --paper-2: #1B1813;
    --paper-3: #241F18;
    --ink: #EDE6D7;
    --ink-2: #B3A992;
    --ink-3: #8A8069;
    --rule: #332E24;
    --accent: #D4553A;

    --primary: #D4553A;
    --primary-hover: #E4674C;
    --secondary: #8A8069;
    --surface: #1B1813;
    --surface-hover: #221D16;
    --glass-border: #332E24;
    --text-main: #EDE6D7;
    --text-muted: #B3A992;
    --bg-gradient: #14120E;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --paper: #14120E;
        --paper-2: #1B1813;
        --paper-3: #241F18;
        --ink: #EDE6D7;
        --ink-2: #B3A992;
        --ink-3: #8A8069;
        --rule: #332E24;
        --accent: #D4553A;

        --primary: #D4553A;
        --primary-hover: #E4674C;
        --secondary: #8A8069;
        --surface: #1B1813;
        --surface-hover: #221D16;
        --glass-border: #332E24;
        --text-main: #EDE6D7;
        --text-muted: #B3A992;
        --bg-gradient: #14120E;
    }
}

/* --- Reset & base --- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--sans);
    font-size: 16px;
    line-height: 1.7;
    background: var(--paper);
    color: var(--ink);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s ease, color 0.3s ease;
}

img {
    max-width: 100%;
    display: block;
}

button,
input {
    font-family: inherit;
    color: inherit;
}

button {
    cursor: pointer;
}

::selection {
    background: var(--accent);
    color: var(--paper);
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

/* Sub-pages keep using .container; keep it neutral */
.container {
    width: 100%;
    max-width: var(--page);
    margin: 0 auto;
}

/* ============================================================
   Masthead
   ============================================================ */
.page {
    width: 100%;
    max-width: var(--page);
    margin: 0 auto;
    padding: 0 var(--gutter) 0;
}

.masthead {
    padding-top: 30px;
}

.mast-row {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: baseline;
    gap: 24px;
    padding-bottom: 16px;
}

.wordmark {
    display: flex;
    align-items: baseline;
    gap: 10px;
    text-decoration: none;
    color: var(--ink);
}

.wm-en {
    font-family: var(--serif);
    font-size: 27px;
    font-weight: 600;
    letter-spacing: -0.01em;
    line-height: 1;
}

.wm-cn {
    font-family: var(--serif);
    font-size: 13px;
    letter-spacing: 0.34em;
    color: var(--ink-3);
    padding-left: 10px;
    border-left: 1px solid var(--rule);
}

.issue {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--ink-3);
    display: flex;
    gap: 14px;
    align-items: baseline;
    white-space: nowrap;
}

.issue em {
    font-style: normal;
    color: var(--accent);
}

.tools {
    display: flex;
    gap: 4px;
    align-items: center;
}

.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: 1px solid transparent;
    border-radius: 2px;
    background: transparent;
    color: var(--ink);
    transition: border-color 0.15s ease, background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
    border-color: var(--rule);
    background: var(--paper-2);
}

/* contents strip */
.mast-nav {
    display: flex;
    align-items: baseline;
    gap: 30px;
    border-top: 1px solid var(--ink);
    border-bottom: 1px solid var(--rule);
    padding: 11px 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.mast-nav::-webkit-scrollbar {
    display: none;
}

.nav-label {
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ink-3);
    flex: none;
}

.nav-link {
    font-size: 13px;
    color: var(--ink-2);
    text-decoration: none;
    white-space: nowrap;
    display: inline-flex;
    align-items: baseline;
    gap: 7px;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
    transition: color 0.15s ease, border-color 0.15s ease;
}

.nav-link i {
    font-family: var(--mono);
    font-style: normal;
    font-size: 9.5px;
    color: var(--ink-3);
    letter-spacing: 0.08em;
}

.nav-link:hover {
    color: var(--ink);
    border-bottom-color: var(--ink);
}

.nav-link.current {
    color: var(--ink);
    border-bottom-color: var(--accent);
}

.nav-link.current i {
    color: var(--accent);
}

/* dropdown index (mobile / quick access) */
.dropdown-menu {
    position: fixed;
    top: 74px;
    right: 24px;
    min-width: 210px;
    padding: 6px;
    background: var(--paper);
    border: 1px solid var(--ink);
    display: none;
    flex-direction: column;
    z-index: 1000;
    opacity: 0;
    transform: translateY(-6px);
    transition: opacity 0.18s ease, transform 0.18s ease;
    box-shadow: 6px 6px 0 rgba(23, 20, 15, 0.1);
}

.dropdown-menu.show {
    display: flex;
    opacity: 1;
    transform: translateY(0);
}

.menu-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 12px;
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--rule);
    color: var(--ink);
    font-size: 13.5px;
    text-align: left;
    transition: background 0.15s ease;
}

.menu-item:last-child {
    border-bottom: 0;
}

.menu-item:hover {
    background: var(--paper-2);
}

.menu-item svg {
    color: var(--ink-3);
    flex-shrink: 0;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
    display: grid;
    grid-template-columns: 1.45fr 0.75fr;
    gap: 64px;
    padding: 62px 0 58px;
    border-bottom: 1px solid var(--ink);
}

.kicker {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.26em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 26px;
}

.hero h1 {
    font-family: var(--serif);
    font-weight: 600;
    font-size: clamp(46px, 6.6vw, 88px);
    line-height: 1.0;
    letter-spacing: -0.025em;
    margin-bottom: 24px;
}

.hero h1 span {
    display: block;
    margin-top: 0.16em;
    font-size: 0.56em;
    letter-spacing: 0.06em;
    line-height: 1.25;
    color: var(--ink-3);
}

.dek {
    font-size: 15.5px;
    line-height: 1.95;
    color: var(--ink-2);
    max-width: 30em;
    margin-bottom: 34px;
}

.cta-row {
    display: flex;
    align-items: center;
    gap: 22px;
    flex-wrap: wrap;
}

.cta-note {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.12em;
    color: var(--ink-3);
    text-transform: uppercase;
}

/* Buttons — square, ruled, mono */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 14px 26px;
    border: 1px solid var(--ink);
    border-radius: 0;
    background: transparent;
    color: var(--ink);
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    line-height: 1;
    transition: background 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn svg {
    width: 16px;
    height: 16px;
}

.btn:hover {
    background: var(--paper-2);
}

.btn-solid {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
}

.btn-solid:hover {
    background: var(--accent);
    border-color: var(--accent);
    color: #FFF8EF;
}

.btn-ghost {
    border-color: var(--rule);
    color: var(--ink-2);
}

.btn-ghost:hover {
    border-color: var(--ink);
    color: var(--ink);
    background: transparent;
}

.btn-sm {
    padding: 9px 14px;
    font-size: 9.5px;
    letter-spacing: 0.14em;
}

.btn:disabled {
    opacity: 0.38;
    cursor: not-allowed;
}

/* Hero side — 本期提要 */
.hero-side {
    border-left: 1px solid var(--rule);
    padding-left: 34px;
    align-self: start;
}

.side-label {
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--ink-3);
    padding-bottom: 12px;
    border-bottom: 1px solid var(--rule);
    margin-bottom: 18px;
}

.steps {
    list-style: none;
}

.steps li {
    display: grid;
    grid-template-columns: 34px 1fr;
    gap: 10px;
    align-items: baseline;
    padding: 13px 0;
    border-bottom: 1px dotted var(--rule);
    font-size: 13.5px;
    color: var(--ink-2);
}

.steps li:last-child {
    border-bottom: 0;
}

.steps b {
    font-family: var(--mono);
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 0.1em;
    color: var(--accent);
}

.colophon-note {
    font-family: var(--mono);
    font-size: 10px;
    line-height: 1.9;
    letter-spacing: 0.04em;
    color: var(--ink-3);
    margin-top: 22px;
    padding-top: 16px;
    border-top: 1px solid var(--rule);
}

/* ============================================================
   空状态 — 版面草图
   ============================================================ */
.dummy {
    display: grid;
    grid-template-columns: 1.15fr 0.95fr 0.5fr;
    gap: 44px;
    padding: 34px 0 10px;
}

.dummy-cell {
    border: 1px dashed var(--rule);
    min-height: 150px;
    padding: 14px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: var(--ink-3);
    background: repeating-linear-gradient(135deg, transparent 0 9px, rgba(219, 210, 188, 0.18) 9px 10px);
}

.dummy-cell span {
    font-family: var(--serif);
    font-size: 15px;
    letter-spacing: 0.16em;
    color: var(--ink-2);
}

.dummy-cell i {
    font-family: var(--mono);
    font-style: normal;
    font-size: 9px;
    letter-spacing: 0.24em;
    text-transform: uppercase;
}

.dummy-cell:nth-child(3) {
    min-height: 230px;
}

.dummy-note {
    grid-column: 1 / -1;
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-3);
    padding-top: 6px;
}

/* ============================================================
   Workspace
   ============================================================ */
.workspace {
    display: grid;
    grid-template-columns: 1fr 0.9fr 0.66fr;
    gap: 44px;
    align-items: start;
    padding: 56px 0 10px;
    opacity: 0;
    transform: translateY(14px);
    transition: opacity 0.45s ease, transform 0.45s ease;
}

.workspace.active {
    opacity: 1;
    transform: translateY(0);
}

/* figure */
.figure {
    border-top: 1px solid var(--ink);
    padding-top: 14px;
    position: sticky;
    top: 24px;
}

.figure-img {
    background: var(--paper-2);
    padding: 14px;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 220px;
}

#previewImage {
    max-height: 560px;
    width: auto;
    box-shadow: 0 1px 0 var(--rule);
}

.figure figcaption {
    display: flex;
    gap: 10px;
    align-items: baseline;
    margin-top: 12px;
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--ink-3);
}

.figure figcaption span {
    color: var(--accent);
}

/* palette */
.palette {
    border-top: 1px solid var(--ink);
    padding-top: 14px;
}

.palette-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 6px;
}

.palette-head h2 {
    font-family: var(--serif);
    font-size: 21px;
    font-weight: 600;
    letter-spacing: 0.02em;
    display: flex;
    align-items: baseline;
    gap: 10px;
}

.palette-head h2::after {
    content: "";
    display: block;
    width: 34px;
    height: 3px;
    background: var(--dominant, var(--accent));
    transform: translateY(-4px);
}

/* color rows */
.colors-list {
    display: flex;
    flex-direction: column;
}

.color-item {
    display: grid;
    grid-template-columns: 52px 1fr auto;
    align-items: center;
    gap: 14px;
    padding: 10px 8px 10px 0;
    border-bottom: 1px solid var(--rule);
    cursor: pointer;
    position: relative;
    transition: background 0.15s ease, padding-left 0.15s ease;
}

.color-item:hover {
    background: var(--paper-2);
    padding-left: 8px;
}

.color-item.selected {
    padding-left: 8px;
    background: var(--paper-2);
}

.color-item.selected::before {
    content: "";
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--ink);
}

.color-swatch {
    width: 52px;
    height: 52px;
    border-radius: 0;
    box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.14);
}

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

.color-hex {
    font-family: var(--mono);
    font-size: 14px;
    letter-spacing: 0.06em;
    font-weight: 500;
}

.color-meta {
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.06em;
    color: var(--ink-3);
}

.save-color-btn {
    background: transparent;
    border: 1px solid transparent;
    border-radius: 0;
    padding: 7px;
    opacity: 0;
    color: var(--ink-2);
    transition: opacity 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.color-item:hover .save-color-btn,
.color-item:focus-within .save-color-btn {
    opacity: 1;
}

.save-color-btn:hover {
    color: var(--ink);
    border-color: var(--rule);
}

/* actions */
.actions-area {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-top: 26px;
}

.actions-area .btn {
    width: 100%;
}

.custom-row {
    display: grid;
    grid-template-columns: 22px 1fr auto;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border: 1px solid var(--rule);
    background: var(--paper-2);
}

.preview-dot {
    width: 22px;
    height: 22px;
    border-radius: 0;
    border: 1px solid rgba(0, 0, 0, 0.18);
}

#customColorInput {
    flex: 1;
    border: 0;
    background: transparent;
    font-family: var(--mono);
    font-size: 12.5px;
    letter-spacing: 0.08em;
    padding: 2px 0;
    outline: none;
    min-width: 0;
}

#customColorInput::placeholder {
    color: var(--ink-3);
    letter-spacing: 0.14em;
}

.custom-row .btn {
    padding: 7px 12px;
    font-size: 9.5px;
}

/* wallpaper stage */
.stage-wrap {
    position: sticky;
    top: 24px;
    border-top: 1px solid var(--ink);
    padding-top: 14px;
}

.stage {
    position: relative;
    aspect-ratio: 9 / 16;
    width: 100%;
    background: var(--paper-2);
    border: 1px solid var(--rule);
    overflow: hidden;
    transition: background 0.4s ease;
}

.stage::after {
    content: "9:16";
    position: absolute;
    right: 8px;
    bottom: 6px;
    font-family: var(--mono);
    font-size: 8.5px;
    letter-spacing: 0.18em;
    color: rgba(255, 255, 255, 0.65);
    mix-blend-mode: difference;
}

.stage-note {
    font-family: var(--mono);
    font-size: 9.5px;
    line-height: 1.8;
    letter-spacing: 0.04em;
    color: var(--ink-3);
    margin-top: 12px;
}

/* ============================================================
   拖拽上传遮罩
   ============================================================ */
.drop-overlay {
    position: fixed;
    inset: 0;
    z-index: 9000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: rgba(247, 243, 233, 0.94);
}

[data-theme="dark"] .drop-overlay {
    background: rgba(20, 18, 14, 0.94);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .drop-overlay {
        background: rgba(20, 18, 14, 0.94);
    }
}

body.is-dragging .drop-overlay {
    display: flex;
}

body.is-dragging {
    overflow: hidden;
}

.drop-frame {
    width: 100%;
    max-width: 560px;
    border: 2px dashed var(--ink);
    padding: 62px 48px;
    text-align: center;
    animation: dropIn 0.18s ease-out;
}

.drop-kicker {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 18px;
}

.drop-title {
    font-family: var(--serif);
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 600;
    letter-spacing: -0.01em;
    margin-bottom: 16px;
}

.drop-note {
    font-family: var(--mono);
    font-size: 10px;
    letter-spacing: 0.14em;
    color: var(--ink-3);
}

@keyframes dropIn {
    from {
        opacity: 0;
        transform: scale(0.98);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ============================================================
   Toast
   ============================================================ */
.toast-tooltip {
    position: fixed;
    left: 50%;
    bottom: 34px;
    transform: translate(-50%, 12px);
    background: var(--ink);
    color: var(--paper);
    padding: 12px 20px;
    border-radius: 0;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.1em;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 10000;
    pointer-events: none;
}

.toast-tooltip.show {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

/* ============================================================
   Footer colophon
   ============================================================ */
.colophon-bar {
    margin-top: 64px;
    padding: 20px 0 46px;
    border-top: 1px solid var(--ink);
    display: flex;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
    font-family: var(--mono);
    font-size: 9.5px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--ink-3);
}

.colophon-bar b {
    color: var(--ink-2);
    font-weight: 400;
}

/* ============================================================
   Animation
   ============================================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

.stage.is-gradient {
    background-size: 400% 400% !important;
    animation: gradientShift 15s ease infinite;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1080px) {
    :root {
        --gutter: 28px;
    }

    .workspace {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }

    .dummy {
        grid-template-columns: 1fr 1fr;
        gap: 36px;
    }

    .dummy-cell:nth-child(3) {
        display: none;
    }

    .stage-wrap {
        grid-column: 1 / -1;
        position: static;
        display: grid;
        grid-template-columns: 148px 1fr;
        gap: 22px;
        align-items: start;
        border-top: 1px solid var(--rule);
        padding-top: 18px;
    }

    .stage {
        width: 148px;
    }

    .stage-wrap .side-label {
        margin-bottom: 10px;
    }
}

@media (max-width: 860px) {
    .mast-row {
        grid-template-columns: 1fr auto;
        row-gap: 8px;
    }

    .issue {
        grid-column: 1 / -1;
        order: 3;
        font-size: 9px;
    }

    .hero {
        grid-template-columns: 1fr;
        gap: 34px;
        padding: 42px 0 44px;
    }

    .hero-side {
        border-left: 0;
        padding-left: 0;
        border-top: 1px solid var(--rule);
        padding-top: 20px;
    }

    .workspace {
        grid-template-columns: 1fr;
        gap: 34px;
    }

    .dummy {
        grid-template-columns: 1fr 1fr;
        gap: 18px;
    }

    .dummy-cell {
        min-height: 110px;
    }

    .stage-wrap {
        grid-template-columns: 120px 1fr;
    }

    .stage {
        width: 120px;
    }

    .figure {
        position: static;
    }

    .figure-img {
        padding: 10px;
    }

    #previewImage {
        max-height: 420px;
    }
}

@media (max-width: 560px) {
    :root {
        --gutter: 18px;
    }

    .masthead {
        padding-top: 22px;
    }

    .wm-en {
        font-size: 22px;
    }

    .hero h1 {
        font-size: clamp(38px, 11vw, 52px);
    }

    .dek {
        font-size: 14.5px;
    }

    .mast-nav {
        gap: 18px;
    }

    .nav-label {
        display: none;
    }

    .step,
    .steps li {
        font-size: 13px;
    }

    .colophon-bar {
        flex-direction: column;
        gap: 8px;
    }
}

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}