:root {
    --primary-color: #0f62fe;
    --primary-hover: #3b82ff;
    --secondary-color: #3b485f;
    --secondary-hover: #52627d;
    --accent-color: #22d3ee;
    --accent-soft: rgba(34, 211, 238, 0.18);
    --surface-color: rgba(255, 255, 255, 0.8);
    --surface-strong: rgba(255, 255, 255, 0.92);
    --border-color: rgba(109, 128, 162, 0.22);
    --text-color: #10203a;
    --muted-text: #5e6c84;
    --shadow-soft: 0 20px 45px rgba(15, 35, 95, 0.12);
    --shadow-strong: 0 18px 50px rgba(15, 98, 254, 0.18);
    --page-glow-1: rgba(15, 98, 254, 0.2);
    --page-glow-2: rgba(34, 211, 238, 0.18);

    --dark-bg: #121212;
    --dark-text: #e0e0e0;
    --dark-fieldset-bg: #1e1e1e;
    --dark-border: #333;
    --dark-code-bg: #2d2d2d;
    --dark-log-bg: #2a2a2a;
    --dark-input-bg: #2d2d2d;
    --dark-input-text: #e0e0e0;
}

body {
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: var(--text-color);
    background:
        radial-gradient(circle at top left, var(--page-glow-1), transparent 32%),
        radial-gradient(circle at top right, var(--page-glow-2), transparent 28%),
        linear-gradient(135deg, #eef5ff 0%, #f6fbff 45%, #f8f9fd 100%);
    min-height: 100vh;
    position: relative;
}

body::before,
body::after {
    content: "";
    position: fixed;
    inset: auto;
    width: 42vw;
    height: 42vw;
    border-radius: 50%;
    pointer-events: none;
    filter: blur(60px);
    opacity: 0.45;
    z-index: 0;
}

body::before {
    top: -12vw;
    right: -10vw;
    background: rgba(15, 98, 254, 0.12);
}

body::after {
    bottom: -14vw;
    left: -8vw;
    background: rgba(34, 211, 238, 0.1);
}

button {
    padding: 0.5rem 0.95rem;
    border: 1px solid transparent;
    border-radius: 8px;
    margin-bottom: 5px;
    white-space: nowrap;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
    box-shadow: 0 10px 20px rgba(16, 32, 58, 0.08);
    backdrop-filter: blur(8px);
}

button:hover {
    transform: translateY(-1px);
}

button:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    box-shadow: none;
}

button.primary {
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color), #2388ff);
    box-shadow: 0 12px 24px rgba(15, 98, 254, 0.28);
}

button.primary:hover {
    color: #fff;
    border-color: rgba(255, 255, 255, 0.3);
    background: linear-gradient(135deg, var(--primary-hover), #45c3ff);
    box-shadow: 0 16px 30px rgba(15, 98, 254, 0.34);
}

button.secondary {
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.72);
    border-color: rgba(109, 128, 162, 0.22);
}

button.secondary:hover {
    color: var(--text-color);
    border-color: rgba(59, 72, 95, 0.24);
    background: rgba(255, 255, 255, 0.95);
}

h3 {
    padding: 1.6rem 0 1rem;
    margin: 0 0 1.25rem;
    border-bottom: 1px solid rgba(131, 149, 186, 0.26);
    text-align: center;
    font-size: clamp(1.5rem, 2vw, 2rem);
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #0f1f44;
    text-shadow: 0 10px 25px rgba(15, 98, 254, 0.12);
}

fieldset {
    border: none;
    box-shadow: var(--shadow-soft);
    background: linear-gradient(180deg, var(--surface-strong), var(--surface-color));
    padding: 16px 16px 12px;
    margin-bottom: 18px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

fieldset::before {
    content: "";
    position: absolute;
    inset: 0 auto auto 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(34, 211, 238, 0.65), transparent);
    opacity: 0.85;
}

fieldset legend {
    font-weight: bold;
    color: #1862d9;
    padding: 0 10px;
    font-size: 0.95rem;
    letter-spacing: 0.08em;
}

code {
    padding: .2em .4em;
    margin: 0;
    font-size: 85%;
    background: #ccc;
    border-radius: 3px;
}

input[type=text],
textarea,
input[type=date],
input[type=number],
select {
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-color);
    border: 1px solid rgba(121, 140, 176, 0.26);
    border-radius: 6px;
    padding: .45rem .85rem;
    max-width: 100%;
    box-sizing: border-box;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.6);
    transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
}

input[type=file] {
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    color: var(--text-color);
    max-width: 100%;
}

input::file-selector-button {
    font-size: 0.9rem;
    font-weight: 600;
    line-height: 1.5;
    border: 1px solid rgba(121, 140, 176, 0.26);
    border-radius: 8px;
    cursor: pointer;
    padding: 0.45rem 0.95rem;
    margin-right: 10px;
    color: var(--text-color);
    background: rgba(255, 255, 255, 0.9);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

input::file-selector-button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 20px rgba(16, 32, 58, 0.08);
}

select {
    padding: .45rem 2.25rem .45rem .85rem;
}

input:focus,
textarea:focus,
select:focus {
    border: 1px solid rgba(15, 98, 254, 0.55);
    box-shadow: 0 0 0 4px rgba(15, 98, 254, 0.14);
    outline: 0;
    background: #fff;
}

input[type=text]:disabled,
textarea:disabled,
input[type=date]:disabled,
input[type=number]:disabled,
select:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    background-color: #e9ecef;
    color: #6c757d;
}

label {
    margin-right: 4px;
    white-space: nowrap;
    color: var(--muted-text);
    font-weight: 600;
}

.main {
    width: 100%;
    max-width: 950px;
    margin: 0 auto;
    padding: 0 1rem 1.5rem;
    background: transparent;
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    box-sizing: border-box;
    position: relative;
    z-index: 1;
}

.footer {
    display: flex;
    gap: 10px;
    font-size: 0.8rem;
    color: var(--muted-text);
    flex-wrap: wrap;
    margin: 1rem 0 2rem;
    justify-content: center;
}

.footer .links {
    display: flex;
    align-items: center;
}

.footer .links a {
    color: var(--muted-text);
    text-decoration: none;
    position: relative;
    padding: 0 8px;
}

.footer .links a:first-child {
    padding-left: 0;
}

.footer .links a:not(:last-child)::after {
    content: "•";
    position: absolute;
    right: -4px;
    color: #999;
}

.footer a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

.flex-container {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.flex-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
}

.flex-group.right {
    margin-left: auto;
}

.debug {
    display: none !important;
}

.log-container {
    width: 100%;
    min-height: 100px;
    max-height: 300px;
    margin: 0;
    padding: 10px 12px;
    background: linear-gradient(180deg, rgba(14, 26, 48, 0.92), rgba(20, 36, 63, 0.96));
    color: #d9ecff;
    overflow-y: auto;
    overflow-x: hidden;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
    box-sizing: border-box;
    word-break: break-word;
    border-radius: 16px;
    border: 1px solid rgba(77, 102, 150, 0.4);
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.log-container .log-line {
    padding: 2px 0;
}

.log-container .time,
.log-container .action {
    display: inline-block;
    white-space: nowrap;
}

.log-container .time {
    color: #7bdcff;
    margin-right: 0.5em;
}

.log-container .action {
    color: #95aecd;
    margin-right: 0.5em;
}

.template-panel {
    border: 1px solid rgba(121, 140, 176, 0.22);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.78);
    padding: 12px;
    margin-bottom: 10px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.55);
}

.panel-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 10px;
}

.panel-tab {
    color: var(--muted-text);
    background: rgba(255, 255, 255, 0.7);
    border-color: rgba(121, 140, 176, 0.18);
}

.panel-tab:hover {
    background: rgba(255, 255, 255, 0.96);
    border-color: rgba(121, 140, 176, 0.26);
}

.panel-tab.active {
    color: #fff;
    background: linear-gradient(135deg, var(--primary-color), #1ec8ff);
    border-color: transparent;
    box-shadow: 0 12px 24px rgba(15, 98, 254, 0.2);
}

.panel-tab-content {
    display: none;
}

.panel-tab-content.active {
    display: block;
}

.template-header {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: baseline;
    margin-bottom: 10px;
}

.template-header span {
    color: var(--muted-text);
    font-size: 0.9rem;
}

.template-mode-panel {
    margin-top: 10px;
}

.template-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.template-item {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    align-items: center;
    padding: 8px;
    border: 1px solid rgba(121, 140, 176, 0.18);
    border-radius: 6px;
    background: rgba(248, 251, 255, 0.86);
}

.template-item.dragging {
    opacity: 0.55;
}

.template-item.drag-over {
    border-color: rgba(15, 98, 254, 0.5);
    box-shadow: inset 0 0 0 1px rgba(15, 98, 254, 0.18);
}

.countdown-grid-drag-handle {
    width: 34px;
    height: 34px;
    border: 1px dashed rgba(121, 140, 176, 0.4);
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.92);
    color: var(--muted-text);
    cursor: grab;
    flex: 0 0 auto;
}

.countdown-grid-drag-handle:active {
    cursor: grabbing;
}

.template-item input[type="text"] {
    min-width: 120px;
    flex: 1 1 160px;
}

.template-item input[type="date"] {
    min-width: 150px;
}

.template-item input[type="number"] {
    width: 72px;
}

.template-item label {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.canvas-container canvas {
    border: 1px solid rgba(37, 61, 104, 0.24);
    max-width: 100%;
    height: auto;
    display: block;
    margin: 0 auto;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(245, 249, 255, 0.98));
    border-radius: 0;
    box-shadow:
        0 25px 60px rgba(15, 35, 95, 0.18),
        inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

.canvas-frame {
    position: relative;
    width: fit-content;
    max-width: 100%;
    margin: 0 auto;
}

.canvas-frame canvas {
    margin: 0;
}

.region-overlay {
    position: absolute;
    inset: 0;
    display: none;
    pointer-events: none;
}

.region-overlay.active {
    display: block;
}

.region-box {
    position: absolute;
    box-sizing: border-box;
    border: 2px solid #e53935;
    background: rgba(229, 57, 53, 0.12);
    cursor: move;
    pointer-events: auto;
    touch-action: none;
}

.region-box::after {
    content: "";
    position: absolute;
    right: -6px;
    bottom: -6px;
    width: 12px;
    height: 12px;
    border: 2px solid #fff;
    background: #e53935;
    box-shadow: 0 2px 8px rgba(30, 41, 59, 0.28);
    cursor: nwse-resize;
}

.region-label {
    position: absolute;
    left: -2px;
    top: -22px;
    min-width: 22px;
    padding: 2px 6px;
    border-radius: 4px 4px 0 0;
    background: #e53935;
    color: #fff;
    font-size: 12px;
    line-height: 16px;
    text-align: center;
    pointer-events: none;
}

.canvas-container.crop-mode canvas {
    border: 2px dashed var(--primary-color);
    cursor: grab;
}

.status-bar {
    display: none;
    font-size: 85%;
    color: var(--muted-text);
    margin-bottom: 10px;
    padding-bottom: 10px;
    border-bottom: 1px dotted rgba(121, 140, 176, 0.45);
}

canvas.text-placement-mode {
    border: 2px dashed var(--primary-color) !important;
    cursor: text !important;
}

.canvas-title {
    display: none;
    text-align: center;
    margin-bottom: 5px;
    color: var(--primary-color);
}

.canvas-container {
    padding: 18px;
    border-radius: 0;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.74), rgba(242, 248, 255, 0.84));
    border: 1px solid rgba(121, 140, 176, 0.18);
    box-shadow: var(--shadow-soft);
}

.canvas-tools {
    margin-top: 10px;
    justify-content: center;
}

.brush-tools,
.text-tools,
.crop-tools {
    display: none;
}

.markdown-text-input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: 240px;
    flex: 1 1 280px;
}

#text-input {
    width: 100%;
    min-height: 110px;
    resize: vertical;
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

.markdown-text-hint {
    color: var(--muted-text);
    font-size: 0.82rem;
    line-height: 1.4;
}

.canvas-container.brush-mode .brush-tools,
.canvas-container.text-mode .brush-tools,
.canvas-container.eraser-mode .brush-tools,
.canvas-container.text-mode .text-tools,
.canvas-container.crop-mode .crop-tools {
    display: flex;
}

.canvas-container.crop-mode .tool-buttons,
.canvas-container.crop-mode .brush-tools,
.canvas-container.crop-mode .text-tools {
    display: none;
}

.tool-button {
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 5px;
    background: rgba(255, 255, 255, 0.86);
    border: 1px solid rgba(121, 140, 176, 0.22);
    border-radius: 4px;
    padding: 0;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 8px 18px rgba(16, 32, 58, 0.08);
}

.tool-button:hover {
    background: #fff;
    border-color: rgba(121, 140, 176, 0.3);
}

.tool-button.active {
    background: linear-gradient(135deg, var(--primary-color), #1ec8ff);
    color: white;
    border-color: transparent;
    box-shadow: 0 12px 24px rgba(15, 98, 254, 0.24);
}

.tool-button.hide {
    display: none;
}

@media (max-width: 768px) {
    .flex-container {
        flex-direction: column;
    }

    .panel-tabs {
        flex-direction: row;
    }

    .panel-tab {
        flex: 1 1 0;
        text-align: center;
    }

    .flex-container.options .flex-group label {
        min-width: 80px;
    }

    .flex-group.right {
        margin-left: 0;
    }

    .canvas-tools.flex-container {
        flex-direction: row;
        flex-wrap: wrap;
        justify-content: center;
    }

    .canvas-tools .flex-group {
        justify-content: center;
        width: 100%;
    }

    .log-container {
        height: 150px;
        margin-top: 10px;
    }

    fieldset {
        padding: 8px;
    }

    button {
        width: auto;
    }

    input[type=text],
    textarea,
    input[type=number],
    select {
        max-width: 100%;
        margin-bottom: 5px;
    }
}

body.dark-mode .debug {
    display: flex !important;
}

body.dark-mode,
body.dark-mode .main {
    background-color: var(--dark-bg);
    color: var(--dark-text);
}

body.dark-mode {
    background:
        radial-gradient(circle at top left, rgba(15, 98, 254, 0.16), transparent 32%),
        radial-gradient(circle at bottom right, rgba(34, 211, 238, 0.14), transparent 30%),
        linear-gradient(135deg, #0b1220 0%, #10192d 50%, #0c1220 100%);
}

body.dark-mode fieldset {
    background-color: var(--dark-fieldset-bg);
    box-shadow: 0 .5rem 0.5rem rgba(0, 0, 0, 0.5);
    border: 1px solid rgba(77, 102, 150, 0.24);
}

body.dark-mode h3 {
    border-bottom: 1px solid var(--dark-border);
    color: var(--dark-text);
    text-shadow: 0 12px 30px rgba(34, 211, 238, 0.12);
}

body.dark-mode code {
    background: var(--dark-code-bg);
    color: #ff9800;
}

body.dark-mode input[type=text],
body.dark-mode textarea,
body.dark-mode input[type=date],
body.dark-mode input[type=number],
body.dark-mode select {
    background-color: var(--dark-input-bg);
    color: var(--dark-input-text);
    border-color: var(--dark-border);
}

body.dark-mode input[type=text]:disabled,
body.dark-mode textarea:disabled,
body.dark-mode input[type=date]:disabled,
body.dark-mode input[type=number]:disabled,
body.dark-mode select:disabled {
    background-color: #1a1a1a;
    color: #666;
    border-color: #2a2a2a;
}

body.dark-mode input[type=file] {
    color: var(--dark-input-text);
    background-color: transparent;
    border-color: var(--dark-border);
}

body.dark-mode input[type=file]::file-selector-button {
    background-color: var(--dark-fieldset-bg);
    color: var(--dark-input-text);
    border-color: var(--dark-border);
}

body.dark-mode input[type=file]::file-selector-button:hover {
    background-color: #333;
    border-color: #444;
}

body.dark-mode .log-container {
    background: var(--dark-log-bg);
    border: 1px solid var(--dark-border);
}

body.dark-mode .log-container .time {
    color: #8bc34a;
}

body.dark-mode .log-container .action {
    color: #03a9f4;
}

body.dark-mode fieldset legend {
    color: #64b5f6;
}

body.dark-mode .footer .links a:not(:last-child)::after {
    color: #666;
}

body.dark-mode .footer {
    color: #999;
}

body.dark-mode .footer a {
    color: #999;
}

body.dark-mode .footer a:hover {
    color: #64b5f6;
}

body.dark-mode .tool-button {
    background-color: var(--dark-input-bg);
    border-color: var(--dark-border);
    color: var(--dark-text);
}

body.dark-mode .tool-button:hover {
    background-color: #3a3a3a;
    border-color: #444;
}

body.dark-mode .tool-button.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-hover);
}

body.dark-mode .template-panel,
body.dark-mode .template-item {
    background-color: var(--dark-fieldset-bg);
    border-color: var(--dark-border);
}

body.dark-mode .canvas-container {
    background: linear-gradient(180deg, rgba(23, 31, 49, 0.92), rgba(17, 24, 39, 0.95));
    border-color: rgba(77, 102, 150, 0.24);
}

body.dark-mode .canvas-container canvas {
    background: #f8fbff;
}

body.dark-mode .panel-tab {
    color: var(--dark-text);
    background-color: #2a2a2a;
    border-color: var(--dark-border);
}

body.dark-mode .panel-tab:hover {
    background-color: #333;
    border-color: #444;
}

body.dark-mode .panel-tab.active {
    background-color: var(--primary-color);
    border-color: var(--primary-hover);
    color: #fff;
}

body.dark-mode .template-header span {
    color: #aaa;
}

@media (prefers-reduced-motion: no-preference) {
    fieldset,
    .canvas-container {
        animation: floatIn 0.6s ease both;
    }

    fieldset:nth-of-type(2) {
        animation-delay: 0.06s;
    }

    fieldset:nth-of-type(3) {
        animation-delay: 0.12s;
    }
}

@keyframes floatIn {
    from {
        opacity: 0;
        transform: translateY(16px);
    }

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