/* ===== Theme tokens ===================================================== */
:root {
    --radius: 10px;
    --radius-sm: 6px;
    --gap: 18px;
    --font-mono: 'Fira Mono', 'JetBrains Mono', 'Consolas', 'Menlo', 'Monaco', monospace;
    --shadow: 0 10px 40px rgba(0, 0, 0, 0.55);
    --transition: 160ms cubic-bezier(.4, 0, .2, 1);
}

html[data-theme="matrix"] {
    --bg: #0c0f0e;
    --bg-grid: rgba(0, 255, 144, 0.04);
    --panel: #141a18;
    --panel-2: #1c2421;
    --panel-3: #0f1413;
    --accent: #00ff90;
    --accent-2: #ffe066;
    --accent-soft: rgba(0, 255, 144, 0.12);
    --accent-strong: #00cc73;
    --danger: #ff4d5e;
    --text: #d7ffe9;
    --text-dim: #6f8f80;
    --border: rgba(0, 255, 144, 0.28);
    --border-strong: rgba(0, 255, 144, 0.55);
    --on-accent: #06120c;
}

html[data-theme="cyan"] {
    --bg: #070b12;
    --bg-grid: rgba(56, 189, 248, 0.05);
    --panel: #101826;
    --panel-2: #16213a;
    --panel-3: #0b1220;
    --accent: #38bdf8;
    --accent-2: #a78bfa;
    --accent-soft: rgba(56, 189, 248, 0.14);
    --accent-strong: #0ea5e9;
    --danger: #fb7185;
    --text: #dbeafe;
    --text-dim: #6b829e;
    --border: rgba(56, 189, 248, 0.28);
    --border-strong: rgba(56, 189, 248, 0.55);
    --on-accent: #04121f;
}

html[data-theme="amber"] {
    --bg: #120d05;
    --bg-grid: rgba(255, 176, 0, 0.05);
    --panel: #1e1608;
    --panel-2: #291f0c;
    --panel-3: #150f05;
    --accent: #ffb000;
    --accent-2: #ff7043;
    --accent-soft: rgba(255, 176, 0, 0.13);
    --accent-strong: #e59400;
    --danger: #ff5252;
    --text: #ffe8c2;
    --text-dim: #a08355;
    --border: rgba(255, 176, 0, 0.28);
    --border-strong: rgba(255, 176, 0, 0.55);
    --on-accent: #1a1200;
}

html[data-theme="black"] {
    --bg: #000000;
    --bg-grid: rgba(255, 255, 255, 0.035);
    --panel: #0a0a0a;
    --panel-2: #151515;
    --panel-3: #050505;
    --accent: #ffffff;
    --accent-2: #b9b9b9;
    --accent-soft: rgba(255, 255, 255, 0.10);
    --accent-strong: #d4d4d4;
    --danger: #ff5b5b;
    --text: #f2f2f2;
    --text-dim: #8a8a8a;
    --border: rgba(255, 255, 255, 0.22);
    --border-strong: rgba(255, 255, 255, 0.45);
    --on-accent: #000000;
}

html[data-theme="white"] {
    --bg: #f4f5f7;
    --bg-grid: rgba(0, 0, 0, 0.04);
    --panel: #ffffff;
    --panel-2: #f0f1f4;
    --panel-3: #e8eaef;
    --accent: #111827;
    --accent-2: #4b5563;
    --accent-soft: rgba(17, 24, 39, 0.06);
    --accent-strong: #000000;
    --danger: #dc2626;
    --text: #1f2937;
    --text-dim: #6b7280;
    --border: rgba(17, 24, 39, 0.16);
    --border-strong: rgba(17, 24, 39, 0.34);
    --on-accent: #ffffff;
    --shadow: 0 10px 30px rgba(17, 24, 39, 0.12);
}

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

html, body { height: 100%; }

body {
    font-family: var(--font-mono);
    background:
        linear-gradient(var(--bg-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px),
        var(--bg);
    background-size: 100% 100%, 26px 26px, 26px 26px;
    min-height: 100vh;
    padding: clamp(10px, 2vw, 24px);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition), color var(--transition);
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    background: var(--panel);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    overflow: hidden;
}

/* ===== Header =========================================================== */
.header {
    background: var(--panel-3);
    padding: 16px clamp(14px, 3vw, 24px);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    flex-wrap: wrap;
}

.header .brand h1 {
    font-size: clamp(1.1em, 2.6vw, 1.5em);
    color: var(--accent-2);
    letter-spacing: .5px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.header .brand p {
    font-size: .82em;
    color: var(--text-dim);
    margin-top: 4px;
}

.theme-switch {
    display: flex;
    align-items: center;
    gap: 8px;
}

.theme-switch span {
    font-size: .75em;
    color: var(--text-dim);
}

.theme-dot {
    width: 26px;
    height: 26px;
    border-radius: 50%;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: transform var(--transition), border-color var(--transition);
    position: relative;
}

.theme-dot:hover { transform: scale(1.12); }
.theme-dot[aria-pressed="true"] { border-color: var(--text); transform: scale(1.12); }
.theme-dot[aria-pressed="true"]::after {
    content: '';
    position: absolute;
    inset: -6px;
    border: 1px solid currentColor;
    border-radius: 50%;
    opacity: .5;
}
.theme-dot.matrix { background: linear-gradient(135deg, #00ff90, #00994f); color: #00ff90; }
.theme-dot.cyan   { background: linear-gradient(135deg, #38bdf8, #a78bfa); color: #38bdf8; }
.theme-dot.amber  { background: linear-gradient(135deg, #ffb000, #ff7043); color: #ffb000; }
.theme-dot.black  { background: linear-gradient(135deg, #555, #000); color: #ffffff; }
.theme-dot.white  { background: linear-gradient(135deg, #ffffff, #cfd3da); color: #111827; }

/* ===== Notices ========================================================== */
.privacy-notice {
    background: var(--accent-soft);
    border-left: 3px solid var(--accent);
    padding: 12px 16px;
    margin: var(--gap);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: .86em;
    line-height: 1.5;
}
.privacy-notice strong { color: var(--accent-2); }

/* ===== Layout =========================================================== */
.main-content {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: var(--gap);
    padding: var(--gap);
}

.sidebar {
    background: var(--panel-2);
    padding: 16px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    height: fit-content;
    position: sticky;
    top: 16px;
    max-height: calc(100vh - 32px);
    overflow-y: auto;
}

.tool-section { margin-bottom: 22px; }
.tool-section:last-child { margin-bottom: 4px; }

.tool-section h3 {
    color: var(--accent-2);
    margin-bottom: 12px;
    font-size: .92em;
    border-bottom: 1px solid var(--border);
    padding-bottom: 6px;
    letter-spacing: .5px;
    text-transform: uppercase;
}

.upload-area {
    border: 2px dashed var(--border-strong);
    border-radius: var(--radius-sm);
    padding: 26px 14px;
    text-align: center;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
    background: var(--accent-soft);
    color: var(--text);
}
.upload-area:hover, .upload-area.dragover {
    background: var(--accent-soft);
    border-color: var(--accent-2);
}
.upload-area p:first-child { font-size: .95em; }
.upload-area .hint { font-size: .78em; color: var(--text-dim); margin-top: 8px; }

.tool-btn {
    width: 100%;
    padding: 10px 12px;
    margin: 6px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--panel-3);
    color: var(--text);
    font-size: .9em;
    cursor: pointer;
    transition: background var(--transition), color var(--transition), transform var(--transition), border-color var(--transition);
    font-weight: 600;
    font-family: inherit;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 8px;
}
.tool-btn:hover:not(:disabled) {
    background: var(--accent-soft);
    border-color: var(--accent);
    transform: translateX(2px);
}
.tool-btn.active {
    background: var(--accent);
    color: var(--on-accent);
    border-color: var(--accent);
    font-weight: 700;
}
.tool-btn:disabled { opacity: .35; cursor: not-allowed; transform: none; }

.btn-row { display: flex; gap: 8px; }
.btn-row .tool-btn { margin: 6px 0; }

input[type="text"], input[type="number"], select {
    width: 100%;
    padding: 8px 10px;
    margin: 6px 0;
    border: 1px solid var(--border);
    background: var(--panel-3);
    border-radius: var(--radius-sm);
    font-size: .85em;
    color: var(--text);
    font-family: inherit;
}
input[type="text"]:focus, input[type="number"]:focus, select:focus {
    outline: none;
    border-color: var(--accent-2);
    box-shadow: 0 0 0 2px var(--accent-soft);
}

input[type="range"] {
    width: calc(100% - 56px);
    margin: 8px 0;
    cursor: pointer;
    accent-color: var(--accent);
    vertical-align: middle;
}

.color-preview {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 6px 0;
    padding: 8px;
    background: var(--panel-3);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: border-color var(--transition);
}
.color-preview:hover { border-color: var(--accent-2); }
.color-preview-box {
    width: 34px; height: 34px;
    border: 2px solid var(--border-strong);
    border-radius: var(--radius-sm);
    transition: transform var(--transition);
}
.color-preview:hover .color-preview-box { transform: scale(1.08); }
.color-preview-text { font-weight: 700; color: var(--text); font-size: .85em; }
input[type="color"] { display: none; }

label {
    display: block;
    margin-top: 12px;
    margin-bottom: 2px;
    font-weight: 600;
    color: var(--accent-2);
    font-size: .78em;
    letter-spacing: .3px;
}

.checkbox-row {
    display: flex; align-items: center; gap: 8px;
    margin-top: 10px; font-size: .82em; color: var(--text);
    cursor: pointer; user-select: none;
}
.checkbox-row input { accent-color: var(--accent); width: 16px; height: 16px; cursor: pointer; }

.slider-value {
    display: inline-block;
    min-width: 46px;
    text-align: right;
    color: var(--accent);
    font-weight: 700;
    font-size: .85em;
}

.info-box {
    background: var(--accent-soft);
    border-left: 3px solid var(--accent-2);
    padding: 9px 11px;
    margin-top: 10px;
    border-radius: var(--radius-sm);
    font-size: .76em;
    color: var(--text);
    line-height: 1.45;
}

/* ===== Canvas =========================================================== */
.canvas-wrap { display: flex; flex-direction: column; gap: 12px; min-width: 0; }

.canvas-toolbar {
    display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 8px 10px;
}
.canvas-toolbar .spacer { flex: 1; }
.mini-btn {
    padding: 7px 11px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--panel-3);
    color: var(--text);
    font-family: inherit;
    font-size: .82em;
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition);
    display: inline-flex; align-items: center; gap: 6px;
}
.mini-btn:hover:not(:disabled) { background: var(--accent-soft); border-color: var(--accent); }
.mini-btn:disabled { opacity: .35; cursor: not-allowed; }
.zoom-label { font-size: .8em; color: var(--text-dim); min-width: 46px; text-align: center; }

.canvas-container {
    position: relative;
    background:
        repeating-conic-gradient(var(--panel-3) 0% 25%, var(--panel-2) 0% 50%) 50% / 22px 22px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    padding: 16px;
    min-height: 420px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: auto;
}

#canvas {
    max-width: 100%;
    max-height: 72vh;
    border: 1px solid var(--border-strong);
    cursor: crosshair;
    border-radius: 4px;
    touch-action: none;
    display: none;
    box-shadow: 0 6px 24px rgba(0, 0, 0, .45);
}

.instructions { text-align: center; color: var(--text-dim); font-size: 1em; padding: 40px 20px; }
.instructions .big { font-size: 1.35em; margin-bottom: 16px; color: var(--text); }
.instructions .ok { margin-top: 18px; color: var(--accent); }

.watermark-preview {
    background: var(--panel-3);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 14px;
    margin-top: 10px;
    font-size: .85em;
    min-height: 70px;
    display: flex; flex-direction: column;
    align-items: center; justify-content: center;
    color: var(--text);
    overflow: hidden;
}

.btn-export { background: var(--accent); color: var(--on-accent); border-color: var(--accent); }
.btn-export:hover:not(:disabled) { background: var(--accent-strong); }
.btn-clear { background: var(--panel-3); color: var(--danger); border-color: var(--danger); }
.btn-clear:hover:not(:disabled) { background: var(--danger); color: #fff; }

/* ===== Metadata ========================================================= */
.metadata-section {
    background: var(--panel-2);
    padding: 18px;
    margin: var(--gap);
    border-radius: var(--radius);
    border: 1px solid var(--border);
}
.metadata-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; border-bottom: 1px solid var(--border); padding-bottom: 10px; flex-wrap: wrap; gap: 8px; }
.metadata-header h3 { color: var(--accent-2); font-size: .95em; text-transform: uppercase; letter-spacing: .5px; }
.metadata-warning {
    background: rgba(255, 77, 94, 0.10);
    border-left: 3px solid var(--danger);
    padding: 11px 13px; margin-bottom: 14px; border-radius: var(--radius-sm);
    font-size: .82em; color: var(--text); line-height: 1.5;
}
.metadata-warning strong { color: var(--danger); }
.metadata-content {
    background: var(--panel-3);
    padding: 14px; border-radius: var(--radius-sm);
    font-size: .82em; max-height: 300px; overflow-y: auto; line-height: 1.6;
}
.metadata-item {
    margin: 4px 0; padding: 7px 8px;
    border-bottom: 1px solid var(--border);
    display: grid; grid-template-columns: minmax(120px, 200px) 1fr; gap: 10px; align-items: start;
}
.metadata-item:hover { background: var(--accent-soft); }
.metadata-key { color: var(--accent-2); font-weight: 700; word-break: break-word; }
.metadata-value { color: var(--text); word-break: break-word; }
.metadata-value.flag { color: var(--danger); font-weight: 700; }
.no-metadata { color: var(--text-dim); font-style: italic; }

/* ===== Toast ============================================================ */
.toast-wrap {
    position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%);
    display: flex; flex-direction: column; gap: 8px; z-index: 9999; align-items: center;
    pointer-events: none;
}
.toast {
    background: var(--panel);
    border: 1px solid var(--accent);
    color: var(--text);
    padding: 11px 18px; border-radius: 999px;
    font-size: .85em; box-shadow: var(--shadow);
    animation: toast-in .25s ease, toast-out .3s ease 2.4s forwards;
    max-width: 90vw;
}
.toast.danger { border-color: var(--danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes toast-out { to { opacity: 0; transform: translateY(12px); } }

/* ===== Scrollbars ======================================================= */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--panel-3); }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

.kbd {
    font-size: .72em; padding: 1px 6px; border-radius: 4px;
    border: 1px solid var(--border); background: var(--panel-3); color: var(--text-dim);
}
.shortcuts { font-size: .74em; color: var(--text-dim); line-height: 2; margin-top: 6px; }

/* ===== Responsive ======================================================= */
@media (max-width: 980px) {
    .main-content { grid-template-columns: 1fr; }
    .sidebar { position: static; max-height: none; }
    #canvas { max-height: 60vh; }
}
@media (max-width: 560px) {
    .header { flex-direction: column; align-items: flex-start; }
    .metadata-item { grid-template-columns: 1fr; gap: 2px; }
}
@media (prefers-reduced-motion: reduce) {
    * { transition: none !important; animation: none !important; }
}