/* ── Google Font ── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ── Light theme (default) ── */
:root {
    --bg:           #f5f5f5;
    --panel:        #ffffff;
    --panel-alt:    #f7f7f7;
    --border:       #e0e0e0;
    --text:         #111111;
    --text-muted:   #666666;
    --accent:       #111111;
    --accent-text:  #ffffff;
    --code-bg:      #f0f0f0;
    --code-border:  #d8d8d8;
    --upload-bg:    #fafafa;
    --upload-border:#c8c8c8;
    --shadow:       rgba(0,0,0,0.08);
    --shadow-lg:    rgba(0,0,0,0.14);
}

/* ── Dark theme ── */
[data-theme="dark"] {
    --bg:           #0a0a0a;
    --panel:        #141414;
    --panel-alt:    #1c1c1c;
    --border:       #2a2a2a;
    --text:         #f0f0f0;
    --text-muted:   #888888;
    --accent:       #f0f0f0;
    --accent-text:  #111111;
    --code-bg:      #1c1c1c;
    --code-border:  #333333;
    --upload-bg:    #181818;
    --upload-border:#333333;
    --shadow:       rgba(0,0,0,0.4);
    --shadow-lg:    rgba(0,0,0,0.6);
}

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

body {
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    padding: 32px 16px;
    transition: background-color 200ms ease, color 200ms ease;
}

/* ── Container ── */
.container {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: 0 4px 24px var(--shadow);
    max-width: 1200px;
    width: 100%;
    padding: 36px 40px;
    transition: background-color 200ms ease, border-color 200ms ease;
}

/* ── Header ── */
.header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 32px;
}

.logo {
    width: 48px;
    height: 48px;
    object-fit: contain;
    border-radius: 10px;
    flex-shrink: 0;
}

.title-wrap {
    flex: 1;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
    margin-bottom: 4px;
}

.header h1 i {
    font-size: 1.25rem;
    margin-right: 6px;
    opacity: 0.8;
}

.header p {
    color: var(--text-muted);
    font-size: 0.875rem;
    line-height: 1.4;
}

/* ── Theme toggle ── */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.theme-toggle-label {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
}

.switch {
    position: relative;
    display: inline-block;
    width: 46px;
    height: 24px;
}

.switch input { display: none; }

.slider {
    position: absolute;
    cursor: pointer;
    inset: 0;
    background-color: var(--border);
    border-radius: 999px;
    transition: background-color 200ms ease;
    border: 1.5px solid var(--border);
}

.slider::before {
    content: "";
    position: absolute;
    width: 18px;
    height: 18px;
    left: 2px;
    top: 1px;
    background: var(--text-muted);
    border-radius: 50%;
    transition: transform 200ms ease, background-color 200ms ease;
}

input:checked + .slider {
    background-color: var(--accent);
    border-color: var(--accent);
}

input:checked + .slider::before {
    background: var(--accent-text);
    transform: translateX(22px);
}

/* ── Divider ── */
.divider {
    height: 1px;
    background: var(--border);
    margin: 0 0 28px;
}

/* ── Main content layout ── */
.main-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 40px;
    margin-bottom: 28px;
    align-items: start;
}

/* ── Section title ── */
.section-title {
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title i { font-size: 0.85rem; }

/* ── Color picker section ── */
.color-section { display: flex; flex-direction: column; }

.color-controls {
    display: flex;
    gap: 14px;
    margin-bottom: 20px;
    height: 380px;
}

.color-picker {
    flex: 1;
    border-radius: 10px;
    overflow: hidden;
    border: 1px solid var(--border);
    position: relative;
}

.color-box {
    width: 100%;
    height: 100%;
    position: relative;
    cursor: crosshair;
    border-radius: 10px;
    overflow: hidden;
}

canvas#colorCanvas {
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    inset: 0;
}

.selector {
    width: 14px;
    height: 14px;
    border: 2px solid #ffffff;
    border-radius: 50%;
    box-shadow: 0 0 0 1.5px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.3);
    position: absolute;
    pointer-events: none;
    transform: translate(-50%, -50%);
    z-index: 10;
}

/* ── Hue slider ── */
.hue-slider-container {
    width: 18px;
    display: flex;
    flex-direction: column;
}

.hue-slider {
    width: 100%;
    height: 100%;
    background: linear-gradient(to top,
        #ff0000, #ff8000, #ffff00, #00ff00,
        #00ffff, #0000ff, #ff00ff, #ff0000);
    position: relative;
    border-radius: 999px;
    overflow: visible;
    cursor: pointer;
    border: 1px solid var(--border);
}

.hue-selector {
    width: 28px;
    height: 14px;
    background: var(--panel);
    border: 2px solid var(--text);
    border-radius: 4px;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

/* ── Color result ── */
.color-result {
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 20px;
}

.color-display {
    display: flex;
    align-items: center;
    gap: 20px;
}

.color-preview {
    width: 72px;
    height: 72px;
    border-radius: 10px;
    border: 1px solid var(--border);
    flex-shrink: 0;
    box-shadow: 0 2px 8px var(--shadow);
    transition: background-color 80ms;
}

.color-info { flex: 1; }

.color-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.color-row:last-child { margin-bottom: 0; }

.color-label {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-muted);
    width: 30px;
    flex-shrink: 0;
}

.color-code {
    font-family: 'SF Mono', 'Fira Code', 'Courier New', monospace;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text);
    background: var(--code-bg);
    border: 1px solid var(--code-border);
    padding: 5px 10px;
    border-radius: 6px;
    letter-spacing: 0.03em;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.copy-btn {
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--panel-alt);
    border: 1px solid var(--border);
    border-radius: 6px;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 0.75rem;
    transition: background-color 150ms, color 150ms, border-color 150ms;
}

.copy-btn:hover {
    background: var(--border);
    color: var(--text);
}

.copy-btn.copied {
    background: var(--accent);
    border-color: var(--accent);
    color: var(--accent-text);
}

/* ── Image section ── */
.image-section { display: flex; flex-direction: column; }

.upload-container {
    position: relative;
    margin-bottom: 16px;
}

.upload-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 28px 20px;
    background: var(--upload-bg);
    border: 1.5px dashed var(--upload-border);
    border-radius: 10px;
    cursor: pointer;
    transition: border-color 200ms, background-color 200ms;
    gap: 10px;
}

.upload-label:hover {
    border-color: var(--text-muted);
    background: var(--panel-alt);
}

.upload-label i {
    font-size: 2rem;
    color: var(--text-muted);
}

.upload-label span {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

#imageUpload {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
}

/* Image canvas — NOT stretched */
.image-canvas-wrapper {
    width: 100%;
    border-radius: 10px;
    border: 1px solid var(--border);
    background: var(--panel-alt);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 0;
    margin-bottom: 12px;
    position: relative;
}

canvas#imageCanvas {
    display: block;
    max-width: 100%;
    max-height: 380px;
    width: auto;
    height: auto;
    cursor: crosshair;
    border-radius: 9px;
}

/* Crosshair — removed */


/* ── Button ── */
.btn {
    background: var(--accent);
    color: var(--accent-text);
    border: none;
    padding: 11px 20px;
    font-family: 'Inter', sans-serif;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: opacity 200ms, transform 150ms, box-shadow 150ms;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
}

.btn:hover {
    opacity: 0.85;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--shadow-lg);
}

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

/* ── Footer ── */
.footer {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* ── Responsive ── */
@media (max-width: 900px) {
    .main-content {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .color-controls {
        height: 300px;
    }

    canvas#imageCanvas {
        max-height: 300px;
    }

    .container {
        padding: 24px 20px;
    }

    .header h1 {
        font-size: 1.2rem;
    }
}