@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --accent: #4a9d5f;
    --accent-dark: #3a7d4a;
    --accent-light: #e8f5ec;
    --accent-glow: rgba(74, 157, 95, 0.2);

    --sidebar-bg: #ffffff;
    --sidebar-border: #e8ecf0;
    --sidebar-text: #1e2a35;
    --sidebar-muted: #7a8fa6;

    --input-bg: #f5f7fa;
    --input-border: #dde2e8;
    --input-focus: rgba(74, 157, 95, 0.25);

    --canvas-bg: #f0f4f8;
    --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.06);
    --shadow-lg: 2px 0 20px rgba(0, 0, 0, 0.06);
    --radius: 10px;
    --transition: 0.18s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    height: 100vh;
    overflow: hidden;
    background: var(--canvas-bg);
    color: var(--sidebar-text);
}

/* ── Layout ── */
.container {
    display: flex;
    height: 100vh;
}

/* ── Left sidebar ── */
.left-panel {
    width: 300px;
    min-width: 260px;
    background: var(--sidebar-bg);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
    box-shadow: var(--shadow-lg);
    border-right: 1px solid var(--sidebar-border);
    scrollbar-width: thin;
    scrollbar-color: #dde2e8 transparent;
}

.left-panel::-webkit-scrollbar {
    width: 4px;
}

.left-panel::-webkit-scrollbar-thumb {
    background: #dde2e8;
    border-radius: 10px;
}

/* Header */
.sidebar-header {
    padding: 24px 22px 18px;
    border-bottom: 1px solid var(--sidebar-border);
    background: linear-gradient(135deg, var(--accent-light) 0%, #fff 100%);
}

.sidebar-header .app-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--sidebar-text);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.3px;
}

.sidebar-header .app-title .icon {
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
    box-shadow: 0 3px 10px var(--accent-glow);
}

.sidebar-header .subtitle {
    margin-top: 5px;
    font-size: 11.5px;
    color: var(--sidebar-muted);
    font-weight: 400;
    line-height: 1.4;
}

/* Sidebar sections */
.sidebar-section {
    padding: 18px 22px;
    border-bottom: 1px solid var(--sidebar-border);
}

.section-label {
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1.1px;
    text-transform: uppercase;
    color: var(--sidebar-muted);
    margin-bottom: 12px;
}

/* ── Drop zone ── */
#dropZone {
    border: 2px dashed #c8d0da;
    border-radius: var(--radius);
    padding: 24px 14px;
    text-align: center;
    cursor: pointer;
    background: var(--input-bg);
    transition: all var(--transition);
    color: var(--sidebar-muted);
    font-size: 13px;
    line-height: 1.5;
}

#dropZone::before {
    content: '🖼️';
    display: block;
    font-size: 28px;
    margin-bottom: 8px;
}

#dropZone:hover,
#dropZone.hover {
    border-color: var(--accent);
    background: var(--accent-light);
    color: var(--accent-dark);
}

#dropZone .drop-hint {
    display: block;
    font-size: 11px;
    color: #aab4bf;
    margin-top: 3px;
}

input[type="file"] {
    display: none;
}

/* ── Labels ── */
.field-label {
    display: block;
    font-size: 11.5px;
    font-weight: 600;
    color: var(--sidebar-muted);
    margin-bottom: 5px;
    margin-top: 12px;
}

.field-label:first-child {
    margin-top: 0;
}

/* ── Grid inputs ── */
.row-cols-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.input-group .field-label {
    margin: 0;
}

input[type="number"] {
    width: 100%;
    padding: 9px 11px;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    color: var(--sidebar-text);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 500;
    transition: border-color var(--transition), box-shadow var(--transition);
    -moz-appearance: textfield;
}

input[type="number"]::-webkit-inner-spin-button {
    opacity: 0.5;
}

input[type="number"]:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--input-focus);
    background: #fff;
}

/* ── Select ── */
select {
    width: 100%;
    padding: 9px 11px;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    color: var(--sidebar-text);
    font-family: 'Inter', sans-serif;
    font-size: 13px;
    font-weight: 500;
    transition: border-color var(--transition), box-shadow var(--transition);
    cursor: pointer;
    appearance: none;
    -webkit-appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%237a8fa6' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 32px;
}

select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--input-focus);
    background-color: #fff;
}

/* ── Range slider ── */
.slider-row {
    display: flex;
    align-items: center;
    gap: 10px;
}

input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: #dde2e8;
    border-radius: 2px;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 2px 6px var(--accent-glow);
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition);
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    box-shadow: 0 3px 10px var(--accent-glow);
}

.slider-value {
    min-width: 22px;
    text-align: right;
    font-size: 13px;
    font-weight: 600;
    color: var(--accent);
}

/* ── Checkboxes ── */
.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 9px;
    cursor: pointer;
    font-size: 12.5px;
    color: #5a6a7a;
    line-height: 1.45;
    margin-top: 10px;
    padding: 10px 12px;
    background: var(--input-bg);
    border: 1.5px solid var(--input-border);
    border-radius: 8px;
    transition: background var(--transition), border-color var(--transition);
    user-select: none;
}

.checkbox-label:first-child {
    margin-top: 0;
}

.checkbox-label:hover {
    background: #edf2f7;
    border-color: #c3cdd8;
    color: var(--sidebar-text);
}

.checkbox-label input[type="checkbox"] {
    appearance: none;
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    min-width: 16px;
    border: 1.5px solid var(--input-border);
    border-radius: 4px;
    background: #fff;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    margin-top: 1px;
}

.checkbox-label input[type="checkbox"]:checked {
    background: var(--accent);
    border-color: var(--accent);
}

.checkbox-label input[type="checkbox"]:checked::after {
    content: '';
    position: absolute;
    left: 3px;
    top: 0px;
    width: 7px;
    height: 11px;
    border: 2px solid #fff;
    border-top: none;
    border-left: none;
    transform: rotate(45deg);
}

/* Disclaimer */
#disclaimerBox {
    border-color: #f0d080;
    background: #fffbee;
}

#disclaimerBox:hover {
    border-color: #d4a800;
    background: #fff8d6;
}

.disclaimer-icon {
    font-size: 14px;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ── Generate button ── */
.btn-generate {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 20px;
    border: none;
    border-radius: var(--radius);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    letter-spacing: 0.1px;
    transition: all var(--transition);
}

.btn-generate.enabled {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    box-shadow: 0 4px 14px var(--accent-glow);
}

.btn-generate.enabled:hover {
    transform: translateY(-1px);
    box-shadow: 0 7px 20px var(--accent-glow);
}

.btn-generate.enabled:active {
    transform: translateY(0);
}

.btn-generate.disabled {
    background: #edf2f7;
    color: #aab4bf;
    cursor: not-allowed;
    box-shadow: none;
}

/* ── Progress bar ── */
#progressBarContainer {
    margin-top: 12px;
    background: #dde2e8;
    border-radius: 6px;
    overflow: hidden;
    height: 5px;
}

#progressBar {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--accent), #7ed357);
    border-radius: 6px;
    transition: width 0.1s linear;
}

/* ── Right panel ── */
.right-panel {
    flex: 1;
    background: var(--canvas-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow: auto;
    padding: 32px;
    gap: 20px;
}

.preview-label {
    font-family: 'Inter', sans-serif;
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 1.1px;
    text-transform: uppercase;
    color: #94a3b8;
    align-self: flex-start;
}

#canvas {
    border-radius: 8px;
    max-width: 100%;
    height: auto;
    box-shadow: 0 6px 30px rgba(0, 0, 0, 0.12);
    background: #fff;
}

.canvas-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    max-width: 480px;
    height: 320px;
    border: 2px dashed #c8d4e0;
    border-radius: 14px;
    color: #a0aec0;
    background: #fff;
    box-shadow: var(--shadow-sm);
}

.canvas-placeholder .ph-icon {
    font-size: 44px;
    opacity: 0.4;
}

.canvas-placeholder p {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
}

/* Spinner */
#spinner {
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.75);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
}

.loader {
    width: 44px;
    height: 44px;
    border: 4px solid #dde2e8;
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ── Responsive ── */
@media (max-width: 720px) {
    body {
        overflow: auto;
    }

    .container {
        flex-direction: column;
        height: auto;
    }

    .left-panel {
        width: 100%;
        min-width: unset;
    }

    .right-panel {
        padding: 20px;
    }
}