/* =============================================
   オンライン一括画像透かしツール - Style
   ============================================= */

:root {
    /* Colors - Dark Theme */
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-card: rgba(17, 24, 39, 0.8);
    --bg-card-hover: rgba(30, 41, 59, 0.9);
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    --border-accent: rgba(99, 102, 241, 0.4);

    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --accent-primary: #6366f1;
    --accent-primary-hover: #818cf8;
    --accent-glow: rgba(99, 102, 241, 0.25);
    --accent-gradient: linear-gradient(135deg, #6366f1, #8b5cf6);

    --success: #22c55e;
    --success-glow: rgba(34, 197, 94, 0.2);
    --warning: #f59e0b;
    --danger: #ef4444;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Noto Sans JP', system-ui, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 60% at 20% 10%, rgba(99, 102, 241, 0.08), transparent),
        radial-gradient(ellipse 60% 50% at 80% 90%, rgba(139, 92, 246, 0.06), transparent);
    pointer-events: none;
    z-index: 0;
}

/* ============ Header ============ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 28px;
    height: 28px;
    color: var(--accent-primary);
}

.logo h1 {
    font-size: 1.2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.header-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.35rem 0.75rem;
    background: var(--success-glow);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 999px;
    font-size: 0.78rem;
    color: var(--success);
    font-weight: 500;
}

/* ============ Main Content ============ */
.main-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-2xl);
}

/* ============ Section ============ */
.section {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    backdrop-filter: blur(10px);
    transition: border-color var(--transition-base);
}

.section:hover {
    border-color: var(--border-hover);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: var(--space-md);
    margin-bottom: var(--space-xl);
}

.section-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--accent-gradient);
    color: white;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.section-description {
    color: var(--text-secondary);
    font-size: 0.88rem;
    margin-top: 0.25rem;
    width: 100%;
}

/* ============ Drop Zone ============ */
.drop-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    background: var(--bg-glass);
    position: relative;
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--accent-gradient);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--bg-glass-hover);
}

.drop-zone.drag-over::before {
    opacity: 0.05;
}

.drop-zone-content {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: var(--space-sm);
    transition: color var(--transition-base), transform var(--transition-base);
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
    color: var(--accent-primary);
    transform: translateY(-4px);
}

.drop-text {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.drop-subtext {
    font-size: 0.82rem;
    color: var(--text-muted);
}

.drop-formats {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--space-sm);
}

/* Uploaded Info */
.uploaded-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: var(--success-glow);
    border: 1px solid rgba(34, 197, 94, 0.2);
    border-radius: var(--radius-md);
}

.uploaded-count {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--success);
    font-size: 0.88rem;
    font-weight: 500;
}

/* ============ Settings ============ */
.template-bar {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    flex-wrap: wrap;
    margin-bottom: var(--space-lg);
    padding: var(--space-md);
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.template-bar-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.template-list {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    flex: 1;
}

.template-chip {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0.7rem;
    background: var(--bg-glass-hover);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    font-size: 0.78rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.template-chip:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary-hover);
    background: var(--accent-glow);
}

.template-chip .delete-template {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    font-size: 0.65rem;
    color: var(--text-muted);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
    line-height: 1;
}

.template-chip .delete-template:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.15);
}

.template-actions {
    margin-left: auto;
}

.template-empty {
    font-size: 0.78rem;
    color: var(--text-muted);
    font-style: italic;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-lg);
}

.settings-card {
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: border-color var(--transition-base);
}

.settings-card:hover {
    border-color: var(--border-hover);
}

.settings-card-title {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.settings-card-title svg {
    color: var(--accent-primary);
}

/* ============ Form Elements ============ */
.form-group {
    margin-bottom: var(--space-md);
}

.form-group:last-child {
    margin-bottom: 0;
}

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: var(--space-xs);
}

.form-input,
.form-select {
    width: 100%;
    padding: 0.6rem 0.85rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.88rem;
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input:focus,
.form-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394a3b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.input-with-unit {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.form-range {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    outline: none;
    cursor: pointer;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
    box-shadow: 0 0 8px var(--accent-glow);
    transition: transform var(--transition-fast);
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.form-range::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--accent-gradient);
    border: 2px solid var(--bg-primary);
    cursor: pointer;
}

.range-value {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--accent-primary-hover);
    min-width: 45px;
    text-align: right;
    font-variant-numeric: tabular-nums;
}

/* Color Picker */
.color-picker-wrapper {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.form-color {
    -webkit-appearance: none;
    appearance: none;
    width: 36px;
    height: 36px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    background: none;
    padding: 2px;
}

.form-color::-webkit-color-swatch-wrapper {
    padding: 0;
}

.form-color::-webkit-color-swatch {
    border: none;
    border-radius: 3px;
}

.color-value {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-family: 'Courier New', monospace;
}

/* Checkbox */
.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.form-checkbox {
    display: none;
}

.checkbox-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.form-checkbox:checked + .checkbox-custom {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
}

.form-checkbox:checked + .checkbox-custom::after {
    content: '✓';
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
}

/* ============ Position Grid ============ */
.position-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6px;
    max-width: 200px;
}

.position-btn {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.position-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary-hover);
    background: var(--accent-glow);
}

.position-btn.active {
    background: var(--accent-gradient);
    border-color: var(--accent-primary);
    color: white;
    box-shadow: 0 0 12px var(--accent-glow);
}

/* ============ Preview ============ */
.preview-actions {
    display: flex;
    gap: var(--space-md);
    align-items: center;
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: var(--space-md);
}

.preview-card {
    position: relative;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
    background: var(--bg-secondary);
    transition: all var(--transition-base);
}

.preview-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.preview-card canvas {
    display: block;
    width: 100%;
    height: auto;
}

.preview-card-info {
    padding: 0.6rem 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
}

.preview-card-name {
    font-size: 0.78rem;
    color: var(--text-secondary);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.preview-card-size {
    font-size: 0.72rem;
    color: var(--text-muted);
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 2px 10px var(--accent-glow);
}

.btn-primary:hover {
    box-shadow: 0 4px 20px var(--accent-glow);
    transform: translateY(-1px);
}

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

.btn-lg {
    padding: 0.75rem 1.5rem;
    font-size: 0.95rem;
}

.btn-ghost {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

.btn-ghost:hover {
    border-color: var(--border-hover);
    color: var(--text-primary);
    background: var(--bg-glass-hover);
}

.btn-sm {
    padding: 0.35rem 0.75rem;
    font-size: 0.78rem;
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--border-accent);
    color: var(--accent-primary-hover);
}

.btn-outline:hover {
    background: var(--accent-glow);
    border-color: var(--accent-primary);
}

/* ============ Progress Overlay ============ */
.progress-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.progress-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    text-align: center;
    min-width: 320px;
    backdrop-filter: blur(20px);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-lg);
}

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

.progress-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: var(--space-md);
}

.progress-bar-track {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: var(--space-sm);
}

.progress-bar-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 3px;
    width: 0%;
    transition: width var(--transition-base);
}

.progress-percent {
    color: var(--accent-primary-hover);
    font-size: 0.85rem;
    font-weight: 600;
}

/* ============ Modal ============ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(6px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    min-width: 380px;
    max-width: 90vw;
    backdrop-filter: blur(20px);
}

.modal-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
    margin-top: var(--space-lg);
}

/* ============ Footer ============ */
.footer {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--space-xl) var(--space-lg);
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border-color);
    margin-top: var(--space-xl);
}

/* ============ Responsive ============ */
@media (max-width: 768px) {
    .main-content {
        padding: var(--space-md);
        gap: var(--space-xl);
    }

    .section {
        padding: var(--space-lg);
    }

    .settings-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

    .template-bar {
        flex-direction: column;
        align-items: stretch;
    }

    .template-actions {
        margin-left: 0;
    }

    .header-inner {
        padding: 0.5rem 1rem;
    }

    .section-header {
        flex-direction: column;
    }

    .preview-actions {
        width: 100%;
    }

    .btn-lg {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1rem;
    }

    .header-badge span {
        display: none;
    }

    .section-header h2 {
        font-size: 1.1rem;
    }

    .modal-card {
        min-width: auto;
        margin: 1rem;
    }
}

/* ============ Animations ============ */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.preview-card {
    animation: fadeIn 0.3s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-card {
    animation: slideUp 0.3s ease-out;
}