:root {
    --bg-color: #0f172a; /* Slate 900 */
    --card-bg: #1e293b; /* Slate 800 */
    --card-border: #334155; /* Slate 700 */
    --text-primary: #f1f5f9; /* Slate 100 */
    --text-secondary: #94a3b8; /* Slate 400 */
    --accent-color: #3b82f6; /* Blue 500 */
    --accent-hover: #2563eb; /* Blue 600 */
    --primary-color: #3b82f6; /* Match accent color */
    --border-radius: 12px;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    background-image: radial-gradient(circle at 50% 0%, #1e293b 0%, #0f172a 100%);
    min-height: 100vh;
}

.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 30px;
    padding: 20px 30px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.header h1 {
    margin: 0;
    font-size: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
    background: linear-gradient(to right, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-top: 4px;
}

/* Main Layout */
.main-layout {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 24px;
    margin-bottom: 30px;
}

/* Input Section */
.input-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    gap: 20px;
    height: fit-content;
}

.preset-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 10px;
}

.preset-tag {
    cursor: pointer;
    transition: all 0.2s;
    background-color: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: #93c5fd;
}

.preset-tag:hover {
    transform: translateY(-2px);
    background-color: rgba(59, 130, 246, 0.2);
    color: white;
}

/* Overriding Element Plus Input styles for dark mode */
.el-textarea__inner {
    background-color: #0f172a !important;
    border-color: var(--card-border) !important;
    color: var(--text-primary) !important;
    box-shadow: none !important;
}

.el-textarea__inner:focus {
    border-color: var(--accent-color) !important;
}

.generate-btn {
    width: 100%;
    height: 48px;
    font-size: 16px;
    margin-top: 10px;
    background: linear-gradient(135deg, var(--accent-color), var(--accent-hover));
    border: none;
    font-weight: 600;
}

.generate-btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

/* Preview Section */
.preview-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 600px;
    position: relative;
}

.preview-image {
    max-width: 100%;
    max-height: 600px;
    border-radius: 8px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.3);
    transition: transform 0.3s;
}

.empty-state {
    text-align: center;
    color: var(--text-secondary);
}

.empty-icon {
    font-size: 64px;
    margin-bottom: 20px;
    display: block;
    opacity: 0.3;
}

/* History Section */
.history-section {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 24px;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.section-title {
    margin-top: 0;
    margin-bottom: 24px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    border-left: 4px solid var(--accent-color);
    padding-left: 12px;
}

.history-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
}

.history-item {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 1;
    border: 1px solid var(--card-border);
    transition: transform 0.2s, box-shadow 0.2s;
}

.history-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s;
}

.history-item:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

.history-item:hover .history-img {
    transform: scale(1.1);
}

.history-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.7));
    color: var(--text-primary);
    padding: 12px;
    transform: translateY(100%);
    transition: transform 0.3s;
    font-size: 12px;
    backdrop-filter: blur(4px);
}

.history-item:hover .history-overlay {
    transform: translateY(0);
}

.history-prompt {
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
    margin-bottom: 6px;
    color: #e2e8f0;
}

.history-time {
    color: #94a3b8;
    font-size: 10px;
}

/* Loading Animation */
.generating-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
    border-radius: var(--border-radius);
    color: var(--text-primary);
}

.loader {
    width: 48px;
    height: 48px;
    border: 4px solid rgba(59, 130, 246, 0.3);
    border-bottom-color: var(--accent-color);
    border-radius: 50%;
    display: inline-block;
    box-sizing: border-box;
    animation: rotation 1s linear infinite;
    margin-bottom: 20px;
}

@keyframes rotation {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Overriding Element Plus generic styles */
.el-button--plain {
    background-color: transparent !important;
    border-color: var(--card-border) !important;
    color: var(--text-secondary) !important;
}

.el-button--plain:hover {
    border-color: var(--accent-color) !important;
    color: var(--accent-color) !important;
    background-color: rgba(59, 130, 246, 0.1) !important;
}

.el-tag--plain {
    background-color: rgba(30, 41, 59, 0.5) !important;
    border-color: var(--card-border) !important;
    color: var(--text-secondary) !important;
}