:root {
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-bg: #1e293b;
    --success-color: #22c55e;
    --error-color: #ef4444;
    --font-family: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(56, 189, 248, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(168, 85, 247, 0.1) 0%, transparent 20%);
}

.app-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

header {
    text-align: center;
    margin-bottom: 1rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #38bdf8, #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Glass Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Tabs */
.tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 0.5rem;
}

.tab-btn {
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.tab-btn.active {
    color: var(--text-primary);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -0.6rem;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--accent-color);
}

.tab-content {
    display: none;
    animation: fadeIn 0.3s ease;
}

.tab-content.active {
    display: block;
}

/* Upload Zone */
.drop-zone {
    border: 2px dashed var(--glass-border);
    border-radius: 12px;
    padding: 3rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-color);
    background-color: rgba(56, 189, 248, 0.05);
}

.upload-icon {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.browse-link {
    color: var(--accent-color);
    text-decoration: underline;
    font-weight: 500;
}

/* URL Input */
.url-input-container {
    display: flex;
    gap: 1rem;
}

input[type="url"] {
    flex: 1;
    background-color: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 1rem;
}

input[type="url"]:focus {
    outline: none;
    border-color: var(--accent-color);
}

.primary-btn {
    background-color: var(--accent-color);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-family);
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

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

.error-message {
    color: var(--error-color);
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

/* Preview Section */
.image-preview-container {
    position: relative;
    width: 100%;
    max-height: 400px;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    border-radius: 8px;
    background-color: rgba(0, 0, 0, 0.2);
}

#image-preview {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.loading-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(15, 23, 42, 0.8);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    z-index: 10;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid rgba(56, 189, 248, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s linear infinite;
}

/* Results Section */
.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.secondary-btn {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.5rem 1rem;
    font-family: var(--font-family);
    font-size: 0.9rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s ease;
}

.secondary-btn:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.palette-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: 1rem;
}

.color-card {
    background-color: var(--card-bg);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    border: 1px solid var(--glass-border);
}

.color-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.2);
}

.color-swatch {
    height: 120px;
    width: 100%;
    position: relative;
}

.copy-overlay {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.color-card:hover .copy-overlay {
    opacity: 1;
}

.copy-overlay span {
    background-color: rgba(0, 0, 0, 0.6);
    padding: 0.25rem 0.75rem;
    border-radius: 4px;
    font-size: 0.8rem;
    font-weight: 500;
}

.color-info {
    padding: 0.75rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.color-hex {
    font-family: monospace;
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Toast */
#toast-container {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    z-index: 100;
}

.toast {
    background-color: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 1rem 1.5rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    animation: slideIn 0.3s ease forwards;
    min-width: 250px;
}

.toast.success {
    border-left: 4px solid var(--success-color);
}

.toast.error {
    border-left: 4px solid var(--error-color);
}

/* Utilities */
.hidden {
    display: none !important;
}

footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: auto;
    padding-top: 2rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(5px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }

    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* Responsive */
@media (max-width: 600px) {
    .app-container {
        padding: 1rem;
    }

    header h1 {
        font-size: 2rem;
    }

    .url-input-container {
        flex-direction: column;
    }

    .palette-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}