/* CSS Variables */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --bg-card: #16161f;

    --text-primary: #f4f4f6;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;

    --accent-primary: #7c5cff;
    --accent-secondary: #5c9cff;
    --accent-gradient: linear-gradient(135deg, #7c5cff 0%, #5c9cff 100%);

    --gemini-color: #4285f4;
    --nano-color: #ff6b35;

    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --font-primary: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Pattern */
.background-pattern {
    position: fixed;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 50% at 50% -20%, rgba(124, 92, 255, 0.15), transparent),
        radial-gradient(ellipse 60% 40% at 80% 100%, rgba(92, 156, 255, 0.1), transparent);
    pointer-events: none;
    z-index: 0;
}

/* Container */
.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInDown 0.6s ease-out;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--accent-primary);
}

.logo-text {
    font-size: 2rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 400;
}

/* Workspace */
.workspace {
    flex: 1;
    display: grid;
    gap: 2rem;
    animation: fadeInUp 0.6s ease-out 0.2s both;
}

@media (min-width: 900px) {
    .workspace {
        grid-template-columns: 1fr 1fr;
        grid-template-rows: auto auto;
    }

    .upload-section {
        grid-row: 1 / 2;
    }

    .action-section {
        grid-column: 1 / -1;
        grid-row: 2 / 3;
    }

    .result-section {
        grid-row: 1 / 2;
    }
}

/* Mode Switcher */
.mode-switcher {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2rem;
    padding: 0.35rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
    max-width: 100%;
    overflow-x: auto;
}

.mode-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.6rem 1rem;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    white-space: nowrap;
}

.mode-btn:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

.mode-btn.active {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 12px rgba(124, 92, 255, 0.2);
}

.mode-btn svg {
    width: 18px;
    height: 18px;
}

/* Desktop Tab Adjustments */
@media (min-width: 768px) {
    .mode-switcher {
        padding: 0.5rem;
        gap: 0.75rem;
    }

    .mode-btn {
        padding: 0.75rem 1.25rem;
        font-size: 0.95rem;
    }
}

@media (min-width: 1024px) {
    .mode-btn {
        padding: 0.75rem 1.5rem;
    }
}

/* Upload Section */
.upload-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.view-container {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.view-container.active {
    display: block;
}

.upload-grid.single-col {
    display: flex;
    justify-content: center;
}

.upload-grid.single-col .upload-card {
    width: 100%;
    max-width: 400px;
}

.upload-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

.upload-card {
    background: var(--bg-card);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.upload-card:hover {
    border-color: var(--accent-primary);
    transform: translateY(-2px);
    background: var(--bg-tertiary);
}

.upload-card.has-file {
    border-style: solid;
    padding: 0;
}

.upload-card .card-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    pointer-events: none;
}

.upload-card.has-file .card-content {
    display: none;
}

.upload-card .card-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: none;
}

.upload-card.has-file .card-preview {
    display: block;
}

.upload-card h3 {
    font-size: 1rem;
    font-weight: 600;
}

.upload-card p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.upload-icon {
    width: 40px;
    height: 40px;
    color: var(--accent-primary);
    margin-bottom: 0.25rem;
}

.required-badge {
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.25rem 0.5rem;
    background: rgba(124, 92, 255, 0.1);
    color: var(--accent-primary);
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

.upload-card.optional .upload-icon {
    color: var(--text-muted);
}

.btn-clear-mini {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    color: white;
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    line-height: 1;
    z-index: 10;
    transition: background var(--transition-fast);
}

.btn-clear-mini:hover {
    background: rgba(255, 71, 87, 0.9);
}

.upload-card.has-file .btn-clear-mini {
    display: flex;
}

/* Preview */
.preview-container {
    display: none;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.preview-container.visible {
    display: block;
    animation: fadeIn 0.3s ease-out;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.preview-header span {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.btn-clear {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.4rem 0.75rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-clear:hover {
    background: rgba(255, 100, 100, 0.1);
    border-color: rgba(255, 100, 100, 0.3);
    color: #ff6b6b;
}

.btn-clear svg {
    width: 16px;
    height: 16px;
}

.preview-image-wrapper {
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
    background: var(--bg-secondary);
}

.preview-image-wrapper img {
    max-width: 100%;
    max-height: 300px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* Action Section */
.action-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
    padding: 2rem;
}

.btn-transform {
    position: relative;
    padding: 1rem 3rem;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: var(--font-primary);
    color: white;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-xl);
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: 0 4px 20px rgba(124, 92, 255, 0.3);
    overflow: hidden;
}

.btn-transform:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(124, 92, 255, 0.4);
}

.btn-transform:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-transform.loading {
    pointer-events: none;
}

.btn-transform .btn-text,
.btn-transform .btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-transform .btn-loading {
    display: none;
}

.btn-transform.loading .btn-text {
    display: none;
}

.btn-transform.loading .btn-loading {
    display: flex;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

/* Pipeline Info */
.pipeline-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.pipeline-step {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.step-icon {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
}

.step-icon.gemini {
    background: var(--gemini-color);
    color: white;
}

.step-icon.nano {
    background: var(--nano-color);
    color: white;
}

.pipeline-step span {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.pipeline-arrow {
    color: var(--text-muted);
    font-size: 1.25rem;
}

/* Result Section */
.result-section {
    display: none;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.result-section.visible {
    display: block;
    animation: fadeIn 0.4s ease-out;
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.25rem;
    background: var(--bg-tertiary);
    border-bottom: 1px solid var(--border-color);
}

.result-header h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.result-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.5rem 1rem;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-sm);
    color: white;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-download:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(124, 92, 255, 0.3);
}

.btn-download svg {
    width: 18px;
    height: 18px;
}

.result-image-wrapper {
    padding: 1.5rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 250px;
    background: var(--bg-secondary);
}

.result-image-wrapper img {
    max-width: 100%;
    max-height: 400px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

/* Analysis Panel */
.analysis-panel {
    padding: 1.25rem;
    border-top: 1px solid var(--border-color);
    display: none;
}

.analysis-panel.visible {
    display: block;
}

.analysis-panel h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

.analysis-item {
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
}

.analysis-item .label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.25rem;
}

.analysis-item .value {
    font-size: 0.9rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    opacity: 0;
    transition: all var(--transition-normal);
    z-index: 1000;
}

.toast.visible {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.error {
    background: linear-gradient(135deg, #ff4757, #ff6b81);
    color: white;
    box-shadow: 0 8px 24px rgba(255, 71, 87, 0.3);
}

.toast svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

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

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

    .header {
        margin-bottom: 2rem;
    }

    .logo-icon {
        width: 40px;
        height: 40px;
    }

    .logo-text {
        font-size: 1.5rem;
    }

    .upload-area {
        padding: 2rem 1.5rem;
    }

    .pipeline-info {
        flex-direction: column;
        gap: 0.75rem;
    }

    .pipeline-arrow {
        transform: rotate(90deg);
    }
}