/**
 * Gemini Watermark Remover - Minimal & Beautiful Styles
 * Clean, modern design with focus on simplicity and elegance
 */

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

:root {
    --color-bg: #0a0a0a;
    --color-surface: #141414;
    --color-surface-hover: #1a1a1a;
    --color-primary: #10b981;
    --color-primary-hover: #059669;
    --color-text: #f5f5f5;
    --color-text-muted: #a3a3a3;
    --color-text-dim: #737373;
    --color-border: #262626;
    --color-error: #ef4444;
    
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    
    --radius: 8px;
    --radius-lg: 12px;
    
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 4px 12px rgba(0, 0, 0, 0.6);
    
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-lg) var(--spacing-md);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 900px;
    padding: 0;
}

/* ===== Header ===== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.title {
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.02em;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 400;
    letter-spacing: 0.01em;
}

/* ===== Drop Zone ===== */
.drop-zone {
    border: 1.5px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    background: var(--color-surface);
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    margin-bottom: var(--spacing-lg);
    position: relative;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.drop-zone:hover,
.drop-zone.dragover {
    border-color: var(--color-primary);
    background: var(--color-surface-hover);
    box-shadow: var(--shadow-lg);
}

.drop-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
}

.drop-icon {
    width: 48px;
    height: 48px;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.drop-zone:hover .drop-icon {
    color: var(--color-primary);
}

.drop-text {
    font-size: 1rem;
    color: var(--color-text);
    margin: 0;
    font-weight: 400;
}

.drop-link {
    background: none;
    border: none;
    color: var(--color-primary);
    cursor: pointer;
    font-size: inherit;
    font-family: inherit;
    font-weight: 500;
    text-decoration: underline;
    text-underline-offset: 2px;
    padding: 0;
    transition: color var(--transition);
}

.drop-link:hover {
    color: var(--color-primary-hover);
}

.drop-hint {
    font-size: 0.75rem;
    color: var(--color-text-dim);
    margin: 0;
}

#fileInput {
    display: none;
}

/* ===== Progress Bar ===== */
.progress-container {
    display: none;
    width: 100%;
    background: var(--color-surface);
    border-radius: var(--radius);
    overflow: hidden;
    margin: var(--spacing-md) 0;
    height: 8px;
    position: relative;
    box-shadow: var(--shadow);
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-primary-hover));
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 0.75rem;
    color: var(--color-text);
    font-weight: 500;
    z-index: 1;
    pointer-events: none;
}

/* ===== Log Area ===== */
.log-area {
    display: none !important;
    font-family: 'SF Mono', 'Monaco', 'Consolas', monospace;
    font-size: 0.7rem;
    color: var(--color-text-dim);
    background: var(--color-surface);
    padding: var(--spacing-sm);
    border-radius: var(--radius);
    max-height: 100px;
    overflow-y: auto;
    margin: var(--spacing-sm) 0;
    border: 1px solid var(--color-border);
}

.log-line {
    margin: 2px 0;
    padding: 2px 0;
}

.log-error {
    color: var(--color-error);
}

/* ===== Result Area ===== */
.result-area {
    display: none;
    margin-top: var(--spacing-lg);
    animation: fadeIn 0.4s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== Images Container (Side-by-Side) ===== */
.images-container {
    display: none;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    animation: fadeIn 0.4s ease;
}

.image-panel {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: transform var(--transition), box-shadow var(--transition);
}

.image-panel:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.image-label {
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-surface);
    color: var(--color-text-muted);
    font-size: 0.75rem;
    font-weight: 500;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--color-border);
    margin: 0;
}

.image-panel:first-child .image-label {
    color: var(--color-text);
}

.image-panel:last-child .image-label {
    color: var(--color-primary);
}

.image-wrapper {
    position: relative;
    width: 100%;
    overflow: hidden;
    background: #000;
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.result-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: contain;
    max-height: 500px;
}

/* ===== Comparison Slider ===== */
.comparison-container {
    display: none;
    margin: var(--spacing-lg) 0;
}

.comparison-wrapper {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.comparison-images {
    position: relative;
    width: 100%;
    overflow: hidden;
}

.comparison-after {
    width: 100%;
    display: block;
}

.comparison-before-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    overflow: hidden;
    border-right: 2px solid var(--color-primary);
}

.comparison-before {
    width: auto;
    height: 100%;
    display: block;
}

.comparison-slider {
    width: 100%;
    margin: var(--spacing-sm) 0;
    cursor: pointer;
}

.comparison-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    padding: 0 var(--spacing-xs);
}

/* ===== Buttons ===== */
.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    box-shadow: var(--shadow);
    min-width: 120px;
}

.btn-primary {
    background: var(--color-primary);
    color: #000;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--color-surface-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

/* ===== Error Message ===== */
.error-message {
    position: fixed;
    top: var(--spacing-md);
    right: var(--spacing-md);
    background: var(--color-error);
    color: white;
    padding: var(--spacing-md);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideIn 0.3s ease;
    max-width: 380px;
    font-size: 0.875rem;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.error-message.fade-out {
    animation: slideOut 0.3s ease forwards;
}

@keyframes slideOut {
    to {
        opacity: 0;
        transform: translateX(100%);
    }
}

.error-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.error-icon {
    font-size: 1.5rem;
}

.error-text {
    flex: 1;
}

.error-close {
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background var(--transition);
}

.error-close:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* ===== Content Sections ===== */
.content-section {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--color-border);
}

.section-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-lg);
    text-align: center;
    letter-spacing: -0.01em;
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.feature-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition);
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-primary);
}

.feature-icon {
    width: 48px;
    height: 48px;
    color: var(--color-primary);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border-radius: var(--radius);
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.feature-card p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

/* Steps Container */
.steps-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.step-number {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #000;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

/* Benefits List */
.benefits-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.benefit-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition);
}

.benefit-item:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow);
}

.benefit-item h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.benefit-item p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

/* FAQ Container */
.faq-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
}

.faq-item {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition);
}

.faq-item:hover {
    border-color: var(--color-primary);
}

.faq-question {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text);
    padding: var(--spacing-md);
    margin: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 300;
    transition: transform var(--transition);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 var(--spacing-md) var(--spacing-md);
}

.faq-answer p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin: 0;
}

/* About Content */
.about-content {
    margin-top: var(--spacing-lg);
}

.about-content p {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.about-content p:last-child {
    margin-bottom: 0;
}

/* ===== Footer ===== */
.footer {
    margin-top: var(--spacing-xl);
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.footer-text {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--spacing-xs);
}

.footer-text a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-text a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

.footer-note {
    font-size: 0.7rem;
    color: var(--color-text-dim);
    line-height: 1.6;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .title {
        font-size: 1.5rem;
    }
    
    .drop-zone {
        padding: var(--spacing-lg);
        min-height: 160px;
    }
    
    .drop-icon {
        width: 40px;
        height: 40px;
    }
    
    .images-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .container {
        padding: 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step-item {
        flex-direction: column;
    }
    
    .step-number {
        align-self: flex-start;
    }
    
    .section-title {
        font-size: 1.25rem;
    }
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-surface);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-dim);
}

/* ===== Screen Reader Only ===== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}