/* ========================================
   RESET & BASE STYLES
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette - Premium Dark Theme */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --danger-gradient: linear-gradient(135deg, #fa709a 0%, #fee140 100%);

    --bg-primary: #0f0f1e;
    --bg-secondary: #1a1a2e;
    --bg-tertiary: #252541;
    --bg-card: rgba(37, 37, 65, 0.6);
    --bg-hover: rgba(102, 126, 234, 0.1);

    --text-primary: #ffffff;
    --text-secondary: #b4b4c8;
    --text-muted: #7a7a8c;

    --border-color: rgba(102, 126, 234, 0.2);
    --border-hover: rgba(102, 126, 234, 0.4);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.4);

    --glow-primary: 0 0 20px rgba(102, 126, 234, 0.3);
    --glow-success: 0 0 20px rgba(79, 172, 254, 0.3);

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

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Animated Background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(circle at 20% 50%, rgba(102, 126, 234, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(118, 75, 162, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(79, 172, 254, 0.05) 0%, transparent 50%);
    z-index: -1;
    animation: backgroundPulse 15s ease-in-out infinite;
}

@keyframes backgroundPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.8;
    }
}

/* ========================================
   LAYOUT
   ======================================== */
.app-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   HEADER
   ======================================== */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    animation: fadeInDown 0.6s ease;
}

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

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

.header-content {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: #667eea;
    filter: drop-shadow(var(--glow-primary));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }
}

.logo h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 1.1rem;
    font-weight: 300;
}

/* ========================================
   MAIN CONTENT
   ======================================== */
.main-content {
    flex: 1;
}

/* ========================================
   UPLOAD SECTION
   ======================================== */
.upload-section {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease 0.2s both;
}

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

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

.upload-area {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-normal);
    cursor: pointer;
    position: relative;
    overflow: hidden;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.upload-area:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-lg), var(--glow-primary);
    transform: translateY(-2px);
}

.upload-area:hover::before {
    opacity: 0.05;
}

.upload-area.drag-over {
    border-color: #667eea;
    background: rgba(102, 126, 234, 0.1);
    box-shadow: var(--shadow-xl), var(--glow-primary);
}

.upload-area>* {
    position: relative;
    z-index: 1;
}

.upload-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    color: #667eea;
    filter: drop-shadow(var(--glow-primary));
    animation: float 3s ease-in-out infinite;
}

.upload-icon svg {
    width: 100%;
    height: 100%;
}

.upload-title {
    font-size: 1.8rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.upload-subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: var(--spacing-md);
}

.upload-formats {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   BUTTONS
   ======================================== */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.875rem 1.75rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    font-family: inherit;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: var(--shadow-md), var(--glow-primary);
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--glow-primary);
}

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

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

.btn-secondary:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.btn-primary svg,
.btn-secondary svg {
    width: 20px;
    height: 20px;
}

/* ========================================
   SETTINGS PANEL
   ======================================== */
.settings-panel {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
}

.settings-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.settings-title svg {
    width: 24px;
    height: 24px;
    color: #667eea;
}

.setting-group {
    margin-bottom: var(--spacing-md);
}

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

.setting-group label {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.setting-group input[type="number"] {
    width: 100%;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: all var(--transition-fast);
}

.setting-group input[type="number"]:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

.quality-slider input[type="range"] {
    flex: 1;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.quality-slider input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-md), var(--glow-primary);
    transition: all var(--transition-fast);
}

.quality-slider input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

.quality-slider input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md), var(--glow-primary);
    transition: all var(--transition-fast);
}

.quality-slider input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.2);
}

#qualityValue {
    min-width: 45px;
    text-align: right;
    color: #667eea;
    font-weight: 600;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-primary);
}

.checkbox-group input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #667eea;
}

.watermark-settings {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
}

.settings-subtitle {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: #4facfe;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

/* ========================================
   PREVIEW SECTION
   ======================================== */
.preview-section {
    animation: fadeInUp 0.6s ease 0.4s both;
}

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

.section-header h2 {
    font-size: 1.8rem;
    font-weight: 600;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.action-buttons {
    display: flex;
    gap: var(--spacing-sm);
}

.preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.preview-card {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    animation: scaleIn 0.3s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.preview-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg), var(--glow-primary);
    border-color: var(--border-hover);
}

.preview-image-container {
    position: relative;
    width: 100%;
    height: 200px;
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: var(--spacing-md);
    background: var(--bg-tertiary);
    cursor: grab;
    user-select: none;
}

.preview-image-container:active {
    cursor: grabbing;
}

.preview-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    pointer-events: none;
    /* Let the container handle mouse events */
}

.preview-info {
    margin-bottom: var(--spacing-md);
}

.preview-filename-edit {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: var(--spacing-xs);
}

.filename-input {
    flex: 1;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-weight: 600;
    font-size: 0.95rem;
    padding: 0.5rem;
    font-family: inherit;
    transition: all var(--transition-fast);
    min-width: 0;
}

.filename-input:hover {
    border-color: var(--border-hover);
    background: rgba(102, 126, 234, 0.05);
}

.filename-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
    background: var(--bg-secondary);
}

.filename-extension {
    color: #667eea;
    font-weight: 600;
    font-size: 0.9rem;
    flex-shrink: 0;
}

.preview-details {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: var(--spacing-sm);
}

.control-group {
    background: rgba(0, 0, 0, 0.2);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    /* Reducido para que quepan dos */
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.control-group label {
    font-size: 0.7rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

.zoom-slider,
.size-slider {
    flex: 1;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.zoom-slider::-webkit-slider-thumb,
.size-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 14px;
    height: 14px;
    background: var(--primary-gradient);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.zoom-value,
.size-value {
    font-size: 0.85rem;
    color: #4facfe;
    font-weight: 600;
    min-width: 45px;
    text-align: right;
}

.preview-size {
    color: #4facfe;
    font-weight: 500;
}

.preview-actions {
    display: flex;
    gap: var(--spacing-xs);
}

.btn-download,
.btn-delete {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.625rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn-download {
    background: var(--success-gradient);
    color: white;
    box-shadow: var(--shadow-sm), var(--glow-success);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), var(--glow-success);
}

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

.btn-delete:hover {
    background: rgba(250, 112, 154, 0.2);
    color: #fa709a;
    border-color: #fa709a;
}

.btn-download svg,
.btn-delete svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   TOAST NOTIFICATIONS
   ======================================== */
.toast-container {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-xl);
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    animation: slideInRight 0.3s ease;
}

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

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

.toast.success {
    border-left: 4px solid #4facfe;
}

.toast.error {
    border-left: 4px solid #fa709a;
}

.toast.info {
    border-left: 4px solid #667eea;
}

.toast-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.toast.success .toast-icon {
    color: #4facfe;
}

.toast.error .toast-icon {
    color: #fa709a;
}

.toast.info .toast-icon {
    color: #667eea;
}

.toast-message {
    flex: 1;
    color: var(--text-primary);
    font-size: 0.95rem;
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    text-align: center;
    padding: var(--spacing-lg) 0;
    margin-top: var(--spacing-xl);
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 1024px) {
    .upload-section {
        grid-template-columns: 1fr;
    }

    .preview-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .app-container {
        padding: var(--spacing-md);
    }

    .logo h1 {
        font-size: 2rem;
    }

    .tagline {
        font-size: 1rem;
    }

    .upload-area {
        padding: var(--spacing-lg);
    }

    .upload-title {
        font-size: 1.5rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .action-buttons {
        width: 100%;
        flex-direction: column;
    }

    .action-buttons button {
        width: 100%;
    }

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

    .toast-container {
        left: var(--spacing-md);
        right: var(--spacing-md);
    }

    .toast {
        min-width: auto;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 1.5rem;
    }

    .upload-icon {
        width: 60px;
        height: 60px;
    }

    .upload-title {
        font-size: 1.3rem;
    }

    .btn-primary,
    .btn-secondary {
        padding: 0.75rem 1.25rem;
        font-size: 0.9rem;
    }
}

/* ========================================
   WEIGHT WARNING
   ======================================== */
.weight-warning {
    display: none;
    align-items: center;
    gap: 8px;
    background: rgba(250, 112, 154, 0.15);
    border: 1px solid #fa709a;
    border-radius: var(--radius-sm);
    padding: 8px 12px;
    margin-bottom: var(--spacing-sm);
    color: #fa709a;
    font-size: 0.85rem;
    font-weight: 600;
    animation: alertFadeIn 0.3s ease;
}

.weight-warning.show {
    display: flex;
}

.weight-warning svg {
    flex-shrink: 0;
    animation: pulse-danger 2s infinite;
}

@keyframes pulse-danger {
    0% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }

    100% {
        transform: scale(1);
        opacity: 1;
    }
}

@keyframes alertFadeIn {
    from {
        opacity: 0;
        transform: translateY(-5px);
    }

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