/* ===== CSS Variables ===== */
:root {
    --color-bg: #0f1419;
    --color-card: #1a1f29;
    --color-text-primary: #e8eaed;
    --color-text-secondary: #9aa0a6;
    --color-accent: #4a9eff;
    --color-accent-hover: #6cb0ff;
    --color-success: #3dd68d;
    --color-error: #ff6b6b;
    --color-border: #2d333d;
    --color-drop-zone-hover: #242933;
    --color-input-bg: #0f1419;
    
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    
    --border-radius: 8px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

/* ===== Container ===== */
.container {
    width: 100%;
    max-width: 480px;
}

/* ===== Upload Card ===== */
.upload-card {
    background-color: var(--color-card);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-md);
    padding: 32px;
}

.title {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 24px;
    text-align: center;
    color: var(--color-text-primary);
}
/* ===== Tabs (toggle) ===== */
.tabs {
    position: relative;
    display: grid;
    grid-template-columns: 1fr 1fr;
    padding: 4px;
    margin-bottom: 24px;
    background-color: var(--color-input-bg);
    border: 1px solid var(--color-border);
    border-radius: 999px;
}

.tab-slider {
    position: absolute;
    top: 4px;
    bottom: 4px;
    left: 4px;
    width: calc(50% - 4px);
    background-color: var(--color-accent);
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease;
}

.tabs[data-active="resizer"] .tab-slider {
    transform: translateX(100%);
}

.tab {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 9px 12px;
    background: transparent;
    border: none;
    border-radius: 999px;
    color: var(--color-text-secondary);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.25s ease;
}

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

.tab.active,
.tab.active:hover {
    color: #0f1419;
}

.tab-panel[hidden] {
    display: none;
}

/* ===== Drop Zone ===== */
.drop-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--border-radius);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    background-color: var(--color-input-bg);
}

.drop-zone:hover {
    border-color: var(--color-accent);
    background-color: var(--color-drop-zone-hover);
}

.drop-zone.drag-over {
    border-color: var(--color-accent);
    background-color: var(--color-drop-zone-hover);
    border-style: solid;
}

.upload-icon {
    color: var(--color-text-secondary);
    margin-bottom: 16px;
}

.drop-zone-text {
    font-size: 16px;
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: 8px;
}

.drop-zone-hint {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.file-input {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
    width: 100%;
    height: 100%;
    z-index: 10;
}

/* ===== Config Section ===== */
.config-section {
    margin-top: 24px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

.config-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.config-row:last-child {
    margin-bottom: 0;
}

.config-label {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-secondary);
    min-width: 85px;
    text-align: right;
}

.config-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
    background-color: var(--color-input-bg);
    color: var(--color-text-primary);
    min-width: 0;
}

.config-input-group {
    flex: 1;
    display: flex;
    gap: 8px;
    min-width: 0;
}

.config-input-group input.config-input {
    min-width: 0;
}

.config-input-group select.config-input {
    flex: 0 0 84px;
}

select.config-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239aa0a6' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 40px;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

select.config-input:hover {
    border-color: var(--color-accent);
}

select.config-input option {
    background-color: var(--color-card);
    color: var(--color-text-primary);
    padding: 10px 14px;
    font-size: 14px;
}

select.config-input optgroup {
    background-color: var(--color-card);
    color: var(--color-accent);
    font-weight: 600;
    font-size: 12px;
    padding: 8px 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.config-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(74, 158, 255, 0.2);
}
.config-input::placeholder {
    color: #5f6368;
}

/* ===== Resize Actions ===== */
.resize-actions {
    margin-top: 24px;
    display: flex;
    gap: 12px;
}

.action-button {
    flex: 1;
    padding: 10px 16px;
    background-color: transparent;
    border: 1px solid var(--color-accent);
    border-radius: 6px;
    color: var(--color-accent);
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.action-button.primary {
    background-color: var(--color-accent);
    color: #0f1419;
}

.action-button:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: #0f1419;
}

.action-button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.action-button[hidden] {
    display: none;
}

/* ===== Files Toolbar ===== */
.files-toolbar {
    margin-top: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.files-toolbar[hidden] {
    display: none;
}

.files-toolbar-text {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.files-toolbar + .files-list {
    margin-top: 12px;
}

/* ===== Files List ===== */
.files-list {
    margin-top: 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.files-list:empty {
    display: none;
}
/* ===== File Item ===== */
.file-item {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: 16px;
    background-color: var(--color-input-bg);
    transition: var(--transition);
}

.file-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.file-info {
    flex: 1;
    min-width: 0;
}

.file-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text-primary);
    word-break: break-all;
    margin-bottom: 4px;
}

.file-size {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.file-status {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
}

.file-status.uploading {
    color: var(--color-accent);
}

.file-status.ready {
    color: var(--color-text-secondary);
}

.file-status.resized,
.file-status.success {
    color: var(--color-success);
}

.file-status.error {
    color: var(--color-error);
}

/* ===== Status Icons ===== */
.status-icon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
}

.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}
/* ===== Progress Bar ===== */
.progress-bar {
    height: 4px;
    background-color: #2d333d;
    border-radius: 2px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-fill {
    height: 100%;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
    border-radius: 2px;
}

.file-item.success .progress-fill {
    background-color: var(--color-success);
}

.file-item.error .progress-fill {
    background-color: var(--color-error);
}

/* ===== File URL ===== */
.file-url {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 12px;
    color: var(--color-text-secondary);
    word-break: break-all;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid var(--color-border);
}

.file-url a {
    color: var(--color-accent);
    text-decoration: none;
}

.file-url a:hover {
    text-decoration: underline;
}

.file-url-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
}

.file-preview {
    width: 88px;
    height: 88px;
    flex-shrink: 0;
    object-fit: cover;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background-color: var(--color-card);
}

@media (max-width: 560px) {
    .file-preview {
        width: 72px;
        height: 72px;
    }
}

/* ===== Copy Button ===== */
.copy-button {
    flex-shrink: 0;
    padding: 4px 10px;
    background-color: transparent;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.copy-button:hover {
    background-color: var(--color-accent);
    color: #0f1419;
}

.copy-button.copied {
    border-color: var(--color-success);
    background-color: var(--color-success);
    color: #0f1419;
}
/* ===== Error Message ===== */
.error-message {
    font-size: 12px;
    color: var(--color-error);
    margin-top: 8px;
    padding: 8px 12px;
    background-color: rgba(255, 107, 107, 0.15);
    border-radius: 4px;
    border-left: 3px solid var(--color-error);
}

/* ===== Retry Button ===== */
.retry-button {
    margin-top: 8px;
    padding: 6px 14px;
    background-color: transparent;
    border: 1px solid var(--color-accent);
    color: var(--color-accent);
    border-radius: 4px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.retry-button:hover {
    background-color: var(--color-accent);
    color: #0f1419;
}

.retry-button:active {
    transform: scale(0.98);
}

/* ===== Responsive ===== */
@media (max-width: 560px) {
    .upload-card {
        padding: 24px;
    }
    
    .title {
        font-size: 20px;
    }
    
    .drop-zone {
        padding: 32px 16px;
    }
    
    .config-row {
        flex-direction: column;
        align-items: stretch;
        gap: 6px;
    }
    
    .config-label {
        text-align: left;
        min-width: auto;
    }
}

/* ===== Accessibility ===== */
.file-input:focus-visible ~ .drop-zone {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

button:focus-visible,
input:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}