/* ===== CSS Variables ===== */
:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #0ea5e9;
    --accent: #f43f5e;
    --success: #10b981;
    --warning: #f59e0b;
    --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --card-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

/* ===== Navbar ===== */
.navbar {
    background: rgba(255, 255, 255, 0.9) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 0;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    background: var(--bg-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.025em;
}

.brand-icon {
    width: 24px;
    height: 24px;
    margin-right: 8px;
    vertical-align: -4px;
}

.nav-link {
    color: var(--text-secondary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary) !important;
    background: rgba(99, 102, 241, 0.1);
}

/* ===== Main Container ===== */
.main-container {
    padding: 2rem 1rem;
    min-height: calc(100vh - 60px);
    display: flex;
    align-items: flex-start;
    justify-content: center;
}

/* ===== Footer ===== */
.site-footer {
    margin-top: 2rem;
    padding: 1.5rem 1rem;
    background: rgba(255, 255, 255, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.25);
    box-shadow: var(--shadow-sm);
}

.site-footer .footer-content {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.6;
}

.site-footer p {
    margin: 0.25rem 0;
}

.site-footer .footer-links-center {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
}

.site-footer .footer-links-center a:first-child {
    justify-self: end;
}

.site-footer .footer-links-center a:last-child {
    justify-self: start;
}

.site-footer .footer-center-gap {
    white-space: pre;
}

.site-footer a {
    color: var(--text-secondary);
    text-decoration: none;
}

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

/* ===== Card Styles ===== */
.card {
    background: var(--card-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 25px 30px -5px rgb(0 0 0 / 0.15);
}

.card-body {
    padding: 2rem;
}

.card-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    letter-spacing: -0.025em;
}

.card-subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
}

/* ===== File Upload Zone ===== */
.upload-zone {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    position: relative;
    overflow: hidden;
}

.upload-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: var(--bg-gradient);
    opacity: 0;
    transition: var(--transition);
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--primary);
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
}

.upload-zone:hover::before,
.upload-zone.dragover::before {
    opacity: 0.05;
}

.upload-zone-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 1rem;
    background: var(--bg-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    box-shadow: var(--shadow-lg);
}

.upload-zone-text {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
}

.upload-zone-hint {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    opacity: 0;
    cursor: pointer;
}

/* ===== File List ===== */
.file-list {
    margin-top: 1rem;
    max-height: 150px;
    overflow-y: auto;
}

.file-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    background: #f8fafc;
    border-radius: var(--radius-md);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: move;
    transition: var(--transition);
}

.file-item-icon {
    color: var(--primary);
    margin-right: 0.75rem;
}

.file-item-name {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.file-item-remove {
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.file-item-remove:hover {
    color: var(--accent);
    background: rgba(244, 63, 94, 0.1);
}

.file-item.dragging {
    opacity: 0.5;
}

.file-item.dragover {
    border: 1px dashed var(--primary);
}

/* ===== Section Styles ===== */
.section-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section-title svg {
    width: 16px;
    height: 16px;
}

/* ===== Select Styles ===== */
.form-select {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--text-primary);
    background-color: white;
    transition: var(--transition);
    cursor: pointer;
}

.form-input {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.75rem 1rem;
    font-size: 0.95rem;
    color: var(--text-primary);
    background-color: white;
    transition: var(--transition);
}

.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    outline: none;
}

.form-input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.15);
    outline: none;
}

.is-hidden {
    display: none !important;
}

.api-provider {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 0.75rem;
    align-items: center;
    margin-top: 0.75rem;
}

.api-provider-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
}

.custom-api-fields {
    display: grid;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

/* ===== Checkbox Styles ===== */
.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
}

.form-check {
    margin: 0;
    padding: 0;
}

.option-card {
    display: flex;
    align-items: center;
    padding: 0.875rem 1rem;
    background: #f8fafc;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.option-card.is-disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.option-card.is-disabled:hover {
    background: #f8fafc;
    border-color: transparent;
}

.option-card:hover {
    background: #f1f5f9;
    border-color: var(--border-color);
}

.option-card.selected {
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    border-color: var(--primary-light);
}

.option-card input[type="checkbox"] {
    width: 18px;
    height: 18px;
    margin-right: 0.75rem;
    accent-color: var(--primary);
    cursor: pointer;
}

.option-card.is-disabled input[type="checkbox"] {
    cursor: not-allowed;
}

.option-card label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    cursor: pointer;
    margin: 0;
    flex: 1;
}

.option-card.selected label {
    color: var(--primary-dark);
    font-weight: 500;
}

/* ===== Button Styles ===== */
.btn {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--bg-gradient);
    border: none;
    color: white;
    box-shadow: var(--shadow-md), 0 4px 14px 0 rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg), 0 6px 20px 0 rgba(99, 102, 241, 0.5);
    background: linear-gradient(135deg, #5a67d8 0%, #6b46c1 100%);
}

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

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

.btn-secondary:hover {
    background: #f8fafc;
    border-color: var(--primary-light);
    color: var(--primary);
}

.btn-group {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.5rem;
}

/* ===== Progress Bar ===== */
.progress-container {
    margin-top: 1.5rem;
    padding: 1rem;
    background: #f8fafc;
    border-radius: var(--radius-md);
}

.progress {
    height: 8px;
    background: var(--border-color);
    border-radius: 999px;
    overflow: hidden;
}

.progress-bar {
    background: var(--bg-gradient);
    border-radius: 999px;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    text-align: center;
}

/* ===== Divider ===== */
.divider {
    height: 1px;
    background: var(--border-color);
    margin: 1.5rem 0;
}

/* ===== Help Page ===== */
.help-content {
    font-size: 0.95rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

.help-content h6 {
    color: var(--primary);
    font-weight: 600;
    margin-top: 1.5rem;
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

.help-content ol,
.help-content ul {
    padding-left: 1.5rem;
}

.help-content li {
    margin-bottom: 0.5rem;
}

.help-content .deep-red {
    color: #7a0000;
}

.tip-box {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: linear-gradient(135deg, #eef2ff 0%, #e0e7ff 100%);
    border: 1px solid var(--primary-light);
    border-radius: var(--radius-md);
    color: var(--primary-dark);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .card-body {
        padding: 1.5rem;
    }

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

    .btn-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}

/* ===== Tooltip Styles ===== */
.option-card {
    position: relative;
}

.option-card[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    padding: 0.75rem 1rem;
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    color: white;
    font-size: 0.8rem;
    font-weight: 400;
    line-height: 1.5;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    white-space: normal;
    width: max-content;
    max-width: 280px;
    text-align: left;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}

.option-card[data-tooltip]::before {
    content: '';
    position: absolute;
    bottom: calc(100% + 2px);
    left: 50%;
    transform: translateX(-50%);
    border: 6px solid transparent;
    border-top-color: #1e293b;
    z-index: 1001;
    opacity: 0;
    visibility: hidden;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.option-card[data-tooltip]:hover::after,
.option-card[data-tooltip]:hover::before {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.option-card[data-tooltip]:hover::before {
    transform: translateX(-50%);
}

/* ===== Terms Agreement ===== */
.terms-check {
    margin: 1rem 0 1.25rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-left: 0;
}

.terms-check a {
    color: var(--primary);
    text-decoration: none;
}

.terms-check a:hover {
    text-decoration: underline;
}

.terms-check .form-check-input {
    border-color: var(--border-color);
    margin: 0;
    flex-shrink: 0;
}

/* Tooltip position adjustment for edge cases */
@media (max-width: 768px) {
    .option-card[data-tooltip]::after {
        left: 0;
        transform: translateX(0) translateY(5px);
        max-width: 250px;
    }

    .option-card[data-tooltip]:hover::after {
        transform: translateX(0) translateY(0);
    }

    .option-card[data-tooltip]::before {
        left: 20px;
        transform: translateX(0);
    }

    .option-card[data-tooltip]:hover::before {
        transform: translateX(0);
    }
}

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

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 999px;
}

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