:root {
    --alphina-primary: #6C63FF;
    --alphina-primary-dark: #5A52D5;
    --alphina-secondary: #FF6B9D;
    --alphina-bg: #F8F9FC;
    --alphina-surface: #FFFFFF;
    --alphina-text: #2D3748;
    --alphina-text-light: #718096;
    --alphina-border: #E2E8F0;
    --alphina-success: #48BB78;
    --alphina-warning: #ECC94B;
    --alphina-danger: #F56565;
}

body {
    background-color: var(--alphina-bg);
    color: var(--alphina-text);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

.bg-alphina {
    background: linear-gradient(135deg, var(--alphina-primary) 0%, var(--alphina-primary-dark) 100%);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.3rem;
}

.balance-widget {
    font-weight: 600;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    background: rgba(255, 255, 255, 0.15);
    margin-right: 1rem;
}

/* Auth pages */
.auth-container {
    max-width: 400px;
    margin: 100px auto;
}

.auth-card {
    background: var(--alphina-surface);
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    padding: 2.5rem;
}

/* Chat Split-View */
.chat-split-view {
    display: flex;
    height: calc(100vh - 56px);
}

.chat-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    border-right: 1px solid var(--alphina-border);
}

/* Preview Panel */
.preview-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--alphina-bg);
    min-width: 0;
}

.preview-panel-header {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--alphina-border);
    font-weight: 600;
    background: var(--alphina-surface);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.preview-panel-title {
    font-size: 0.95rem;
    color: var(--alphina-text);
}

.preview-toggle-mobile {
    display: none;
    background: none;
    border: none;
    color: var(--alphina-text-light);
    cursor: pointer;
    padding: 0.25rem;
}

.preview-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    position: relative;
}

/* Welcome placeholder */
.preview-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    color: var(--alphina-text-light);
    gap: 1rem;
    padding: 2rem;
}

.preview-welcome-icon {
    font-size: 3rem;
    opacity: 0.3;
}

.preview-welcome h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--alphina-text);
    margin: 0;
}

.preview-welcome p {
    font-size: 0.9rem;
    margin: 0;
    max-width: 280px;
}

/* Outline table in panel */
.preview-outline {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.preview-outline-header {
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--alphina-border);
}

.preview-outline-header h3 {
    font-size: 1.05rem;
    margin: 0 0 0.25rem;
    color: var(--alphina-text);
}

.preview-outline-header .outline-duration {
    font-size: 0.85rem;
}

.preview-outline-phase {
    background: var(--alphina-surface);
    border: 1px solid var(--alphina-border);
    border-radius: 10px;
    padding: 0.875rem 1rem;
}

.preview-outline-phase .outline-phase-header {
    margin-bottom: 0.5rem;
}

.preview-outline-phase .outline-tabs {
    margin-left: 0;
}

.preview-outline-phase .outline-tab {
    padding: 0.3rem 0 0.3rem 0.75rem;
}

.preview-outline-actions {
    padding-top: 0.75rem;
    border-top: 1px solid var(--alphina-border);
    display: flex;
    justify-content: center;
}

.btn-generate {
    background: var(--alphina-primary);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 0.6rem 1.5rem;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-generate:hover {
    background: var(--alphina-primary-dark);
}

/* Progress in panel */
.preview-progress {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    gap: 1rem;
    padding: 2rem;
}

.preview-progress .generation-spinner {
    margin: 0;
}

.preview-progress .gen-steps {
    margin: 0;
}

.preview-progress .gen-progress-bar {
    width: 100%;
    max-width: 300px;
}

/* Workshop iframe preview */
.preview-iframe-wrap {
    display: flex;
    flex-direction: column;
    height: 100%;
    gap: 0;
    margin: -1rem;
}

.preview-iframe-actions {
    display: flex;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--alphina-border);
    background: var(--alphina-surface);
    flex-shrink: 0;
}

.preview-iframe {
    flex: 1;
    width: 100%;
    border: none;
}

.btn-preview-action {
    font-size: 0.8rem;
    padding: 0.35rem 0.75rem;
    border-radius: 6px;
    border: 1px solid var(--alphina-border);
    background: var(--alphina-surface);
    color: var(--alphina-text);
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
}

.btn-preview-action:hover {
    border-color: var(--alphina-primary);
    color: var(--alphina-primary);
}

.btn-preview-action.primary {
    background: var(--alphina-primary);
    color: white;
    border-color: var(--alphina-primary);
}

.btn-preview-action.primary:hover {
    background: var(--alphina-primary-dark);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.message {
    max-width: 80%;
    padding: 0.875rem 1.125rem;
    border-radius: 16px;
    line-height: 1.5;
    word-wrap: break-word;
}

.message-user {
    align-self: flex-end;
    background: var(--alphina-primary);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-assistant {
    align-self: flex-start;
    background: var(--alphina-surface);
    border: 1px solid var(--alphina-border);
    border-bottom-left-radius: 4px;
}

.message-assistant .message-avatar {
    display: inline-flex;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--alphina-primary), var(--alphina-secondary));
    color: white;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    margin-right: 0.5rem;
    vertical-align: middle;
}

.message-cost {
    font-size: 0.7rem;
    color: var(--alphina-text-light);
    margin-top: 0.25rem;
}

.chat-input-area {
    padding: 1rem 1.5rem;
    background: var(--alphina-surface);
    border-top: 1px solid var(--alphina-border);
}

.chat-input-area textarea {
    border-radius: 24px;
    border: 2px solid var(--alphina-border);
    padding: 0.75rem 1.25rem;
    resize: none;
    transition: border-color 0.2s;
}

.chat-input-area textarea:focus {
    border-color: var(--alphina-primary);
    box-shadow: 0 0 0 3px rgba(108, 99, 255, 0.15);
}

.btn-send {
    background: var(--alphina-primary);
    color: white;
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.btn-send:hover {
    background: var(--alphina-primary-dark);
    color: white;
}

.btn-send:disabled {
    opacity: 0.5;
}

/* Typing indicator */
.typing-indicator {
    display: none;
    align-self: flex-start;
    padding: 0.75rem 1rem;
}

.typing-indicator.active {
    display: flex;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--alphina-text-light);
    margin: 0 2px;
    animation: typing 1.4s infinite;
}

.typing-indicator span:nth-child(2) {
    animation-delay: 0.2s;
}

.typing-indicator span:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes typing {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-4px); opacity: 1; }
}

/* Workshop cards */
.workshop-card {
    background: var(--alphina-surface);
    border-radius: 12px;
    border: 1px solid var(--alphina-border);
    padding: 1.5rem;
    transition: box-shadow 0.2s;
}

.workshop-card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

/* Session list */
.session-item {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    text-decoration: none;
    color: var(--alphina-text);
    transition: background 0.2s;
}

.session-item:hover {
    background: rgba(108, 99, 255, 0.06);
    color: var(--alphina-text);
}

.session-item.active {
    background: rgba(108, 99, 255, 0.1);
}

/* Landing page */
.landing-hero {
    text-align: center;
    padding: 6rem 2rem;
    background: linear-gradient(135deg, var(--alphina-primary) 0%, var(--alphina-primary-dark) 100%);
    color: white;
}

.landing-hero h1 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
}

.landing-hero p {
    font-size: 1.25rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.landing-features {
    padding: 4rem 2rem;
}

.feature-card {
    text-align: center;
    padding: 2rem;
}

.feature-card i {
    font-size: 2.5rem;
    color: var(--alphina-primary);
    margin-bottom: 1rem;
}

/* Generation progress (reused in panel) */

.generation-spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--alphina-border);
    border-top-color: var(--alphina-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1.25rem;
}

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

.gen-status-message {
    color: var(--alphina-text-light);
    font-size: 0.9rem;
    margin: 0.25rem 0 1.25rem;
    min-height: 1.4em;
}

.gen-steps {
    text-align: left;
    margin: 0 auto 1.25rem;
    max-width: 300px;
}

.gen-step {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.35rem 0;
    font-size: 0.85rem;
    color: var(--alphina-text-light);
    opacity: 0.4;
    transition: opacity 0.3s, color 0.3s;
}

.gen-step.active {
    opacity: 1;
    color: var(--alphina-primary);
    font-weight: 600;
}

.gen-step.completed {
    opacity: 0.7;
    color: var(--alphina-success);
}

.gen-step-icon {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 2px solid currentColor;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.7rem;
}

.gen-step.active .gen-step-icon {
    background: var(--alphina-primary);
    border-color: var(--alphina-primary);
    animation: pulse-dot 1.5s ease-in-out infinite;
}

.gen-step.completed .gen-step-icon::after {
    content: '\2713';
    color: var(--alphina-success);
    font-weight: 700;
}

@keyframes pulse-dot {
    0%, 100% { box-shadow: 0 0 0 0 rgba(108, 99, 255, 0.4); }
    50% { box-shadow: 0 0 0 6px rgba(108, 99, 255, 0); }
}

.gen-progress-bar {
    height: 4px;
    background: var(--alphina-border);
    border-radius: 2px;
    overflow: hidden;
}

.gen-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--alphina-primary), var(--alphina-primary-light));
    border-radius: 2px;
    width: 0%;
    transition: width 0.5s ease;
}

/* Billing */
.balance-large {
    font-size: 2.5rem;
    font-weight: 700;
}

.transaction-positive {
    color: var(--alphina-success);
}

.transaction-negative {
    color: var(--alphina-danger);
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    color: var(--alphina-text-light);
    font-size: 0.875rem;
}

.footer a {
    color: var(--alphina-text-light);
    text-decoration: none;
}

.footer a:hover {
    color: var(--alphina-primary);
}

/* Outline display */
.outline-card {
    background: var(--alphina-bg);
    border: 1px solid var(--alphina-border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-top: 0.75rem;
}

.outline-header {
    font-size: 1.05rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--alphina-border);
}

.outline-duration {
    color: var(--alphina-text-light);
    font-weight: 400;
}

.outline-phase {
    margin-bottom: 0.75rem;
}

.outline-phase-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.35rem;
}

.outline-phase-badge {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
}

.phase-badge-1 { background: #e8f4f8; color: #1a6b7a; }
.phase-badge-2 { background: #e8f0e8; color: #2d6a2d; }
.phase-badge-3 { background: #f0e8f4; color: #6a2d8a; }
.phase-badge-4 { background: #f4ece8; color: #8a5a2d; }
.phase-badge-5 { background: #f4e8e8; color: #8a2d2d; }
.phase-badge-6 { background: #e8e8f4; color: #2d2d8a; }

.outline-phase-duration {
    font-size: 0.8rem;
    color: var(--alphina-text-light);
}

.outline-tabs {
    list-style: none;
    padding: 0;
    margin: 0 0 0 0.25rem;
}

.outline-tab {
    padding: 0.2rem 0 0.2rem 0.75rem;
    font-size: 0.9rem;
    border-left: 2px solid var(--alphina-border);
}

.outline-tab-number {
    font-weight: 600;
    color: var(--alphina-primary);
    font-size: 0.8rem;
}

.outline-tab-desc {
    color: var(--alphina-text-light);
    font-size: 0.85rem;
}

/* Review banner */
.review-banner {
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 0.5rem 1.5rem;
    background: linear-gradient(90deg, rgba(108, 99, 255, 0.08), rgba(255, 107, 157, 0.08));
    border-bottom: 1px solid var(--alphina-border);
    font-size: 0.85rem;
    color: var(--alphina-text);
}

.review-banner .review-badge {
    background: var(--alphina-primary);
    color: white;
    font-size: 0.7rem;
    font-weight: 700;
    padding: 0.15rem 0.5rem;
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.review-hint {
    background: rgba(108, 99, 255, 0.06);
    border: 1px solid rgba(108, 99, 255, 0.15);
    border-radius: 8px;
    padding: 0.75rem 1rem;
    font-size: 0.85rem;
    line-height: 1.5;
}

.review-hint em {
    color: var(--alphina-primary);
}

/* Responsive */
@media (max-width: 768px) {
    .chat-split-view {
        flex-direction: column;
    }

    .chat-panel {
        flex: 1;
        border-right: none;
        border-bottom: 1px solid var(--alphina-border);
    }

    .preview-panel {
        max-height: 50vh;
        border-top: 1px solid var(--alphina-border);
    }

    .preview-panel.collapsed .preview-panel-content {
        display: none;
    }

    .preview-toggle-mobile {
        display: block;
    }

    .message {
        max-width: 95%;
    }

    .landing-hero h1 {
        font-size: 2rem;
    }

    .outline-card {
        padding: 0.75rem;
    }
}