/* Alexandra's Brain — Brand Styles
 * Based on: ~/Desktop/Health Business Projects/Coaching 2.0/assets/brand-kit.md
 */

:root {
    /* Primary Colors */
    --color-accent-gold: #F5D76E;
    --color-peach: #FDDDD2;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F5F5F5;
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #4A4A4A;

    /* Accent Colors */
    --color-emphasis-orange: #E8922A;
    --color-dark-overlay: #2C2C2C;
    --color-sage: #8A8B72;

    /* Functional */
    --color-success: #4CAF50;
    --color-error: #E53935;
    --color-warning: #FFA726;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

/* ==========================================================================
   Reset & Base
   ========================================================================== */

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background: linear-gradient(135deg, var(--color-peach) 0%, #FFF5F0 50%, var(--color-bg) 100%);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================================================
   Typography
   ========================================================================== */

h1 {
    font-size: 1.75rem;
    font-weight: 700;
    line-height: 1.2;
}

h2 {
    font-size: 1.375rem;
    font-weight: 600;
    line-height: 1.3;
}

h3 {
    font-size: 1.125rem;
    font-weight: 600;
    line-height: 1.4;
}

small, .text-small {
    font-size: 0.8125rem;
    line-height: 1.5;
}

a {
    color: var(--color-emphasis-orange);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* ==========================================================================
   Utility
   ========================================================================== */

.hidden {
    display: none !important;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
}

/* ==========================================================================
   Login Page
   ========================================================================== */

.login-view {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--spacing-md);
}

.login-card {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.08);
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
    width: 100%;
    max-width: 400px;
    text-align: center;
    animation: fadeInUp 0.4s ease-out;
}

.login-card .brand-logo {
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.login-card h1 {
    margin-bottom: var(--spacing-xs);
    color: var(--color-dark-overlay);
}

.login-card .subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-lg);
}

.form-group {
    margin-bottom: var(--spacing-md);
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.form-group input {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 1.5px solid #DDD;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    outline: none;
    background: var(--color-bg);
}

.form-group input:focus {
    border-color: var(--color-accent-gold);
    box-shadow: 0 0 0 3px rgba(245, 215, 110, 0.25);
}

.btn-primary {
    width: 100%;
    padding: 0.75rem;
    background: var(--color-accent-gold);
    color: var(--color-dark-overlay);
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background: var(--color-emphasis-orange);
    color: var(--color-bg);
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.error-message {
    color: var(--color-error);
    font-size: 0.8125rem;
    margin-top: var(--spacing-sm);
    min-height: 1.25rem;
}

/* ==========================================================================
   Chat Layout
   ========================================================================== */

.chat-view {
    display: flex;
    flex-direction: column;
    height: 100vh;
    background: var(--color-bg);
}

.chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg);
    border-bottom: 1px solid #EEE;
    flex-shrink: 0;
}

.chat-header .brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.chat-header .brand-icon {
    font-size: 1.5rem;
}

.chat-header .brand-name {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-dark-overlay);
}

.chat-header .user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.chat-header .user-email {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.btn-logout {
    background: none;
    border: 1.5px solid var(--color-sage);
    color: var(--color-sage);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.btn-logout:hover {
    background: var(--color-sage);
    color: var(--color-bg);
}

/* Message area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #CCC;
    border-radius: 3px;
}

/* Chat bubbles */
.message {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    animation: messageAppear 0.3s ease-out;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.message.assistant .message-avatar {
    background: var(--color-peach);
}

.message.user .message-avatar {
    background: var(--color-accent-gold);
}

.message-content {
    max-width: 72%;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-lg);
    font-size: 0.9375rem;
    line-height: 1.6;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--color-accent-gold);
    color: var(--color-dark-overlay);
    border-bottom-right-radius: var(--radius-sm);
}

.message.assistant .message-content {
    background: var(--color-bg);
    border: 1.5px solid var(--color-sage);
    color: var(--color-text-primary);
    border-bottom-left-radius: var(--radius-sm);
}

.message-content p {
    margin-bottom: 0.5em;
}

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

.message-content strong {
    font-weight: 600;
}

/* Source references */
.source-references {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid #E5E5E5;
}

.source-toggle {
    background: none;
    border: none;
    color: var(--color-sage);
    font-family: var(--font-primary);
    font-size: 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0;
    transition: color 0.2s;
}

.source-toggle:hover {
    color: var(--color-emphasis-orange);
}

.source-toggle .arrow {
    display: inline-block;
    transition: transform 0.2s;
    font-size: 0.625rem;
}

.source-toggle.open .arrow {
    transform: rotate(90deg);
}

.source-list {
    display: none;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-xs);
}

.source-list.open {
    display: flex;
}

.source-pill {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    background: var(--color-bg-alt);
    border: 1px solid #E0E0E0;
    border-radius: 999px;
    padding: 0.1875rem 0.625rem;
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
}

.source-pill .score {
    color: var(--color-sage);
    font-weight: 600;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    animation: messageAppear 0.3s ease-out;
}

.typing-indicator .message-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-peach);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}

.typing-dots {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0.75rem 1rem;
    background: var(--color-bg);
    border: 1.5px solid var(--color-sage);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: var(--radius-sm);
}

.typing-dots span {
    width: 8px;
    height: 8px;
    background: var(--color-sage);
    border-radius: 50%;
    animation: typingBounce 1.2s ease-in-out infinite;
}

.typing-dots span:nth-child(2) {
    animation-delay: 0.15s;
}

.typing-dots span:nth-child(3) {
    animation-delay: 0.3s;
}

/* Input area */
.chat-input-area {
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg);
    border-top: 1px solid #EEE;
    flex-shrink: 0;
}

.chat-input-wrapper {
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-end;
    max-width: 800px;
    margin: 0 auto;
}

.chat-input-wrapper textarea {
    flex: 1;
    padding: 0.625rem 0.875rem;
    border: 1.5px solid #DDD;
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    min-height: 44px;
    max-height: 120px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.chat-input-wrapper textarea:focus {
    border-color: var(--color-accent-gold);
    box-shadow: 0 0 0 3px rgba(245, 215, 110, 0.25);
}

.btn-send {
    width: 44px;
    height: 44px;
    background: var(--color-accent-gold);
    color: var(--color-dark-overlay);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.25rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background 0.2s, transform 0.1s;
}

.btn-send:hover {
    background: var(--color-emphasis-orange);
    color: var(--color-bg);
}

.btn-send:active {
    transform: scale(0.95);
}

.btn-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.char-counter {
    text-align: right;
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.char-counter.warning {
    color: var(--color-emphasis-orange);
    font-weight: 600;
}

.char-counter.over {
    color: var(--color-error);
    font-weight: 700;
}

/* ==========================================================================
   Admin Panel
   ========================================================================== */

.admin-view {
    min-height: 100vh;
    background: linear-gradient(135deg, var(--color-peach) 0%, #FFF5F0 50%, var(--color-bg) 100%);
}

.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg);
    border-bottom: 1px solid #EEE;
}

.admin-header .brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.admin-header .brand-icon {
    font-size: 1.5rem;
}

.admin-header .brand-name {
    font-weight: 700;
    font-size: 1.125rem;
    color: var(--color-dark-overlay);
}

.admin-header .user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.admin-header .user-email {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.admin-content {
    max-width: 960px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* Stats cards */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-dark-overlay);
    line-height: 1;
}

.stat-card .stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
}

/* Upload zone */
.upload-section {
    margin-bottom: var(--spacing-xl);
}

.upload-section h2 {
    margin-bottom: var(--spacing-md);
}

.upload-zone {
    border: 2px dashed var(--color-sage);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
    background: var(--color-bg);
    transition: border-color 0.2s, background 0.2s;
    cursor: pointer;
    position: relative;
}

.upload-zone:hover,
.upload-zone.dragover {
    border-color: var(--color-accent-gold);
    background: rgba(245, 215, 110, 0.05);
}

.upload-zone .upload-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.upload-zone p {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.upload-zone .formats {
    font-size: 0.75rem;
    color: var(--color-sage);
}

.upload-zone input[type="file"] {
    display: none;
}

.btn-upload-select {
    background: var(--color-accent-gold);
    color: var(--color-dark-overlay);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.5rem 1.25rem;
    font-family: var(--font-primary);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: var(--spacing-sm);
    transition: background 0.2s;
}

.btn-upload-select:hover {
    background: var(--color-emphasis-orange);
    color: var(--color-bg);
}

/* Upload progress */
.upload-progress {
    margin-top: var(--spacing-md);
}

.upload-progress.hidden {
    display: none;
}

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

.progress-bar-fill {
    height: 100%;
    background: var(--color-accent-gold);
    border-radius: 999px;
    width: 0%;
    transition: width 0.3s ease;
}

.upload-status {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-xs);
    text-align: center;
}

.upload-status.success {
    color: var(--color-success);
}

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

/* File table */
.files-section h2 {
    margin-bottom: var(--spacing-md);
}

.file-table-wrapper {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    overflow: hidden;
}

.file-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

.file-table thead {
    background: var(--color-bg-alt);
}

.file-table th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.file-table td {
    padding: 0.75rem 1rem;
    border-top: 1px solid #F0F0F0;
    vertical-align: middle;
}

.file-table tbody tr:nth-child(even) {
    background: var(--color-bg-alt);
}

.file-table tbody tr:hover {
    background: rgba(253, 221, 210, 0.2);
}

.badge {
    display: inline-block;
    padding: 0.125rem 0.5rem;
    border-radius: 999px;
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-pdf {
    background: #FDECEA;
    color: #C62828;
}

.badge-txt {
    background: #E8F5E9;
    color: #2E7D32;
}

.badge-md {
    background: #E3F2FD;
    color: #1565C0;
}

.badge-default {
    background: var(--color-bg-alt);
    color: var(--color-text-secondary);
}

.btn-delete {
    background: none;
    border: 1.5px solid var(--color-error);
    color: var(--color-error);
    border-radius: var(--radius-sm);
    padding: 0.25rem 0.625rem;
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.btn-delete:hover {
    background: var(--color-error);
    color: var(--color-bg);
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-secondary);
}

.empty-state .empty-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 0.9375rem;
}

/* Confirm dialog overlay */
.confirm-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease-out;
}

.confirm-dialog {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    max-width: 360px;
    width: 90%;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
    text-align: center;
}

.confirm-dialog p {
    margin-bottom: var(--spacing-lg);
    font-size: 0.9375rem;
}

.confirm-dialog .confirm-actions {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.confirm-dialog .btn-confirm-yes {
    background: var(--color-error);
    color: var(--color-bg);
    border: none;
    border-radius: var(--radius-md);
    padding: 0.5rem 1.5rem;
    font-family: var(--font-primary);
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.confirm-dialog .btn-confirm-yes:hover {
    opacity: 0.85;
}

.confirm-dialog .btn-confirm-no {
    background: none;
    border: 1.5px solid #CCC;
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    padding: 0.5rem 1.5rem;
    font-family: var(--font-primary);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.confirm-dialog .btn-confirm-no:hover {
    background: var(--color-bg-alt);
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
    }
    30% {
        transform: translateY(-6px);
    }
}

/* ==========================================================================
   Responsive — Mobile-first
   ========================================================================== */

@media (max-width: 768px) {
    .chat-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .chat-header .user-email {
        display: none;
    }

    .chat-messages {
        padding: var(--spacing-md);
    }

    .message-content {
        max-width: 85%;
    }

    .chat-input-area {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .admin-content {
        padding: var(--spacing-md);
    }

    .stats-bar {
        grid-template-columns: 1fr 1fr;
    }

    .file-table {
        font-size: 0.8125rem;
    }

    .file-table th,
    .file-table td {
        padding: 0.5rem 0.625rem;
    }

    /* Stack table on very small screens */
    .file-table thead {
        display: none;
    }

    .file-table,
    .file-table tbody,
    .file-table tr,
    .file-table td {
        display: block;
    }

    .file-table tr {
        padding: var(--spacing-md);
        border-bottom: 1px solid #EEE;
    }

    .file-table td {
        border-top: none;
        padding: 0.25rem 0;
    }

    .file-table td::before {
        content: attr(data-label);
        font-weight: 600;
        color: var(--color-text-secondary);
        font-size: 0.6875rem;
        text-transform: uppercase;
        display: block;
    }

    .login-card {
        padding: var(--spacing-lg);
    }

    .admin-header {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .admin-header .user-email {
        display: none;
    }

    .confirm-dialog {
        width: 95%;
    }
}

@media (max-width: 400px) {
    .stats-bar {
        grid-template-columns: 1fr;
    }
}