/* ============================================
   Chatbot SaaS – Premium Dark Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ── CSS Variables ──────────────────────────── */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a2e;
    --bg-glass: rgba(26, 26, 46, 0.6);
    --bg-glass-hover: rgba(26, 26, 46, 0.85);

    --text-primary: #e8e8f0;
    --text-secondary: #9d9db5;
    --text-muted: #5e5e7a;

    --accent-primary: #6c63ff;
    --accent-secondary: #a855f7;
    --accent-gradient: linear-gradient(135deg, #6c63ff 0%, #a855f7 50%, #ec4899 100%);
    --accent-glow: rgba(108, 99, 255, 0.3);

    --border-color: rgba(255, 255, 255, 0.06);
    --border-active: rgba(108, 99, 255, 0.4);

    --success: #22c55e;
    --error: #ef4444;
    --warning: #f59e0b;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 40px rgba(108, 99, 255, 0.15);

    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

    --sidebar-width: 300px;
    --header-height: 64px;
}

/* ── Reset & Base ──────────────────────────── */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* ── Auth Page ─────────────────────────────── */
.auth-container {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-primary);
    position: relative;
    overflow: hidden;
}

.auth-container::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(
        circle at 30% 40%,
        rgba(108, 99, 255, 0.08) 0%,
        transparent 50%
    ),
    radial-gradient(
        circle at 70% 60%,
        rgba(168, 85, 247, 0.06) 0%,
        transparent 50%
    );
    animation: bgFloat 20s ease-in-out infinite;
}

@keyframes bgFloat {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, -2%) rotate(1deg); }
    66% { transform: translate(-1%, 1%) rotate(-0.5deg); }
}

.auth-card {
    position: relative;
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    animation: cardSlideIn 0.6s var(--transition-slow) both;
}

@keyframes cardSlideIn {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.96);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.auth-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    margin-bottom: 8px;
}

.auth-logo img {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-md);
}

.auth-logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 32px;
}

.auth-tabs {
    display: flex;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 4px;
    margin-bottom: 28px;
}

.auth-tab {
    flex: 1;
    padding: 10px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: all var(--transition-base);
}

.auth-tab.active {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.4);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    outline: none;
}

.form-group input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.btn-primary {
    width: 100%;
    padding: 14px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px rgba(108, 99, 255, 0.4);
}

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

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

.auth-error {
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.2);
    color: var(--error);
    padding: 12px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    margin-bottom: 16px;
    display: none;
    animation: shakeError 0.4s ease;
}

@keyframes shakeError {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

.auth-error.show {
    display: block;
}

/* ── Chat Layout ──────────────────────────── */
.chat-app {
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ── Sidebar ──────────────────────────────── */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-slow);
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.sidebar-logo img {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-sm);
}

.sidebar-logo span {
    font-size: 1.1rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.btn-new-chat {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-tertiary);
    border: 1px dashed var(--border-active);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-new-chat:hover {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.3);
}

.btn-new-chat svg {
    width: 18px;
    height: 18px;
}

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px;
}

.conversation-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 14px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: 4px;
}

.conversation-item:hover {
    background: var(--bg-glass-hover);
}

.conversation-item.active {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-active);
}

.conversation-item .conv-title {
    flex: 1;
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-right: 8px;
}

.conversation-item.active .conv-title {
    color: var(--text-primary);
}

.conversation-item .conv-delete {
    opacity: 0;
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.conversation-item:hover .conv-delete {
    opacity: 1;
}

.conversation-item .conv-delete:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border-color);
}

.user-info {
    display: flex;
    align-items: center;
    gap: 12px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--accent-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.85rem;
    color: white;
    flex-shrink: 0;
}

.user-email {
    flex: 1;
    font-size: 0.8rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.btn-logout {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 6px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.btn-logout:hover {
    color: var(--error);
    background: rgba(239, 68, 68, 0.1);
}

/* ── Main Chat ────────────────────────────── */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.chat-header {
    height: var(--header-height);
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border-color);
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    flex-shrink: 0;
}

.chat-header-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.btn-sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

/* ── Messages Area ────────────────────────── */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.empty-state {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    gap: 12px;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    opacity: 0.3;
}

.empty-state h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.empty-state p {
    font-size: 0.9rem;
}

.message {
    display: flex;
    gap: 12px;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    animation: messageSlideIn 0.35s var(--transition-slow) both;
}

@keyframes messageSlideIn {
    from {
        opacity: 0;
        transform: translateY(12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 600;
    flex-shrink: 0;
    margin-top: 2px;
}

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

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--accent-primary);
}

.message-content {
    flex: 1;
    min-width: 0;
}

.message-role {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}

.message.user .message-role {
    color: var(--accent-primary);
}

.message.assistant .message-role {
    color: var(--accent-secondary);
}

.message-body {
    font-size: 0.925rem;
    line-height: 1.7;
    color: var(--text-primary);
}

.message-body p {
    margin-bottom: 8px;
}

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

.message-body code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
    color: var(--accent-secondary);
}

.message-body pre {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.message-body pre code {
    background: none;
    padding: 0;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.message-body ul, .message-body ol {
    margin: 8px 0;
    padding-left: 24px;
}

.message-body li {
    margin-bottom: 4px;
}

.message-body blockquote {
    border-left: 3px solid var(--accent-primary);
    padding-left: 16px;
    color: var(--text-secondary);
    margin: 12px 0;
}

/* ── Typing Indicator ─────────────────────── */
.typing-indicator {
    display: none;
    gap: 12px;
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    animation: messageSlideIn 0.35s ease both;
}

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

.typing-dots {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 12px 0;
}

.typing-dots span {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent-primary);
    animation: typingBounce 1.4s ease-in-out infinite;
}

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

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

@keyframes typingBounce {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.4;
    }
    30% {
        transform: translateY(-8px);
        opacity: 1;
    }
}

/* ── Input Area ───────────────────────────── */
.chat-input-area {
    padding: 16px 24px 24px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.chat-input-wrapper {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 8px 8px 8px 20px;
    transition: all var(--transition-base);
}

.chat-input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

#messageInput {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    line-height: 1.5;
    resize: none;
    outline: none;
    min-height: 24px;
    max-height: 120px;
    padding: 8px 0;
}

#messageInput::placeholder {
    color: var(--text-muted);
}

.btn-send {
    width: 44px;
    height: 44px;
    background: var(--accent-gradient);
    border: none;
    border-radius: var(--radius-md);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    flex-shrink: 0;
}

.btn-send:hover {
    transform: scale(1.05);
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.4);
}

.btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

.btn-send svg {
    width: 20px;
    height: 20px;
}

.chat-disclaimer {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 8px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* ── Loading Spinner ──────────────────────── */
.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    display: inline-block;
}

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

/* ── Responsive ───────────────────────────── */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        z-index: 100;
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 99;
    }

    .sidebar-overlay.show {
        display: block;
    }

    .btn-sidebar-toggle {
        display: block;
    }

    .chat-input-wrapper {
        padding: 6px 6px 6px 14px;
    }

    .messages-container {
        padding: 16px;
    }
}