/* ================================================
   Personal Assistant PWA — Design System v2
   Desktop sidebar + mobile responsive
   ================================================ */

:root {
    --color-bg: #FFFFFF;
    --color-text: #1A1A1A;
    --color-text-muted: #6B7280;
    --color-border: #E5E7EB;
    --color-border-focus: #1663DE;
    --gradient-primary: linear-gradient(90deg, rgba(22, 99, 222, 1) 0%, rgba(128, 196, 232, 1) 100%);
    --color-blue-start: #1663DE;
    --color-blue-end: #80C4E8;
    --color-user-bubble: #BFDBFE;
    --color-assistant-bubble: #F3F4F6;
    --color-error: #DC2626;
    --color-success: #16A34A;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --header-height: 56px;
    --sidebar-width: 280px;
}

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

html, body {
    height: 100%;
    font-family: var(--font-stack);
    font-size: 16px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow: hidden;
}

/* ---- Buttons ---- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: opacity 0.15s, transform 0.1s;
    -webkit-tap-highlight-color: transparent;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--gradient-primary);
    color: #FFFFFF;
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    padding: 8px;
}

.btn-ghost:hover {
    color: var(--color-text);
}

/* ---- Inputs ---- */

.input-field {
    width: 100%;
    padding: 12px 14px;
    font-size: 1rem;
    font-family: var(--font-stack);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color 0.15s;
}

.input-field:focus {
    border-color: var(--color-border-focus);
}

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

/* ---- Login page ---- */

.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 24px;
}

.login-card {
    width: 100%;
    max-width: 380px;
    padding: 32px 28px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.login-card h1 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.login-bot-icon {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.login-card .subtitle {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 28px;
}

.login-card .form-group {
    margin-bottom: 16px;
}

.login-card label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--color-text);
}

.login-card .btn-primary {
    width: 100%;
    margin-top: 8px;
    padding: 12px;
}

.login-error {
    color: var(--color-error);
    font-size: 0.85rem;
    text-align: center;
    margin-top: 12px;
    min-height: 1.2em;
}

/* ================================================
   App layout — Sidebar + Chat
   ================================================ */

.app-layout {
    display: flex;
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
}

/* ---- Sidebar overlay (mobile) ---- */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    z-index: 40;
    opacity: 0;
    transition: opacity 0.25s ease;
}

.sidebar-overlay.visible {
    display: block;
    opacity: 1;
}

/* ---- Sidebar ---- */
.sidebar {
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    height: 100%;
    display: flex;
    flex-direction: column;
    background: #FAFAFA;
    border-right: 1px solid var(--color-border);
    z-index: 50;
    overflow: hidden;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    padding-top: calc(var(--header-height) + 12px + env(safe-area-inset-top, 0px));
    flex-shrink: 0;
}

.sidebar-header h2 {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.sidebar-header .btn-new-chat {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: 20px;
}

.sidebar-conversations {
    flex: 1;
    overflow-y: auto;
    padding: 0 8px 16px;
}

.sidebar-conversations::-webkit-scrollbar {
    width: 4px;
}
.sidebar-conversations::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 12px;
    margin-bottom: 2px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.12s;
    position: relative;
}

.conversation-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

.conversation-item.active {
    background: rgba(22, 99, 222, 0.08);
}

.conversation-item-title {
    flex: 1;
    font-size: 0.88rem;
    color: var(--color-text);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.conversation-item.active .conversation-item-title {
    font-weight: 600;
    color: var(--color-blue-start);
}

.conversation-item-delete {
    display: none;
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: 2px 4px;
    font-size: 0.8rem;
    border-radius: 4px;
    flex-shrink: 0;
}

.conversation-item:hover .conversation-item-delete {
    display: block;
}

.conversation-item-delete:hover {
    color: var(--color-error);
    background: rgba(220, 38, 38, 0.08);
}

.sidebar-footer {
    padding: 12px 16px;
    padding-bottom: calc(12px + env(safe-area-inset-bottom, 0px));
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.sidebar-footer .btn-google-connect {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.sidebar-footer .btn-google-connect:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
}

.sidebar-footer .btn-google-connect.connected {
    color: #16a34a;
    border-color: #16a34a44;
}

.sidebar-footer .btn-google-connect.disconnected {
    color: #dc2626;
    border-color: #dc262644;
}

.sidebar-footer .btn-notion-status {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px;
    margin-bottom: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.sidebar-footer .btn-notion-status:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
}

.sidebar-footer .btn-notion-status.connected {
    color: #16a34a;
    border-color: #16a34a44;
}

.sidebar-footer .btn-notion-status.disconnected {
    color: #dc2626;
    border-color: #dc262644;
}

.sidebar-footer .btn-notion-status.partial {
    color: #d97706;
    border-color: #d9770644;
}

/* Notion status modal */
.notion-modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 200;
    align-items: center;
    justify-content: center;
}
.notion-modal-overlay.visible {
    display: flex;
}
.notion-modal {
    background: var(--color-bg);
    border-radius: var(--radius-md);
    padding: 24px;
    min-width: 280px;
    max-width: 360px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}
.notion-modal h3 {
    margin: 0 0 16px;
    font-size: 1rem;
    font-weight: 600;
}
.notion-modal-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 0;
    font-size: 0.9rem;
    border-bottom: 1px solid var(--color-border);
}
.notion-modal-item:last-child {
    border-bottom: none;
}
.notion-modal-item .status-ok { color: #16a34a; }
.notion-modal-item .status-error { color: #dc2626; }
.notion-modal-item .status-na { color: var(--color-text-muted); }
.notion-modal-close {
    margin-top: 16px;
    width: 100%;
    padding: 8px;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--color-text-muted);
}
.notion-modal-close:hover {
    background: rgba(0,0,0,0.04);
    color: var(--color-text);
}
.notion-spinner {
    display: flex;
    justify-content: center;
    padding: 24px 0;
}
.notion-spinner::after {
    content: '';
    width: 24px;
    height: 24px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-blue-start);
    border-radius: 50%;
    animation: notion-spin 0.6s linear infinite;
}
@keyframes notion-spin {
    to { transform: rotate(360deg); }
}

.sidebar-footer .btn-logout {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 8px;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}

.sidebar-footer .btn-logout:hover {
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-text);
}

/* ---- Chat main area ---- */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    height: 100%;
    overflow-y: auto;
    position: relative;
}

/* ---- Header (blur, full width, fixed) ---- */
.chat-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 30;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 16px;
    background: rgba(255, 255, 255, 0.55);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(229, 231, 235, 0.7);
}

.chat-header h1 {
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 8px;
}

.header-bot-icon {
    width: 28px;
    height: 28px;
    object-fit: contain;
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-header-actions {
    display: flex;
    gap: 4px;
}

.btn-hamburger {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 6px;
    color: var(--color-text);
    font-size: 1.3rem;
    line-height: 1;
    border-radius: var(--radius-sm);
    -webkit-tap-highlight-color: transparent;
}

.btn-hamburger:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* ---- Chat messages ---- */
.chat-messages {
    flex: 1;
    padding: 16px;
    padding-top: calc(var(--header-height) + 16px);
    padding-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    -webkit-overflow-scrolling: touch;
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
}

/* ---- Message bubbles ---- */

.message {
    max-width: 85%;
    padding: 10px 14px;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    line-height: 1.55;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

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

.message-assistant {
    align-self: flex-start;
    background: var(--color-assistant-bubble);
    border-bottom-left-radius: 4px;
}

.message-assistant img {
    max-width: 100%;
    border-radius: var(--radius-sm);
    margin-top: 8px;
}

/* Markdown inside messages */
.message-assistant p { margin-bottom: 8px; }
.message-assistant p:last-child { margin-bottom: 0; }
.message-assistant ul, .message-assistant ol { padding-left: 20px; margin-bottom: 8px; }
.message-assistant code {
    background: rgba(0, 0, 0, 0.06);
    padding: 1px 5px;
    border-radius: 4px;
    font-size: 0.88em;
}
.message-assistant pre {
    background: #1E293B;
    color: #E2E8F0;
    padding: 12px;
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin: 8px 0;
    font-size: 0.85rem;
    line-height: 1.5;
}
.message-assistant pre code {
    background: none;
    padding: 0;
    color: inherit;
}
.message-assistant h1, .message-assistant h2, .message-assistant h3 {
    font-size: 1rem;
    font-weight: 700;
    margin: 8px 0 4px;
}
.message-assistant blockquote {
    border-left: 3px solid var(--color-blue-start);
    padding-left: 12px;
    color: var(--color-text-muted);
    margin: 8px 0;
}
.message-assistant strong { font-weight: 700; }
.message-assistant em { font-style: italic; }
.message-assistant a { color: var(--color-blue-start); text-decoration: underline; }

/* Typing indicator */
.typing-indicator {
    display: none;
    align-self: flex-start;
    padding: 10px 14px;
    background: var(--color-assistant-bubble);
    border-radius: var(--radius-md);
    border-bottom-left-radius: 4px;
}

.typing-indicator.visible {
    display: flex;
    gap: 4px;
    align-items: center;
}

.typing-dot {
    width: 7px;
    height: 7px;
    background: var(--color-text-muted);
    border-radius: 50%;
    animation: typing-bounce 1.2s infinite;
}

.typing-dot:nth-child(2) { animation-delay: 0.15s; }
.typing-dot:nth-child(3) { animation-delay: 0.3s; }

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

/* ---- Input bar ---- */

.chat-input-wrapper {
    position: sticky;
    bottom: 0;
    z-index: 20;
    background: rgba(255, 255, 255, 0.55);
    -webkit-backdrop-filter: blur(12px);
    backdrop-filter: blur(12px);
    border-top: 1px solid rgba(229, 231, 235, 0.7);
}

.chat-input-bar {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 10px 16px;
    background: transparent;
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
}

.chat-input-bar textarea {
    flex: 1;
    resize: none;
    max-height: 120px;
    min-height: 42px;
    padding: 10px 14px;
    font-size: 16px;
    font-family: var(--font-stack);
    color: var(--color-text);
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color 0.15s;
    line-height: 1.4;
}

.chat-input-bar textarea:focus {
    border-color: var(--color-border-focus);
}

.chat-input-bar .btn-send {
    width: 42px;
    height: 42px;
    padding: 0;
    border-radius: 50%;
    flex-shrink: 0;
    background: linear-gradient(90deg, rgba(15, 70, 180, 1) 0%, rgba(22, 99, 222, 1) 100%);
    box-shadow: 0 2px 8px rgba(22, 99, 222, 0.35);
}

.chat-input-bar .btn-icon {
    width: 42px;
    height: 42px;
    padding: 0;
    border-radius: 50%;
    flex-shrink: 0;
    background: transparent;
    border: 1.5px solid var(--color-border);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s, background 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.chat-input-bar .btn-icon:hover {
    border-color: var(--color-text-muted);
}

.btn-icon.recording {
    border-color: var(--color-error);
    background: rgba(220, 38, 38, 0.08);
    animation: pulse-record 1.5s infinite;
}

@keyframes pulse-record {
    0%, 100% { box-shadow: 0 0 0 0 rgba(220, 38, 38, 0.3); }
    50% { box-shadow: 0 0 0 6px rgba(220, 38, 38, 0); }
}

/* File attachment preview */
.file-preview {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    border-top: 1px solid rgba(229, 231, 235, 0.7);
    background: rgba(243, 244, 246, 0.7);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
}

.file-preview.visible {
    display: flex;
}

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

.file-preview .remove-file {
    cursor: pointer;
    color: var(--color-error);
    font-weight: 600;
    padding: 2px 6px;
}

/* ---- Toast notifications ---- */

.toast {
    position: fixed;
    bottom: 80px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--color-text);
    color: #FFFFFF;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s, transform 0.2s;
    z-index: 100;
    max-width: 90%;
    text-align: center;
}

.toast.visible {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

/* ---- Utility ---- */

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

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 4px;
}
.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}
.chat-messages::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 2px;
}

/* ================================================
   Responsive — Mobile (<768px)
   ================================================ */

@media (max-width: 767px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        transition: transform 0.25s ease;
        box-shadow: none;
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.15);
    }

    .btn-hamburger {
        display: flex;
    }

    .chat-header {
        padding-left: 12px;
    }

    .chat-messages {
        padding: 12px;
        padding-top: calc(var(--header-height) + 12px);
        padding-bottom: 12px;
    }

    .chat-input-bar {
        padding: 8px 12px;
    }

    .message {
        max-width: 90%;
    }
}

/* ================================================
   Responsive — Desktop (≥768px)
   ================================================ */

@media (min-width: 768px) {
    .chat-header {
        left: var(--sidebar-width);
    }

    .sidebar-overlay {
        display: none !important;
    }
}

/* Safe area for iOS notch */
@supports (padding-bottom: env(safe-area-inset-bottom)) {
    .chat-input-wrapper {
        padding-bottom: env(safe-area-inset-bottom);
    }
}