:root {
    --bg-main: #f7f5f0;
    --bg-secondary: #edeae3;
    --bg-input: #ffffff;
    --bg-hover: #e3dfd7;
    --bg-user: #8b6914;
    --border-color: rgba(180, 170, 155, 0.35);
    --text-primary: #1a1a1a;
    --text-secondary: #6b6560;
    --text-tertiary: #a09890;
    --accent: #b8860b;
    --accent-dim: rgba(184, 134, 11, 0.12);
    --accent-gradient: linear-gradient(135deg, #d4a853 0%, #b8860b 100%);
    --gold: #b8860b;
    --gold-dim: rgba(184, 134, 11, 0.12);
    --gold-gradient: linear-gradient(135deg, #d4a853 0%, #b8860b 100%);
    --radius: 24px;
    --radius-sm: 16px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Login Screen
   ============================================ */
.login-screen {
    height: 100vh;
    height: 100dvh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-main);
    padding: 20px;
    padding-bottom: 15vh;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
    z-index: 100;
}

.login-screen::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 30%, rgba(212, 168, 83, 0.12) 0%, transparent 50%),
                radial-gradient(circle at 70% 70%, rgba(212, 168, 83, 0.08) 0%, transparent 50%);
    animation: ambientGlow 15s ease-in-out infinite alternate;
}

@keyframes ambientGlow {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-5%, -5%) rotate(10deg); }
}

.login-container {
    position: relative;
    text-align: center;
    max-width: 440px;
    width: 100%;
    animation: fadeInUp 0.6s ease-out;
}

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

.login-icon {
    font-size: 80px;
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 20px rgba(212, 168, 83, 0.3));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.login-title {
    font-size: clamp(22px, 5.5vw, 38px);
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    letter-spacing: -0.5px;
    background: var(--gold-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    white-space: nowrap;
}

.login-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-field {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-label {
    font-size: 14px;
    color: var(--text-secondary);
    text-align: left;
}

.input-field input {
    width: 100%;
    padding: 16px 20px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 16px;
    color: var(--text-primary);
    font-size: 16px;
    font-family: inherit;
    outline: none;
    transition: var(--transition);
}

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

.input-field input:focus {
    border-color: var(--gold);
    box-shadow: 0 0 0 4px var(--gold-dim);
}

.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    margin-top: 8px;
    padding: 16px 32px;
    background: var(--gold-gradient);
    border: none;
    border-radius: 16px;
    color: #1a1a1a;
    font-size: 16px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: 0.5s;
}

.login-btn:hover:not(:disabled)::before {
    left: 100%;
}

.login-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 168, 83, 0.4);
}

.login-btn:active:not(:disabled) {
    transform: translateY(0);
}

.login-btn:disabled {
    background: var(--bg-hover);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.login-btn:disabled::before {
    display: none;
}

.login-hint {
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-tertiary);
}

.input-hint {
    display: block;
    margin-top: 4px;
    font-size: 12px;
    color: #d93025;
    min-height: 0;
}


/* ============================================
   Header Updates
   ============================================ */
.header {
    position: relative;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--accent-dim);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    color: var(--accent);
}

.user-badge::before {
    content: '';
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
}

.logout-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    margin-left: 8px;
}

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

.header-right {
    display: flex;
    align-items: center;
}

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

html, body {
    height: 100%;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -webkit-text-size-adjust: 100%;
    touch-action: manipulation;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100%;
    max-width: 100%;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

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

.header-right {
    display: flex;
    align-items: center;
}

.icon-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

.icon-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.new-chat-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

.new-chat-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.model-name {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--accent-dim);
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
    color: var(--accent);
}

.status-dot {
    width: 6px;
    height: 6px;
    background: var(--accent);
    border-radius: 50%;
}

/* Main Area */
.main-area {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Welcome Screen */
.welcome-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 16px;
    gap: 16px;
    overflow: hidden;
}

.welcome-content {
    text-align: center;
    max-width: 768px;
    width: 100%;
}

.welcome-content h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.5;
}

.welcome-input-slot {
    width: 100%;
    max-width: 600px;
}

.input-area.welcome-position {
    padding: 0;
    background: transparent;
}

.input-area.welcome-position .input-wrapper {
    max-width: 100%;
}

.suggestions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 600px;
    width: 100%;
}

.suggestion-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 14px;
    text-align: left;
    cursor: pointer;
    transition: var(--transition);
    -webkit-tap-highlight-color: transparent;
    outline: none;
}

.suggestion-btn:hover {
    background: var(--accent-dim);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(184, 134, 11, 0.15);
}

.suggestion-icon {
    font-size: 20px;
    flex-shrink: 0;
}

/* Chat Area */
.chat-area {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.chat-container {
    flex: 1;
    max-width: 768px;
    width: 100%;
    margin: 0 auto;
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

/* Messages */
.message {
    display: flex;
    gap: 16px;
    animation: fadeIn 0.3s ease;
}

.message.user {
    justify-content: flex-end;
}

.message.user .message-content {
    display: flex;
    justify-content: flex-end;
}

.message.user .message-body {
    flex: none;
    background: var(--accent-gradient);
    color: #ffffff;
    padding: 10px 14px;
    border-radius: 20px 20px 6px 20px;
    max-width: 70%;
    width: fit-content;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
    word-break: break-word;
}

.message.user .message-body p {
    color: #ffffff;
}

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

.message-icon {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--accent-gradient);
    color: #ffffff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.12);
}

.message-icon svg {
    width: 16px;
    height: 16px;
}

.message.user .message-icon {
    background: var(--bg-user);
    color: var(--text-primary);
}

.message-content {
    flex: 1;
    min-width: 0;
    max-width: 85%;
}

.agent-name {
    font-size: 12px;
    font-weight: 600;
    color: var(--accent);
    margin-bottom: 4px;
    letter-spacing: 0.3px;
}

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

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

.message.assistant .message-body {
    background: transparent;
    padding: 0;
}

.message-body p {
    margin-bottom: 8px;
    font-size: 15px;
    line-height: 1.5;
    color: var(--text-primary);
}

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

/* Typing Indicator */
.message-body:has(.typing-indicator) {
    background: transparent !important;
    box-shadow: none !important;
    padding: 4px 0 !important;
}

.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 0;
}

.typing-indicator span {
    width: 8px;
    height: 8px;
    background: var(--accent);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out;
    opacity: 0.6;
}

.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;
    }
}

/* Input Area */
.input-area {
    padding: 16px;
    background: var(--bg-main);
    flex-shrink: 0;
}

.input-wrapper {
    max-width: 768px;
    margin: 0 auto;
}

.input-container {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 12px 12px 12px 20px;
    transition: var(--transition);
}

.input-container:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

#userInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-primary);
    font-size: 16px; /* iOS auto-zoom prevention (must be 16px+) */
    font-family: inherit;
    line-height: 1.5;
    resize: none;
    outline: none;
    max-height: 200px;
    overflow-y: auto;
    touch-action: auto;
}

#userInput::placeholder {
    color: var(--text-tertiary);
}

.send-btn {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-gradient);
    border: none;
    border-radius: 50%;
    color: #ffffff;
    cursor: pointer;
    transition: var(--transition);
    flex-shrink: 0;
    box-shadow: 0 2px 8px rgba(184, 134, 11, 0.25);
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(184, 134, 11, 0.3);
}

.send-btn:disabled {
    background: var(--bg-hover);
    color: var(--text-tertiary);
    cursor: not-allowed;
}

.disclaimer {
    text-align: center;
    font-size: 12px;
    color: var(--text-tertiary);
    margin-top: 12px;
}

/* Scrollbar */
.chat-area::-webkit-scrollbar,
.main-area::-webkit-scrollbar,
#userInput::-webkit-scrollbar {
    width: 8px;
}

.chat-area::-webkit-scrollbar-track,
.main-area::-webkit-scrollbar-track,
#userInput::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb,
.main-area::-webkit-scrollbar-thumb,
#userInput::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 4px;
}

.chat-area::-webkit-scrollbar-thumb:hover,
.main-area::-webkit-scrollbar-thumb:hover,
#userInput::-webkit-scrollbar-thumb:hover {
    background: var(--text-tertiary);
}

/* Responsive */
@media (max-width: 640px) {
    .login-icon {
        font-size: 60px;
    }

    .welcome-screen {
        padding: 16px 24px;
        gap: 16px;
    }

    .welcome-content h1 {
        font-size: 22px;
    }

    .suggestions {
        grid-template-columns: 1fr;
        gap: 6px;
    }

    .suggestion-btn {
        padding: 12px 16px;
        font-size: 14px;
    }

    .chat-container {
        padding: 16px 24px;
    }

    .message {
        gap: 10px;
    }

    .message-icon {
        width: 24px;
        height: 24px;
    }

    .message-icon svg {
        width: 14px;
        height: 14px;
    }

    /* Mobile: user message width adjustment */
    .message.user .message-body {
        max-width: 80%;
    }

    /* Mobile: assistant message compact */
    .message.assistant .message-content {
        max-width: 90%;
    }
}

/* iOS Safe Area Support */
@supports (padding: max(0px)) {
    .header {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-top: max(12px, env(safe-area-inset-top));
    }

    .input-area:not(.welcome-position) {
        padding-left: max(16px, env(safe-area-inset-left));
        padding-right: max(16px, env(safe-area-inset-right));
        padding-bottom: max(16px, env(safe-area-inset-bottom));
    }

    .chat-container {
        padding-left: max(24px, env(safe-area-inset-left));
        padding-right: max(24px, env(safe-area-inset-right));
    }

    .welcome-screen {
        padding-left: max(24px, env(safe-area-inset-left));
        padding-right: max(24px, env(safe-area-inset-right));
    }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
    .suggestion-btn:hover {
        background: var(--bg-secondary);
        border-color: var(--border-color);
        transform: none;
        box-shadow: none;
    }

    .suggestion-btn:active {
        background: var(--bg-hover);
        border-color: var(--border-color);
    }

    .suggestion-btn:focus {
        background: var(--bg-secondary);
        border-color: var(--border-color);
    }

    .send-btn:hover:not(:disabled) {
        transform: none;
    }

    .send-btn:active:not(:disabled) {
        transform: scale(0.95);
    }

    .new-chat-btn:hover,
    .icon-btn:hover,
    .logout-btn:hover {
        background: transparent;
        color: var(--text-secondary);
    }

    .new-chat-btn:active,
    .icon-btn:active,
    .logout-btn:active {
        background: var(--bg-hover);
        color: var(--text-primary);
    }

    .history-item-delete {
        opacity: 1;
    }
}

/* ============================================
   History Sidebar
   ============================================ */

.history-backdrop {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: 50;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.history-backdrop.open {
    display: block;
    opacity: 1;
}

.history-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 300px;
    background: var(--bg-main);
    border-right: 1px solid var(--border-color);
    z-index: 60;
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.history-sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    flex-shrink: 0;
}

.history-sidebar-header h2 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.history-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 0;
}

.history-list::-webkit-scrollbar {
    width: 6px;
}

.history-list::-webkit-scrollbar-track {
    background: transparent;
}

.history-list::-webkit-scrollbar-thumb {
    background: var(--bg-hover);
    border-radius: 3px;
}

.history-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

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

.history-item.active {
    background: var(--accent-dim);
    border-left: 3px solid var(--accent);
    padding-left: 13px;
}

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

.history-item-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.history-item-date {
    font-size: 11px;
    color: var(--text-tertiary);
    margin-top: 2px;
}

.history-item-delete {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-tertiary);
    cursor: pointer;
    transition: var(--transition);
    opacity: 0;
    flex-shrink: 0;
}

.history-item:hover .history-item-delete {
    opacity: 1;
}

.history-item-delete:hover {
    background: rgba(217, 48, 37, 0.1);
    color: #d93025;
}

.history-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
    gap: 12px;
    color: var(--text-tertiary);
}

.history-empty p {
    font-size: 14px;
}

.history-sidebar-footer {
    padding: 12px 16px;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.history-clear-all-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    width: 100%;
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 13px;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.history-clear-all-btn:hover {
    background: rgba(217, 48, 37, 0.08);
    border-color: rgba(217, 48, 37, 0.3);
    color: #d93025;
}

/* Session boundary in chat */
.session-boundary {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 0;
    color: var(--text-tertiary);
    font-size: 12px;
}

.session-boundary::before,
.session-boundary::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border-color);
}

.session-boundary-text {
    white-space: nowrap;
    flex-shrink: 0;
}

/* Mobile sidebar */
@media (max-width: 640px) {
    .history-sidebar {
        width: 100%;
    }

    .history-item-delete {
        opacity: 1;
    }
}

/* iOS Safe Area for sidebar */
@supports (padding: max(0px)) {
    .history-sidebar-header {
        padding-top: max(16px, env(safe-area-inset-top));
        padding-left: max(16px, env(safe-area-inset-left));
    }

    .history-sidebar-footer {
        padding-bottom: max(12px, env(safe-area-inset-bottom));
        padding-left: max(16px, env(safe-area-inset-left));
    }

    .history-list {
        padding-left: max(0px, env(safe-area-inset-left));
    }
}