/* ========================================
   SVIP AI Chat — Claude Code Style
   Deep black + warm orange accent
   Centered chat layout
   ======================================== */

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

/* ==================== Design Tokens ==================== */
:root {
    /* Core palette — Claude Code deep dark */
    --bg-primary: #0A0A0A;
    --bg-secondary: #111111;
    --bg-tertiary: #0D0D0D;
    --bg-surface: #161616;
    --bg-surface-hover: #1C1C1C;
    --bg-elevated: #1F1F1F;
    --bg-input: #1A1A1A;
    /* Brand accent — Anthropic warm orange */
    --accent: #5ca361;
    --accent-hover: #aff5b4;
    --accent-muted: rgba(224, 122, 79, 0.12);
    --accent-glow: rgba(224, 122, 79, 0.25);
    --accent-subtle: rgba(224, 122, 79, 0.06);
    /* Text scale */
    --text-primary: #EDEDED;
    --text-secondary: #8B8B8B;
    --text-muted: #5A5A5A;
    --text-inverse: #0A0A0A;
    /* Functional */
    --success: #4ADE80;
    --error: #F87171;
    --warning: #FBBF24;
    /* Borders */
    --border: rgba(255, 255, 255, 0.06);
    --border-active: rgba(255, 255, 255, 0.10);
    --divider: rgba(255, 255, 255, 0.04);
    /* Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.7);
    /* Typography */
    --font-sans: 'Microsoft YaHei', '微软雅黑', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    /* Layout */
    --chat-max-width: 768px;
    --sidebar-width: 280px;
    --top-bar-height: 52px;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow: hidden;
    height: 100vh;
}

::selection {
    background: var(--accent-muted);
    color: var(--accent);
}

/* User message bubble: override selection to avoid orange-on-orange */
.message.user .message-bubble::selection {
    background: rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
}

.message.user .message-bubble *::selection {
    background: rgba(255, 255, 255, 0.25);
    color: #FFFFFF;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.08);
    border-radius: 3px;
}

    ::-webkit-scrollbar-thumb:hover {
        background: rgba(255, 255, 255, 0.14);
    }

/* ==================== App Layout — Centered Chat ==================== */
.app-layout {
    display: flex;
    height: 100vh;
    position: relative;
}

/* ==================== Sidebar ==================== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    transition: transform var(--transition-normal);
    z-index: 100;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-brand-icon {
    width: 32px;
    height: 32px;
    background: var(--accent);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 15px;
    color: var(--text-inverse);
}

.sidebar-brand-name {
    font-weight: 600;
    font-size: 15px;
    color: var(--text-primary);
}

.btn-new-chat {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 9px 14px;
    background: transparent;
    border: 1px dashed var(--border-active);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

    .btn-new-chat:hover {
        border-color: var(--accent);
        color: var(--accent);
        background: var(--accent-subtle);
    }

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

.sidebar-list-section {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sidebar-list-title {
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 8px 10px 4px;
}

.sidebar-item {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
}

    .sidebar-item:hover {
        background: var(--bg-surface-hover);
        color: var(--text-primary);
    }

    .sidebar-item.active {
        background: var(--bg-elevated);
        color: var(--text-primary);
    }

.sidebar-item--empty {
    color: var(--text-muted);
    font-style: italic;
    cursor: default;
    padding-left: 32px;
}

    .sidebar-item--empty:hover {
        background: transparent;
        color: var(--text-muted);
    }

.sidebar-item-icon {
    font-size: 14px;
    flex-shrink: 0;
}

.sidebar-item-title {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-item-delete {
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    line-height: 1;
}

.sidebar-item:hover .sidebar-item-delete {
    display: flex;
}

.sidebar-item-delete:hover {
    background: rgba(248, 113, 113, 0.15);
    color: var(--error);
}

/* ==================== Main Area — Centered ==================== */
.main-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 0;
    position: relative;
    background: var(--bg-primary);
}

/* ==================== Top Bar ==================== */
.top-bar {
    height: var(--top-bar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
    flex-shrink: 0;
    z-index: 10;
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-toggle-sidebar {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 20px;
    cursor: pointer;
    padding: 4px;
}

.top-bar-title {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
}

.user-account {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
    /*  max-width: 120px;*/
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.user-badge {
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

    .user-badge.free {
        background: rgba(255, 255, 255, 0.05);
        color: var(--text-muted);
        border: 1px solid var(--border);
    }

    .user-badge.pro {
        background: linear-gradient(135deg, rgba(224, 122, 79, 0.2), rgba(255, 183, 77, 0.15));
        color: #FFB74D;
        border: 1px solid rgba(255, 183, 77, 0.3);
        text-shadow: 0 0 8px rgba(255, 183, 77, 0.3);
    }

.svip-days {
    font-size: 11px;
    font-weight: 600;
    color: #FFB74D;
    background: rgba(255, 183, 77, 0.1);
    border: 1px solid rgba(255, 183, 77, 0.2);
    padding: 2px 8px;
    border-radius: 12px;
    font-family: var(--font-mono);
    white-space: nowrap;
}

.btn-upgrade {
    padding: 5px 14px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

    .btn-upgrade:hover {
        background: var(--accent-hover);
        box-shadow: 0 0 12px var(--accent-glow);
    }

.btn-login-top {
    padding: 5px 16px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
}

    .btn-login-top:hover {
        background: var(--accent-hover);
        box-shadow: 0 0 12px var(--accent-glow);
    }

.btn-logout {
    padding: 5px 12px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

    .btn-logout:hover {
        border-color: var(--error);
        color: var(--error);
        background: rgba(248, 113, 113, 0.08);
    }

/* ==================== Chat Center Wrapper ==================== */
.chat-center-wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding-top: var(--top-bar-height);
    min-height: 0;
    overflow: hidden;
}

/* ==================== Chat Area — Centered ==================== */
.chat-area {
    width: 100%;
    overflow-y: auto;
    flex: 1 1 0;
    min-height: 0;
    position: relative;
}

/* Welcome background — fixed behind chat content, fades out when messages exist */
.chat-empty {
    position: fixed;
    top: var(--top-bar-height);
    left: var(--sidebar-width);
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 0;
    pointer-events: none;
    opacity: 1;
    transition: opacity 0.5s ease;
}

    .chat-empty.is-hidden {
        opacity: 0.3;
    }

.chat-container {
    width: 100%;
    max-width: var(--chat-max-width);
    margin: 0 auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 1;
}

/* Welcome UI elements */
.chat-empty-icon {
    font-size: 48px;
    color: var(--accent);
    margin-bottom: 20px;
    opacity: 0.8;
}

.chat-empty h2 {
    font-size: 80px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.chat-empty p {
    font-size: 30px;
    color: var(--text-muted);
    max-width: 600px;
    line-height: 1.6;
}

/* ==================== Messages ==================== */
.message {
    padding: 8px 0;
    animation: fadeIn 0.3s ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-row {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

/* ---- User message: right-aligned orange bubble ---- */
.message.user .message-row {
    flex-direction: row-reverse;
}

.message.user .message-content {
    align-items: flex-end;
}

.message.user .message-bubble {
    background: linear-gradient(135deg, #2b8127, #28542b);
    color: #FFFFFF;
    border-radius: 18px 18px 4px 18px;
    padding: 10px 16px;
    max-width: 85%;
    box-shadow: 0 2px 8px rgba(224, 122, 79, 0.2);
}

    .message.user .message-bubble code:not(pre code) {
        background: rgba(255, 255, 255, 0.18);
        color: #FFF;
    }

    .message.user .message-bubble strong {
        color: #FFFFFF;
    }

    .message.user .message-bubble a {
        color: #FFD4C0;
    }

        .message.user .message-bubble a:hover {
            color: #FFFFFF;
        }

.message.user .message-avatar {
    /*  background: var(--accent-muted);*/
    color: var(--accent);
}

/* ---- AI message: left-aligned dark bubble ---- */
.message.assistant .message-content {
    align-items: flex-start;
}

.message.assistant .message-bubble {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border-radius: 18px 18px 18px 4px;
    padding: 10px 16px;
    max-width: 90%;
    border: 1px solid var(--border);
}

.message.assistant .message-avatar {
    /*  background: rgba(255, 255, 255, 0.06);*/
    color: var(--text-secondary);
}

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

.message-bubble {
    font-size: 14px;
    line-height: 1.7;
    color: var(--text-primary);
    word-break: break-word;
}

    /* Markdown content in messages */
    .message-bubble p {
        margin-bottom: 12px;
    }

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

    .message-bubble h1, .message-bubble h2, .message-bubble h3,
    .message-bubble h4, .message-bubble h5, .message-bubble h6 {
        margin: 20px 0 8px;
        font-weight: 600;
        color: var(--text-primary);
    }

    .message-bubble h1 {
        font-size: 1.4em;
    }

    .message-bubble h2 {
        font-size: 1.25em;
    }

    .message-bubble h3 {
        font-size: 1.1em;
    }

    .message-bubble ul, .message-bubble ol {
        padding-left: 20px;
        margin-bottom: 12px;
    }

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

    .message-bubble blockquote {
        border-left: 3px solid var(--accent);
        padding: 8px 16px;
        margin: 12px 0;
        color: var(--text-secondary);
        background: var(--accent-subtle);
        border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    }

    .message-bubble a {
        color: var(--accent);
        text-decoration: none;
    }

        .message-bubble a:hover {
            text-decoration: underline;
        }

    .message-bubble strong {
        color: var(--text-primary);
        font-weight: 600;
    }

    /* Horizontal rule (divider) */
    .message-bubble hr {
        border: none;
        height: 1px;
        background: linear-gradient(90deg, transparent, var(--accent) 20%, var(--accent) 80%, transparent);
        opacity: 0.35;
        margin: 16px 0;
    }

    /* Inline code */
    .message-bubble code:not(pre code) {
        background: rgba(255, 255, 255, 0.06);
        padding: 2px 6px;
        border-radius: 4px;
        font-size: 0.88em;
        font-family: var(--font-mono);
        color: var(--accent);
    }

    /* Code blocks */
    .message-bubble pre {
        background: var(--bg-secondary);
        border: 1px solid var(--border);
        border-radius: var(--radius-md);
        margin: 12px 0;
        overflow: hidden;
    }

        .message-bubble pre code {
            display: block;
            padding: 16px;
            font-family: var(--font-mono);
            font-size: 13px;
            line-height: 1.6;
            overflow-x: auto;
        }

    /* Tables */
    .message-bubble table {
        border-collapse: collapse;
        width: 100%;
        margin: 12px 0;
    }

    .message-bubble th, .message-bubble td {
        padding: 8px 12px;
        border: 1px solid var(--border);
        text-align: left;
    }

    .message-bubble th {
        background: var(--bg-surface);
        font-weight: 600;
    }

/* Typing cursor */
.typing-cursor {
    display: inline-block;
    width: 7px;
    height: 18px;
    background: var(--accent);
    border-radius: 1px;
    animation: blink 0.8s ease-in-out infinite;
    vertical-align: text-bottom;
    margin-left: 2px;
}

@keyframes blink {
    0%, 50% {
        opacity: 1;
    }

    51%, 100% {
        opacity: 0;
    }
}

/* ==================== Input Area — Centered ==================== */
.input-area {
    width: 100%;
    max-width: var(--chat-max-width);
    margin: 0 auto;
    padding: 0 24px 24px;
    flex-shrink: 0;
    position: relative;
    z-index: 5;
}



.input-wrapper {
    width: 100%;
}

.input-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
    text-align: center;
    margin-top: 10px;
}

.chat-input-container {
    position: relative;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: border-color var(--transition-fast);
}

    .chat-input-container:focus-within {
        border-color: var(--accent);
        box-shadow: 0 0 0 1px var(--accent-muted);
    }

.chat-input {
    width: 100%;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 15px;
    font-family: var(--font-sans);
    line-height: 1.6;
    padding: 16px 60px 16px 18px;
    resize: none;
    height: 100px;
    max-height: 200px;
    min-height: 100px;
}

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

.btn-send, .btn-stop {
    position: absolute;
    right: 12px;
    bottom: 12px;
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-send {
    background: var(--accent);
    color: var(--text-inverse);
}

    .btn-send:hover {
        background: var(--accent-hover);
        transform: scale(1.05);
        box-shadow: 0 0 16px var(--accent-glow);
    }

.btn-stop {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-secondary);
}

    .btn-stop:hover {
        background: rgba(255, 255, 255, 0.12);
        color: var(--text-primary);
    }

/* ==================== Auth Modal ==================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    animation: fadeIn 0.2s ease;
}

    .modal-overlay.hidden {
        display: none;
    }

.modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 32px;
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-lg);
    position: relative;
}

/* ==================== Payment Loading Overlay ==================== */
.payment-loading-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    animation: fadeIn 0.2s ease;
}

    .payment-loading-overlay.hidden {
        display: none;
    }

.payment-loading-spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.payment-loading-text {
    margin-top: 16px;
    color: var(--text-primary);
    font-size: 16px;
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 22px;
    cursor: pointer;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

    .modal-close:hover {
        background: rgba(255, 255, 255, 0.06);
        color: var(--text-primary);
    }

.modal-header {
    text-align: center;
    margin-bottom: 24px;
}

    .modal-header h2 {
        font-size: 20px;
        font-weight: 600;
        margin-bottom: 6px;
    }

    .modal-header p {
        font-size: 13px;
        color: var(--text-muted);
    }

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

.form-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-input {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color var(--transition-fast);
}

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

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

.form-error {
    font-size: 12px;
    color: var(--error);
    margin-bottom: 12px;
    min-height: 16px;
    opacity: 0;
    transition: opacity var(--transition-fast);
}

    .form-error.visible {
        opacity: 1;
    }

.btn-submit {
    width: 100%;
    padding: 11px;
    background: var(--accent);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

    .btn-submit:hover {
        background: var(--accent-hover);
    }

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

/* ==================== Modal Tabs ==================== */
.modal-tabs {
    display: flex;
    gap: 0;
    margin-bottom: 24px;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    padding: 3px;
}

.modal-tab {
    flex: 1;
    padding: 8px 0;
    background: transparent;
    border: none;
    border-radius: 5px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font-sans);
    cursor: pointer;
    transition: all var(--transition-fast);
}

    .modal-tab:hover {
        color: var(--text-secondary);
    }

    .modal-tab.active {
        background: var(--bg-elevated);
        color: var(--text-primary);
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
    }

/* ==================== Spinner ==================== */
.btn-submit-spinner {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

/* ==================== Auth Form Transition ==================== */
.auth-form {
    animation: fadeIn 0.2s ease;
}

/* ==================== Upgrade Modal ==================== */
.upgrade-modal {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px 32px 28px;
    width: 100%;
    max-width: 780px;
    box-shadow: var(--shadow-lg), 0 0 80px rgba(255, 183, 77, 0.06);
    position: relative;
    animation: fadeIn 0.25s ease;
}

.upgrade-header {
    text-align: center;
    margin-bottom: 28px;
}

.upgrade-crown {
    font-size: 36px;
    margin-bottom: 8px;
    display: inline-block;
    background: linear-gradient(135deg, #FFB74D, #E07A4F);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 12px rgba(255, 183, 77, 0.3));
}

.upgrade-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.upgrade-header p {
    font-size: 13px;
    color: var(--text-muted);
}

/* Plans grid */
.upgrade-plans {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 16px;
    margin-bottom: 24px;
}

/* Plan card */
.plan-card {
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px 16px 16px;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: all var(--transition-normal);
    min-width: 0;
}

    .plan-card:hover {
        border-color: rgba(255, 255, 255, 0.1);
        transform: translateY(-2px);
        box-shadow: var(--shadow-md);
    }

/* Recommended card — golden glow */
.plan-card--recommended {
    border-color: rgba(255, 183, 77, 0.3);
    background: linear-gradient(180deg, rgba(255, 183, 77, 0.04) 0%, var(--bg-primary) 100%);
}

    .plan-card--recommended:hover {
        border-color: rgba(255, 183, 77, 0.5);
        box-shadow: 0 4px 24px rgba(255, 183, 77, 0.1);
    }

/* Badge / Save tag */
.plan-badge {
    position: absolute;
    top: -10px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, #FFB74D, #E07A4F);
    color: var(--text-inverse);
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 3px 14px;
    border-radius: 20px;
    white-space: nowrap;
}

.plan-save {
    position: absolute;
    top: -10px;
    right: 16px;
    background: var(--success);
    color: #052e16;
    font-size: 10px;
    font-weight: 700;
    padding: 3px 10px;
    border-radius: 20px;
    white-space: nowrap;
}

/* Plan info */
.plan-name {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    margin-top: 4px;
}

.plan-price {
    display: flex;
    align-items: baseline;
    gap: 2px;
    margin-bottom: 4px;
}

.plan-currency {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.plan-amount {
    font-size: 36px;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1;
    letter-spacing: -0.02em;
}

.plan-period {
    font-size: 13px;
    color: var(--text-muted);
    margin-left: 2px;
}

.plan-equivalent {
    font-size: 12px;
    color: var(--success);
    font-weight: 500;
    margin-bottom: 16px;
}

/* Features list */
.plan-features {
    list-style: none;
    padding: 0;
    margin: 0 0 20px;
    flex: 1;
}

    .plan-features li {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 12px;
        color: var(--text-secondary);
        padding: 5px 0;
        line-height: 1.4;
    }

        .plan-features li svg {
            flex-shrink: 0;
            color: var(--accent);
        }

.plan-card--recommended .plan-features li svg {
    color: #FFB74D;
}

/* Plan buttons */
.plan-btn {
    width: 100%;
    padding: 10px;
    background: linear-gradient(135deg, #FFB74D, #E07A4F);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

    .plan-btn:hover {
        box-shadow: 0 0 20px rgba(255, 183, 77, 0.3);
        transform: translateY(-1px);
    }

.plan-btn--outline {
    background: transparent;
    border: 1px solid rgba(255, 183, 77, 0.3);
    color: #FFB74D;
}

    .plan-btn--outline:hover {
        background: rgba(255, 183, 77, 0.08);
        border-color: rgba(255, 183, 77, 0.5);
        box-shadow: 0 0 16px rgba(255, 183, 77, 0.1);
    }

/* Lifetime card — accent glow */
.plan-card--lifetime {
    border-color: rgba(224, 122, 79, 0.3);
    background: linear-gradient(180deg, rgba(224, 122, 79, 0.04) 0%, var(--bg-primary) 100%);
}

    .plan-card--lifetime:hover {
        border-color: rgba(224, 122, 79, 0.5);
        box-shadow: 0 4px 24px rgba(224, 122, 79, 0.1);
    }

    .plan-card--lifetime .plan-features li svg {
        color: #E07A4F;
    }

.plan-save--lifetime {
    background: linear-gradient(135deg, #E07A4F, #FFB74D);
    color: #fff;
}

.plan-btn--lifetime {
    background: linear-gradient(135deg, #E07A4F, #FFB74D);
    border: none;
    color: var(--text-inverse);
}

    .plan-btn--lifetime:hover {
        box-shadow: 0 0 20px rgba(224, 122, 79, 0.3);
        transform: translateY(-1px);
    }

/* Agreement checkbox */
.upgrade-agreement {
    /*  margin-bottom: 16px;*/
    padding-top: 35px;
    border-top: 1px solid var(--divider);
    text-align: center;
}

.agreement-label {
    display: inline-flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    position: relative;
}

.agreement-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.agreement-checkmark {
    flex-shrink: 0;
    width: 18px;
    height: 18px;
    border: 1.5px solid var(--border-active);
    border-radius: 4px;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    margin-top: 1px;
}

    .agreement-checkmark::after {
        content: '';
        display: none;
        width: 10px;
        height: 6px;
        border-left: 2px solid var(--text-inverse);
        border-bottom: 2px solid var(--text-inverse);
        transform: rotate(-45deg) translateY(-1px);
    }

.agreement-checkbox:checked + .agreement-checkmark {
    background: var(--accent);
    border-color: var(--accent);
}

    .agreement-checkbox:checked + .agreement-checkmark::after {
        display: block;
    }

.agreement-checkbox:focus-visible + .agreement-checkmark {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.agreement-text {
    font-size: 12px;
    color: var(--text-muted);
    line-height: 1.5;
}

    .agreement-text a {
        color: var(--accent);
        text-decoration: none;
        font-weight: 500;
        transition: color var(--transition-fast);
    }

        .agreement-text a:hover {
            color: var(--accent-hover);
            text-decoration: underline;
        }

/* Plan buttons — disabled when agreement not checked */
.plan-btn.disabled-agreement {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

.plan-btn--outline.disabled-agreement {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

/* Footer */
.upgrade-footer {
    text-align: center;
    padding-top: 4px;
}

    .upgrade-footer p {
        font-size: 11px;
        color: var(--text-muted);
    }

/* Upgrade modal responsive */
@media (max-width: 780px) {
    .upgrade-plans {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .upgrade-modal {
        max-width: 420px;
    }
}

@media (max-width: 520px) {
    .upgrade-modal {
        max-width: 100%;
        margin: 12px;
        padding: 28px 20px 24px;
    }
}

/* ==================== Utilities ==================== */
.hidden {
    display: none !important;
}

/* ==================== Quota Exceeded Modal ==================== */
.quota-modal {
    text-align: center;
}

.quota-modal-body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.quota-modal-icon {
    font-size: 40px;
    margin-bottom: 16px;
    opacity: 0.9;
}

.quota-modal h2 {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.quota-modal-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 24px;
    max-width: 300px;
}

.quota-modal-actions {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.quota-btn {
    padding: 9px 22px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
    border: none;
}

.quota-btn--primary {
    background: var(--accent);
    color: var(--text-inverse);
}

    .quota-btn--primary:hover {
        background: var(--accent-hover);
        box-shadow: 0 0 16px var(--accent-glow);
    }

.quota-btn--outline {
    background: transparent;
    border: 1px solid rgba(255, 183, 77, 0.3);
    color: #FFB74D;
}

    .quota-btn--outline:hover {
        background: rgba(255, 183, 77, 0.08);
        border-color: rgba(255, 183, 77, 0.5);
    }

/* ==================== Payment Result Modal ==================== */
.payment-result-modal {
    text-align: center;
    max-width: 420px;
    animation: fadeIn 0.3s ease;
}

.payment-result-body {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.payment-result-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
}

.payment-result-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    animation: scaleIn 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

@keyframes scaleIn {
    from {
        transform: scale(0);
        opacity: 0;
    }

    to {
        transform: scale(1);
        opacity: 1;
    }
}

.payment-result-icon--success {
    background: rgba(74, 222, 128, 0.12);
    color: var(--success);
    box-shadow: 0 0 30px rgba(74, 222, 128, 0.15);
}

.payment-result-icon--pending {
    background: rgba(251, 191, 36, 0.12);
    color: var(--warning);
    box-shadow: 0 0 30px rgba(251, 191, 36, 0.12);
}

.payment-result-icon--cancelled {
    background: rgba(248, 113, 113, 0.12);
    color: var(--error);
    box-shadow: 0 0 30px rgba(248, 113, 113, 0.12);
}

.payment-result-modal h2 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.payment-result-desc {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
    margin-bottom: 24px;
    max-width: 320px;
}

/* Detail card */
.payment-result-detail {
    width: 100%;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 16px;
    margin-bottom: 24px;
}

.payment-detail-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 6px 0;
}

    .payment-detail-row + .payment-detail-row {
        border-top: 1px solid var(--divider);
        padding-top: 10px;
        margin-top: 4px;
    }

.payment-detail-label {
    font-size: 13px;
    color: var(--text-muted);
}

.payment-detail-value {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.payment-detail-value--success {
    color: var(--success);
}

/* Buttons */
.payment-result-btn {
    width: 100%;
    padding: 12px;
    background: linear-gradient(135deg, #FFB74D, #E07A4F);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-inverse);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: var(--font-sans);
}

    .payment-result-btn:hover {
        box-shadow: 0 0 20px rgba(255, 183, 77, 0.3);
        transform: translateY(-1px);
    }

.payment-result-btn--outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-secondary);
}

    .payment-result-btn--outline:hover {
        border-color: var(--border-active);
        color: var(--text-primary);
        background: var(--bg-surface-hover);
        box-shadow: none;
        transform: none;
    }

.payment-result-actions {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* ==================== Responsive ==================== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        z-index: 200;
    }

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

    .sidebar-overlay {
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 199;
        display: none;
    }

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

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

    .chat-container {
        padding: 16px 16px 0;
    }

    .input-area {
        padding: 0 16px 16px;
    }

    .chat-empty {
        left: 0;
    }
}

@media (max-width: 480px) {
    :root {
        --chat-max-width: 100%;
    }

    .modal {
        margin: 16px;
    }
}

/* ==================== Site Footer ==================== */
.site-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 12px 20px;
    text-align: right;
    /* background: rgba(0, 0, 0, 0.5); */
    /* border-top: 1px solid var(--border); */
    z-index: 50;
}

.footer-link {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    transition: color var(--transition-fast);
    font-family: var(--font-sans);
}

    .footer-link:hover {
        color: var(--text-secondary);
    }

/* ==================== AI Statement Modal ==================== */
.modal--small {
    max-width: 480px;
}

.ai-statement-content {
    text-align: left;
    color: var(--text-secondary);
    font-size: 13px;
    line-height: 1.7;
}

    .ai-statement-content p {
        margin-bottom: 12px;
    }

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