:root {
    --bg-dark: #07080c;
    --sidebar-bg: rgba(13, 15, 23, 0.85);
    --card-bg: rgba(18, 21, 32, 0.75);
    --border-color: rgba(255, 255, 255, 0.08);
    --accent-red: #ef4444;
    --accent-orange: #f97316;
    --accent-pink: #ec4899;
    --accent-blue: #38bdf8;
    --accent-purple: #c084fc;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --font-heading: 'Outfit', sans-serif;
    --font-sans: 'Plus Jakarta Sans', sans-serif;
    --font-mono: 'Fira Code', monospace;
}

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

body {
    background-color: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(239, 68, 68, 0.1) 0%, transparent 35%),
        radial-gradient(circle at 90% 80%, rgba(56, 189, 248, 0.1) 0%, transparent 35%);
    color: var(--text-main);
    font-family: var(--font-sans);
    height: 100vh;
    overflow: hidden;
}

.chat-app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
}

/* Top Navigation Bar */
.top-nav-bar {
    height: 58px;
    background: rgba(13, 15, 23, 0.75);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 24px;
    flex-shrink: 0;
    z-index: 10;
}

.nav-left {
    display: flex;
    align-items: center;
    gap: 20px;
}

.brand-link {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-text {
    font-family: var(--font-heading);
    font-size: 17px;
    font-weight: 800;
    background: linear-gradient(135deg, #ffffff 0%, #cbd5e1 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 14px;
}

.btn-download-exe {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    text-decoration: none;
    padding: 7px 14px;
    border-radius: 18px;
    font-size: 12px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: all 0.2s ease;
}

.btn-download-exe:hover {
    background: rgba(255, 255, 255, 0.12);
}

.btn-auth-primary {
    background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
    color: #0f172a;
    border: none;
    padding: 8px 18px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 800;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.15);
    transition: all 0.2s ease;
}

.btn-auth-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(255, 255, 255, 0.3);
}

/* Main Body Grid Layout */
.chat-main-grid {
    flex: 1;
    display: flex;
    flex-direction: row;
    overflow: hidden;
    height: calc(100vh - 58px);
}

/* Left Sidebar Fixed Width (280px) */
.chat-sidebar {
    width: 280px;
    min-width: 280px;
    max-width: 280px;
    background: var(--sidebar-bg);
    backdrop-filter: blur(20px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 18px;
    gap: 16px;
    height: 100%;
    flex-shrink: 0;
}

.prominent-model-block {
    background: linear-gradient(135deg, rgba(26, 30, 43, 0.9), rgba(15, 18, 28, 0.9));
    border: 1px solid rgba(56, 189, 248, 0.4);
    padding: 14px;
    border-radius: 12px;
    box-shadow: 0 6px 20px rgba(56, 189, 248, 0.15);
}

.block-label-highlight {
    font-family: var(--font-heading);
    font-size: 10px;
    font-weight: 900;
    color: var(--accent-blue);
    letter-spacing: 1.8px;
}

.dynamic-model-select {
    width: 100%;
    background-color: #090a0f;
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: #ffffff;
    padding: 10px;
    border-radius: 8px;
    font-size: 12px;
    font-weight: 700;
    outline: none;
    cursor: pointer;
    margin-top: 6px;
}

.dynamic-model-select option {
    background-color: #121520;
    color: #ffffff;
    padding: 10px;
    font-size: 13px;
}

.btn-new-chat {
    width: 100%;
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.15), rgba(249, 115, 22, 0.15));
    color: var(--text-main);
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 11px;
    border-radius: 10px;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 13px;
    letter-spacing: 0.5px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s ease;
}

.btn-new-chat:hover {
    background: linear-gradient(135deg, rgba(239, 68, 68, 0.3), rgba(249, 115, 22, 0.3));
    border-color: rgba(239, 68, 68, 0.6);
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.2);
}

.sidebar-block {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.flex-1 {
    flex: 1;
    overflow: hidden;
}

.block-label {
    font-family: var(--font-heading);
    font-size: 10px;
    font-weight: 800;
    color: var(--text-muted);
    letter-spacing: 1.5px;
}

.sessions-empty {
    background: rgba(18, 21, 32, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 24px 12px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.sessions-empty strong {
    font-size: 13px;
    color: var(--text-main);
}

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

.sessions-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.session-item {
    padding: 10px 12px;
    background: rgba(18, 21, 32, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 12px;
    color: var(--text-main);
    cursor: pointer;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    transition: all 0.2s ease;
}

.session-item:hover {
    border-color: rgba(255, 255, 255, 0.2);
    background: rgba(26, 30, 45, 0.9);
}

/* Right Workspace */
.chat-workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    position: relative;
    background: transparent;
    height: 100%;
}

.chat-stream-container {
    flex: 1;
    overflow-y: auto;
    padding: 30px 50px 130px 50px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.welcome-agent-card {
    background: rgba(18, 21, 32, 0.7);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
}

.welcome-agent-card h2 {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 8px;
    background: linear-gradient(135deg, #ffffff 0%, #38bdf8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.welcome-agent-card p {
    font-size: 14px;
    color: var(--text-muted);
}

.chat-history {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message-bubble {
    padding: 16px 20px;
    border-radius: 14px;
    max-width: 85%;
    font-size: 14px;
    line-height: 1.6;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.message-bubble.user {
    align-self: flex-end;
    background: linear-gradient(135deg, #0284c7 0%, #38bdf8 100%);
    color: white;
}

.message-bubble.assistant {
    align-self: flex-start;
    background: rgba(18, 21, 32, 0.85);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    color: var(--text-main);
}

.message-bubble pre {
    background: #090a0f;
    padding: 14px;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 12px;
    overflow-x: auto;
    margin-top: 10px;
    border: 1px solid var(--border-color);
}

/* Collapsible Reasoning Box */
.reasoning-box {
    background: rgba(30, 27, 75, 0.6);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(192, 132, 252, 0.3);
    border-radius: 12px;
    overflow: hidden;
}

.reasoning-header {
    padding: 12px 16px;
    font-family: var(--font-heading);
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-purple);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.reasoning-content {
    padding: 14px 16px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: #e9d5ff;
    max-height: 200px;
    overflow-y: auto;
    border-top: 1px solid rgba(192, 132, 252, 0.2);
    white-space: pre-wrap;
}

/* Floating Prompt Bar */
.prompt-floating-container {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 780px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.file-tags-container {
    display: flex;
    gap: 6px;
    flex-wrap: wrap;
}

.file-tag-pill {
    background: rgba(30, 35, 48, 0.9);
    border: 1px solid var(--border-color);
    color: var(--accent-blue);
    padding: 5px 12px;
    border-radius: 16px;
    font-size: 11px;
    font-family: var(--font-mono);
    display: flex;
    align-items: center;
    gap: 6px;
}

.file-tag-remove {
    cursor: pointer;
    color: var(--accent-red);
    font-weight: 800;
}

.prompt-bar-card {
    background: rgba(18, 21, 32, 0.92);
    backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 30px;
    padding: 8px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.prompt-bar-card:focus-within {
    border-color: rgba(56, 189, 248, 0.5);
    box-shadow: 0 12px 40px rgba(56, 189, 248, 0.2);
}

.btn-attach-file {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid var(--border-color);
    color: var(--accent-blue);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.2s ease;
}

.btn-attach-file:hover {
    background: rgba(56, 189, 248, 0.2);
    transform: rotate(90deg);
}

.prompt-bar-card input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-main);
    font-family: var(--font-sans);
    font-size: 14px;
}

.btn-send-prompt {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    border: none;
    color: white;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 15px rgba(239, 68, 68, 0.35);
    transition: all 0.2s ease;
}

.btn-send-prompt:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 20px rgba(239, 68, 68, 0.5);
}

.prompt-warning {
    font-size: 12px;
    color: var(--accent-red);
    font-weight: 600;
    text-align: center;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(7, 8, 12, 0.85);
    backdrop-filter: blur(12px);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 999;
}

.modal-card {
    background: rgba(18, 21, 32, 0.95);
    backdrop-filter: blur(24px);
    border: 1px solid var(--border-color);
    width: 390px;
    border-radius: 16px;
    padding: 28px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.modal-header h2 {
    font-family: var(--font-heading);
    font-size: 20px;
    font-weight: 800;
    color: var(--text-main);
}

.close-modal-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.google-auth-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    background-color: #ffffff;
    color: #0f172a;
    border: none;
    padding: 12px;
    border-radius: 10px;
    font-weight: 700;
    font-size: 14px;
    cursor: pointer;
}

.divider {
    text-align: center;
    margin: 18px 0;
    border-bottom: 1px solid var(--border-color);
    line-height: 0.1em;
}

.divider span {
    background-color: #12141c;
    padding: 0 10px;
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 700;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 14px;
}

.form-group label {
    font-size: 12px;
    color: var(--text-muted);
    font-weight: 600;
}

.form-group input {
    background-color: #090a0f;
    border: 1px solid var(--border-color);
    color: white;
    padding: 10px 14px;
    border-radius: 8px;
    outline: none;
}

.submit-auth-btn {
    width: 100%;
    background: linear-gradient(135deg, #ef4444 0%, #f97316 100%);
    color: white;
    border: none;
    padding: 12px;
    border-radius: 8px;
    font-weight: 800;
    cursor: pointer;
    margin-top: 8px;
}

.toggle-auth-mode {
    text-align: center;
    margin-top: 16px;
    font-size: 12px;
    color: var(--text-muted);
}

.link-btn {
    background: none;
    border: none;
    color: var(--accent-blue);
    font-weight: 700;
    cursor: pointer;
    margin-left: 4px;
}

.auth-error {
    color: var(--accent-red);
    font-size: 12px;
    background: rgba(239, 68, 68, 0.1);
    padding: 8px;
    border-radius: 4px;
    margin-bottom: 8px;
}

.hidden {
    display: none !important;
}