:root {
    --bg-color: #000000;
    --text-color: #e7e9ea;
    --secondary-text: #71767b;
    --border-color: #2f3336;
    --input-bg: #16181c;
    --hover-bg: #1d1f23;
    --accent: #1d9bf0;
}

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

html, body {
    width: 100%;
    height: 100%;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    font-size: 15px;
    line-height: 1.5;
    overflow: hidden;
}

/* ==================== NAVIGATION ==================== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 16px;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 100;
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    transition: background 0.2s;
}

.logo-container:hover {
    background: var(--hover-bg);
}

.grok-logo {
    width: 24px;
    height: 24px;
    stroke: currentColor;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    background: transparent;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 20px;
    font-size: 14px;
    transition: background 0.2s;
}

.nav-btn:hover {
    background: var(--hover-bg);
}

.nav-btn i {
    width: 18px;
    height: 18px;
}

.btn-signin {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-signin:hover {
    background: var(--hover-bg);
    border-color: var(--text-color);
}

.btn-signup {
    background: var(--text-color);
    color: var(--bg-color);
    border: none;
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    transition: all 0.2s;
}

.btn-signup:hover {
    background: #d7dadc;
}

/* ==================== CONTAINER ==================== */
.container {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* ==================== HOME VIEW ==================== */
.home-view {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    flex: 1;
    padding: 20px;
    overflow-y: auto;
}

.hero-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 40px;
}

.hero-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    margin-bottom: 40px;
}

.hero-logo svg {
    width: 120px;
    height: 120px;
    stroke: var(--text-color);
    opacity: 0.9;
}

.hero-logo h1 {
    font-size: 56px;
    font-weight: 700;
    letter-spacing: -1px;
}

.search-container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.search-box {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    padding: 12px 16px;
    transition: all 0.2s;
}

.search-box:focus-within {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px var(--accent);
}

.input-area {
    display: flex;
    align-items: flex-end;
    gap: 12px;
}

.input-icon {
    background: transparent;
    border: none;
    color: var(--secondary-text);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.input-icon i {
    width: 20px;
    height: 20px;
}

.input-icon:hover {
    color: var(--text-color);
}

#homeInput, #chatInput {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-color);
    font-family: inherit;
    font-size: 15px;
    resize: none;
    outline: none;
    max-height: 200px;
    line-height: 1.5;
}

#homeInput::placeholder, #chatInput::placeholder {
    color: var(--secondary-text);
}

.input-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.mode-selector {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--secondary-text);
    font-size: 13px;
    padding: 4px 8px;
    border-radius: 12px;
    cursor: pointer;
    transition: background 0.2s;
}

.mode-selector:hover {
    background: var(--hover-bg);
}

.mode-selector i {
    width: 16px;
    height: 16px;
}

.control-btn {
    background: transparent;
    border: none;
    color: var(--secondary-text);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.2s;
}

.control-btn i {
    width: 20px;
    height: 20px;
}

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

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

.send-btn:hover {
    background: #d7dadc;
}

.search-hint {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    color: var(--secondary-text);
    font-size: 13px;
}

.search-hint i {
    width: 16px;
    height: 16px;
}

/* ==================== CHAT VIEW ==================== */
.chat-view {
    display: flex;
    flex-direction: column;
    flex: 1;
    overflow: hidden;
}

.messages-list {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.messages-list::-webkit-scrollbar {
    width: 8px;
}

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

.messages-list::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.messages-list::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-text);
}

/* ==================== MESSAGES ==================== */
.msg-wrapper {
    display: flex;
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.msg {
    max-width: 80%;
    padding: 12px 16px;
    border-radius: 18px;
    word-wrap: break-word;
    line-height: 1.5;
}

.msg.user {
    background: var(--accent);
    color: white;
    align-self: flex-end;
    border-radius: 18px;
}

.msg.ai {
    background: transparent;
    color: var(--text-color);
    align-self: flex-start;
    border-left: 2px solid var(--border-color);
    padding-left: 16px;
    border-radius: 0;
}

/* ==================== THINKING ==================== */
.thinking-container {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    width: fit-content;
    border: 1px solid var(--border-color);
}

.loader-dots {
    display: flex;
    gap: 4px;
}

.loader-dots span {
    width: 6px;
    height: 6px;
    background: var(--text-color);
    border-radius: 50%;
    animation: pulse 1.4s infinite;
}

.loader-dots span:nth-child(1) {
    animation-delay: 0s;
}

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

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

@keyframes pulse {
    0%, 60%, 100% {
        opacity: 0.3;
    }
    30% {
        opacity: 1;
    }
}

.thinking-text {
    font-size: 14px;
    color: var(--text-color);
}

/* ==================== CODE BLOCKS ==================== */
.code-box {
    background: #16181c;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    margin: 8px 0;
}

.code-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
}

.code-lang {
    font-size: 12px;
    color: var(--secondary-text);
    font-family: 'Monaco', 'Courier New', monospace;
}

.copy-btn {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--secondary-text);
    padding: 4px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    transition: all 0.2s;
}

.copy-btn:hover {
    background: var(--hover-bg);
    color: var(--text-color);
    border-color: var(--text-color);
}

pre {
    padding: 16px;
    overflow-x: auto;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 13px;
    line-height: 1.6;
}

code {
    color: var(--text-color);
}

.cmt { color: #71767b; }
.str { color: #71d5ff; }
.num { color: #ffd700; }
.kw { color: #ff6b6b; font-weight: 600; }
.fn { color: #69c0ff; }

/* ==================== CHAT INPUT ==================== */
.chat-input-container {
    padding: 16px 20px 20px;
    background: var(--bg-color);
    border-top: 1px solid var(--border-color);
    max-width: 100%;
}

.chat-input-container .search-box {
    max-width: 600px;
    margin: 0 auto;
}

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

/* ==================== RESPONSIVE ==================== */
@media (max-width: 640px) {
    .top-nav {
        padding: 0 12px;
    }

    .nav-btn span {
        display: none;
    }

    .btn-signin {
        display: none;
    }

    .hero-logo h1 {
        font-size: 40px;
    }

    .search-container {
        max-width: 100%;
    }

    .msg {
        max-width: 90%;
    }

    .search-hint {
        font-size: 12px;
    }
}