/* ===== DESIGN TOKENS ===== */
:root {
    /* Colors */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a28;
    --bg-glass: rgba(255, 255, 255, 0.03);
    --bg-glass-hover: rgba(255, 255, 255, 0.06);

    --text-primary: #e8e8f0;
    --text-secondary: #8888a0;
    --text-muted: #555570;

    --accent-primary: #6C5CE7;
    --accent-secondary: #00D2FF;
    --accent-gradient: linear-gradient(135deg, #6C5CE7 0%, #00D2FF 100%);
    --accent-gradient-hover: linear-gradient(135deg, #7d6ff0 0%, #33ddff 100%);

    --border-color: rgba(255, 255, 255, 0.06);
    --border-hover: rgba(255, 255, 255, 0.12);

    --success: #00E676;
    --warning: #FFD740;
    --error: #FF5252;

    /* Sizes */
    --sidebar-width: 280px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;

    /* Typography */
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(108, 92, 231, 0.3);
}

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

body {
    font-family: var(--font-main);
    background: var(--bg-primary);
    color: var(--text-primary);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

/* ===== APP LAYOUT ===== */
.app {
    display: flex;
    height: 100vh;
}

/* ===== SIDEBAR ===== */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    padding: 20px 16px;
    flex-shrink: 0;
}

.sidebar-header {
    margin-bottom: 24px;
}

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

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse-glow 3s ease-in-out infinite alternate;
}

@keyframes pulse-glow {
    0% { filter: drop-shadow(0 0 4px rgba(108, 92, 231, 0.4)); }
    100% { filter: drop-shadow(0 0 12px rgba(0, 210, 255, 0.6)); }
}

.logo-text {
    font-size: 20px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.sidebar-section {
    margin-bottom: 16px;
}

.section-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.provider-select-wrapper {
    position: relative;
}

.provider-select {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 13px;
    cursor: pointer;
    outline: none;
    appearance: none;
    transition: all 0.2s ease;
}

.provider-select:hover {
    border-color: var(--border-hover);
    background: var(--bg-glass-hover);
}

.provider-select:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.15);
}

.provider-select option {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-main);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.btn-new-chat {
    width: 100%;
    background: var(--accent-gradient);
    color: white;
    box-shadow: var(--shadow-glow);
}

.btn-new-chat:hover {
    background: var(--accent-gradient-hover);
    transform: translateY(-1px);
    box-shadow: 0 0 28px rgba(108, 92, 231, 0.4);
}

.btn-new-chat:active {
    transform: translateY(0);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--success);
    box-shadow: 0 0 8px rgba(0, 230, 118, 0.5);
    animation: status-pulse 2s ease-in-out infinite;
}

@keyframes status-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.status-indicator.busy .status-dot {
    background: var(--warning);
    box-shadow: 0 0 8px rgba(255, 215, 64, 0.5);
}

.status-indicator.error .status-dot {
    background: var(--error);
    box-shadow: 0 0 8px rgba(255, 82, 82, 0.5);
    animation: none;
}

/* ===== MAIN CONTENT ===== */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
}

.chat-container::-webkit-scrollbar {
    width: 6px;
}

.chat-container::-webkit-scrollbar-track {
    background: transparent;
}

.chat-container::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 3px;
}

/* ===== WELCOME SCREEN ===== */
.welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    text-align: center;
    animation: fade-in 0.6s ease;
}

@keyframes fade-in {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.welcome-icon {
    margin-bottom: 24px;
    animation: float 4s ease-in-out infinite;
}

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

.welcome-title {
    font-size: 36px;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

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

.welcome-features {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    justify-content: center;
}

.feature-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: var(--bg-glass);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    color: var(--text-secondary);
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
}

.feature-card:hover {
    background: var(--bg-glass-hover);
    border-color: var(--accent-primary);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.feature-icon {
    font-size: 20px;
}

/* ===== MESSAGES ===== */
.messages {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    display: flex;
    gap: 12px;
    animation: message-in 0.3s ease;
    max-width: 860px;
}

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

.message.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    flex-shrink: 0;
}

.message.user .message-avatar {
    background: var(--accent-gradient);
}

.message.assistant .message-avatar {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
}

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

.message-content {
    padding: 14px 18px;
    border-radius: var(--radius-lg);
    font-size: 14px;
    line-height: 1.65;
    word-wrap: break-word;
}

.message.user .message-content {
    background: var(--accent-gradient);
    color: white;
    border-bottom-right-radius: 4px;
}

.message.assistant .message-content {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-bottom-left-radius: 4px;
}

.message-content pre {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 14px;
    margin: 10px 0;
    overflow-x: auto;
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
}

.message-content code {
    font-family: var(--font-mono);
    font-size: 13px;
    background: rgba(108, 92, 231, 0.15);
    padding: 2px 6px;
    border-radius: 4px;
}

.message-content pre code {
    background: none;
    padding: 0;
}

/* Tool calls */
.tool-call {
    margin: 8px 0;
    padding: 12px 16px;
    background: rgba(108, 92, 231, 0.08);
    border: 1px solid rgba(108, 92, 231, 0.2);
    border-radius: var(--radius-sm);
    font-size: 12px;
    animation: tool-pulse 0.5s ease;
}

@keyframes tool-pulse {
    0% { border-color: rgba(108, 92, 231, 0.5); box-shadow: 0 0 12px rgba(108, 92, 231, 0.2); }
    100% { border-color: rgba(108, 92, 231, 0.2); box-shadow: none; }
}

.tool-call-header {
    display: flex;
    align-items: center;
    gap: 6px;
    font-weight: 600;
    color: var(--accent-primary);
    margin-bottom: 6px;
}

.tool-call-args {
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-all;
}

.tool-result {
    margin: 8px 0;
    padding: 12px 16px;
    background: rgba(0, 230, 118, 0.05);
    border: 1px solid rgba(0, 230, 118, 0.15);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-secondary);
    white-space: pre-wrap;
    word-break: break-all;
    max-height: 200px;
    overflow-y: auto;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 5px;
    padding: 8px 0;
}

.typing-indicator span {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--accent-primary);
    animation: blink 1.2s ease-in-out infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes blink {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1); }
}

/* ===== INPUT AREA ===== */
.input-area {
    padding: 16px 24px 20px;
    border-top: 1px solid var(--border-color);
    background: var(--bg-secondary);
}

.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 10px;
    padding: 6px 6px 6px 18px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
}

.input-wrapper:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(108, 92, 231, 0.1);
}

.message-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 14px;
    line-height: 1.5;
    padding: 10px 0;
    resize: none;
    max-height: 150px;
}

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

.btn-send {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--accent-gradient);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.btn-send:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-glow);
}

.btn-send:active {
    transform: scale(0.95);
}

.btn-send:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
}

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

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        z-index: 100;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.open {
        left: 0;
    }

    .welcome-features {
        flex-direction: column;
    }
}