:root {
    --brand-accent: #F5B455;
    --brand-accent-hover: #E5A445;
    --brand-dark: #1a1a2e;
    --brand-darker: #16162a;
    --brand-surface: #222244;
    --brand-surface-light: #2a2a4e;
    --brand-text: #e8e8f0;
    --brand-text-muted: #9999bb;
    --brand-border: #333366;
    --brand-success: #4caf50;
    --brand-error: #ef5350;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--brand-dark);
    color: var(--brand-text);
    height: 100vh;
    overflow: hidden;
}

/* ─── Login Page ─── */
.login-container {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(135deg, var(--brand-dark), var(--brand-darker));
}

.login-card {
    background: var(--brand-surface);
    border-radius: 16px;
    padding: 48px;
    width: 400px;
    max-width: 90vw;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    text-align: center;
}

.login-card h1 {
    font-size: 24px;
    margin-bottom: 8px;
    color: var(--brand-accent);
}

.login-card p {
    color: var(--brand-text-muted);
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 20px;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--brand-text-muted);
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--brand-border);
    border-radius: 8px;
    background: var(--brand-darker);
    color: var(--brand-text);
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

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

.btn {
    display: inline-block;
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
}

.btn-primary {
    background: var(--brand-accent);
    color: var(--brand-dark);
}

.btn-primary:hover {
    background: var(--brand-accent-hover);
    transform: translateY(-1px);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.error-msg {
    color: var(--brand-error);
    font-size: 14px;
    margin-top: 12px;
    display: none;
}

.success-msg {
    color: var(--brand-success);
    font-size: 14px;
    margin-top: 12px;
    display: none;
}

/* ─── Chat Layout ─── */
.app-layout {
    display: flex;
    height: 100vh;
}

.sidebar {
    width: 280px;
    background: var(--brand-darker);
    border-right: 1px solid var(--brand-border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--brand-border);
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-header h2 {
    font-size: 16px;
    color: var(--brand-accent);
}

.sidebar-user {
    padding: 16px 20px;
    border-bottom: 1px solid var(--brand-border);
    font-size: 13px;
    color: var(--brand-text-muted);
}

.sidebar-user .name {
    color: var(--brand-text);
    font-weight: 600;
}

.sidebar-actions {
    padding: 12px;
}

.btn-new-chat {
    width: 100%;
    padding: 10px;
    background: var(--brand-accent);
    color: var(--brand-dark);
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    font-size: 14px;
}

.btn-new-chat:hover { opacity: 0.9; }

.conversation-list {
    flex: 1;
    overflow-y: auto;
    padding: 8px 12px;
}

.conversation-item {
    padding: 10px 12px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--brand-text-muted);
    margin-bottom: 4px;
    transition: background 0.15s;
}

.conversation-item:hover { background: var(--brand-surface); }
.conversation-item.active { background: var(--brand-surface); color: var(--brand-text); }

.sidebar-footer {
    padding: 12px 20px;
    border-top: 1px solid var(--brand-border);
    font-size: 12px;
    color: var(--brand-text-muted);
}

/* ─── Chat Main ─── */
.chat-main {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.chat-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--brand-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: 16px;
    color: var(--brand-text);
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.message {
    max-width: 80%;
    padding: 14px 18px;
    border-radius: 12px;
    font-size: 15px;
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.message.user {
    align-self: flex-end;
    background: var(--brand-accent);
    color: var(--brand-dark);
    border-bottom-right-radius: 4px;
}

.message.assistant {
    align-self: flex-start;
    background: var(--brand-surface);
    border-bottom-left-radius: 4px;
}

.message.system {
    align-self: center;
    background: transparent;
    color: var(--brand-text-muted);
    font-size: 13px;
    font-style: italic;
}

.tool-indicator {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--brand-surface-light);
    border-radius: 6px;
    font-size: 12px;
    color: var(--brand-text-muted);
    margin: 4px 0;
}

.tool-indicator.success { border-left: 3px solid var(--brand-success); }
.tool-indicator.pending { border-left: 3px solid var(--brand-accent); }

/* ─── Quick Actions ─── */
.quick-actions {
    display: flex;
    gap: 8px;
    padding: 12px 24px;
    flex-wrap: wrap;
}

.quick-action {
    padding: 8px 16px;
    background: var(--brand-surface);
    border: 1px solid var(--brand-border);
    border-radius: 20px;
    color: var(--brand-text-muted);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.quick-action:hover {
    border-color: var(--brand-accent);
    color: var(--brand-accent);
}

/* ─── Input ─── */
.chat-input-area {
    padding: 16px 24px;
    border-top: 1px solid var(--brand-border);
    display: flex;
    gap: 12px;
}

.chat-input-area textarea {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--brand-border);
    border-radius: 12px;
    background: var(--brand-surface);
    color: var(--brand-text);
    font-size: 15px;
    font-family: inherit;
    resize: none;
    outline: none;
    min-height: 48px;
    max-height: 150px;
}

.chat-input-area textarea:focus {
    border-color: var(--brand-accent);
}

.btn-send {
    padding: 12px 20px;
    background: var(--brand-accent);
    color: var(--brand-dark);
    border: none;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    align-self: flex-end;
}

.btn-send:hover { opacity: 0.9; }
.btn-send:disabled { opacity: 0.4; cursor: not-allowed; }

/* ─── Cost Badge ─── */
.cost-badge {
    font-size: 11px;
    color: var(--brand-text-muted);
    padding: 2px 8px;
    background: var(--brand-surface);
    border-radius: 4px;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
    .sidebar { display: none; }
    .message { max-width: 95%; }
}