frontend/style.css

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

:root {
    --bg-canvas: #fafafa;
    --bg-sidebar: #ffffff;
    --border-color: #eaeaea;
    --text-primary: #171717;
    --text-secondary: #666666;
    --text-tertiary: #a1a1aa;
    --focus-ring: rgba(0, 0, 0, 0.08);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", "Roboto", "Helvetica Neue", sans-serif;
    color: var(--text-primary);
    background-color: var(--bg-canvas);
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

.app-layout {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar Styling (Vercel/Linear Style) */
.sidebar {
    width: 360px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: 1px 0 10px rgba(0,0,0,0.02);
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
    font-size: 16px;
    letter-spacing: -0.02em;
}

.sidebar-content {
    flex-grow: 1;
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.input-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
}

textarea {
    flex-grow: 1;
    width: 100%;
    resize: none;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
    font-family: inherit;
    font-size: 14px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: #fff;
    transition: all 0.2s ease;
    box-shadow: 0 1px 2px rgba(0,0,0,0.02);
}

textarea:focus {
    outline: none;
    border-color: #999;
    box-shadow: 0 0 0 4px var(--focus-ring);
}

textarea::placeholder {
    color: #a1a1aa;
}

/* Minimalist Black Button */
.btn-primary {
    background-color: #000;
    color: #fff;
    border: none;
    border-radius: 6px;
    padding: 12px 16px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover {
    background-color: #333;
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-primary:disabled {
    background-color: #e5e5e5;
    color: #a3a3a3;
    cursor: not-allowed;
}

/* Loading State */
#loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 12px;
}

.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid var(--border-color);
    border-top: 2px solid #000;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    font-size: 12px;
    color: var(--text-tertiary);
}

/* Canvas Area */
.canvas-area {
    flex-grow: 1;
    position: relative;
    background-color: var(--bg-canvas);
    /* Subtle dot pattern for the canvas */
    background-image: radial-gradient(#e5e7eb 1px, transparent 1px);
    background-size: 20px 20px;
}

#markmap {
    width: 100%;
    height: 100%;
}

.disclaimer {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 11px;
    color: var(--text-tertiary);
    text-align: center;
    pointer-events: none;
    z-index: 100;
}

/* Responsive Design for Mobile Devices */
@media (max-width: 768px) {
    .app-layout {
        flex-direction: column;
        height: 100vh;
        overflow-y: auto; /* Allow scrolling if content overflows */
    }

    .sidebar {
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        flex-shrink: 0;
    }

    .sidebar-header {
        padding: 16px;
    }

    .sidebar-content {
        padding: 16px;
        gap: 16px;
    }

    textarea {
        height: 120px; /* Reduce textarea height on mobile */
        flex-grow: 0;
    }

    .canvas-area {
        min-height: 50vh; /* Ensure canvas has enough space */
        flex-grow: 1;
    }

    .sidebar-footer {
        padding: 12px 16px;
    }
}