/* Color Palette from Image */
:root {
    --bg-main: #131722;
    --bg-card: #1b202c;
    --bg-input: #232936;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    
    --accent-blue: #2563eb;
    --accent-blue-hover: #1d4ed8;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    
    --border-color: #2d3748;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', sans-serif;
}

body.dark-theme {
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    background-color: var(--bg-main);
    padding: 1rem 2rem;
    display: flex;
    justify-content: flex-start;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--accent-blue);
    margin-right: 4rem;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 2.5rem;
    flex-grow: 1;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding-bottom: 1rem;
    margin-bottom: -1rem;
    border-bottom: 2px solid transparent;
    transition: all 0.2s;
}

.nav-menu a:hover {
    color: var(--text-primary);
}

.nav-menu a.active {
    color: var(--accent-blue);
    border-bottom: 2px solid var(--accent-blue);
}

.logout-item {
    margin-left: auto;
}

/* Main Dashboard Grid */
.dashboard-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.tool-card {
    background-color: var(--bg-card);
    border-radius: 8px;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

.tool-header {
    margin-bottom: 1.5rem;
}

.tool-header h3 {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.1rem;
    font-weight: 500;
}

.icon-box {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.85rem;
    color: white;
}

.blue-box { background-color: var(--accent-blue); }
.green-box { background-color: var(--accent-green); }
.purple-box { background-color: var(--accent-purple); }

/* Calculator */
.calculator-container {
    background-color: transparent;
}

.calc-display {
    background-color: var(--bg-input);
    border-radius: 6px;
    padding: 1rem 1.25rem;
    font-size: 1.75rem;
    text-align: right;
    margin-bottom: 1rem;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: flex-end;
}

.calc-buttons {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.calc-btn {
    padding: 0.75rem 0;
    font-size: 1.1rem;
    border-radius: 4px;
    border: none;
    background-color: var(--bg-input);
    color: var(--text-primary);
    cursor: pointer;
    transition: opacity 0.2s;
}

.calc-btn:hover { opacity: 0.8; }
.calc-btn:active { transform: scale(0.97); }

.calc-btn.top-row { background-color: #1f2937; }
.calc-btn.clear-text { color: #ef4444; }
.calc-btn.operator { background-color: var(--accent-blue); color: white; }
.calc-zero { grid-column: span 2; }

/* Notepad */
#notepadArea {
    width: 100%;
    flex-grow: 1;
    min-height: 250px;
    background-color: #ffffff;
    color: #1f2937;
    border: none;
    border-radius: 6px;
    padding: 1rem;
    font-size: 0.95rem;
    resize: none;
    margin-bottom: 1rem;
}

#notepadArea::placeholder {
    color: #9ca3af;
}

#notepadArea:focus {
    outline: 2px solid var(--accent-blue);
}

.notepad-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.action-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.4rem 1rem;
    background: transparent;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.green-border {
    border: 1px solid var(--accent-green);
    color: var(--accent-green);
}
.green-border:hover {
    background-color: rgba(16, 185, 129, 0.1);
}

/* Sketchpad */
.sketch-controls-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.color-picker {
    width: 32px;
    height: 32px;
    padding: 0;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
}

.size-select {
    background-color: var(--bg-input);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 0.4rem;
    font-size: 0.85rem;
    outline: none;
}

.size-slider {
    flex-grow: 1;
    accent-color: var(--accent-purple);
}

.sketch-tools {
    display: flex;
    background-color: var(--bg-input);
    border-radius: 6px;
    overflow: hidden;
}

.tool-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 0.5rem 0.75rem;
    cursor: pointer;
}

.tool-btn.active {
    background-color: var(--accent-purple);
    color: white;
}

.canvas-wrapper {
    background-color: #ffffff;
    border-radius: 6px;
    overflow: hidden;
    margin-bottom: 1rem;
}

#sketchCanvas {
    display: block;
    width: 100%;
    background-color: #ffffff;
    cursor: crosshair;
}

.sketch-footer {
    display: flex;
    justify-content: center;
}

.purple-fill {
    background-color: var(--bg-input);
    border: none;
    transition: background-color 0.2s;
}

.purple-fill:hover {
    background-color: var(--accent-purple);
}

/* About Section */
.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex-grow: 1;
    text-align: center;
}

.about-logo {
    width: 80px;
    height: 80px;
    background-color: var(--bg-input);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 2.5rem;
    color: var(--accent-blue);
    margin-bottom: 1.5rem;
}

.about-content h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.about-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.about-content small {
    color: #64748b;
    font-size: 0.8rem;
}


/* Login page fixes to retain original styles if accessed */
.container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}
.login-card {
    background-color: var(--bg-card);
    padding: 2.5rem;
    border-radius: 12px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
}
.login-card h2 { text-align: center; margin-bottom: 0.5rem; }
.subtitle { color: var(--text-secondary); text-align: center; margin-bottom: 2rem; font-size: 0.9rem; }
.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; margin-bottom: 0.5rem; font-size: 0.9rem; color: var(--text-secondary); }
.input-group input {
    width: 100%; padding: 0.75rem 1rem; border-radius: 6px;
    background-color: var(--bg-input); border: 1px solid var(--border-color);
    color: var(--text-primary); font-size: 1rem;
}
.btn {
    width: 100%; padding: 0.875rem; border: none; border-radius: 6px;
    font-size: 1rem; font-weight: 600; cursor: pointer;
}
.primary-btn { background-color: var(--accent-blue); color: white; }