:root {
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-tertiary: #1a1a1a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-dim: #666666;
    --border-primary: #333333;
    --border-active: #ffffff;
    --accent-success: #00ff00;
    --accent-warning: #ffff00;
    --accent-error: #ff4444;
    --accent-info: #4444ff;
    --shadow-glow: 0 0 20px rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Geist Mono', monospace;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.4;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.terminal {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: 0px;
    box-shadow: var(--shadow-glow);
    max-width: 800px;
    width: 100%;
    overflow: hidden;
}

.terminal-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.window-controls {
    display: flex;
    gap: 8px;
}

.control {
    width: 12px;
    height: 12px;
    border-radius: 0px;
    display: inline-block;
    background: var(--text-dim);
}

.control.close {
    background: var(--accent-error);
}

.control.minimize {
    background: var(--accent-warning);
}

.control.maximize {
    background: var(--accent-success);
}

.title-bar {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 600;
}

.prompt {
    color: var(--accent-success);
}

.title {
    color: var(--text-primary);
    letter-spacing: 0.5px;
    font-weight: 700;
}

.cursor {
    color: var(--text-primary);
    animation: blink 1s infinite;
}

@keyframes blink {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0;
    }
}

.terminal-body {
    padding: 24px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-primary);
}

.app-title {
    color: var(--text-primary);
    font-size: 1.1em;
    font-weight: 400;
    letter-spacing: 0.5px;
}

.status-bar {
    display: flex;
    gap: 12px;
}

.status-item {
    background: var(--bg-tertiary);
    padding: 4px 8px;
    border-radius: 0px;
    font-size: 0.8em;
    color: var(--accent-success);
    border: 1px solid var(--border-primary);
}

.input-section {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 24px;
}

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

.input-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9em;
}

.label-text {
    color: var(--text-primary);
    font-weight: 600;
}

.label-desc {
    color: var(--text-dim);
    font-size: 0.8em;
}

.terminal-input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 0px;
    padding: 12px;
    color: var(--text-primary);
    font-family: 'Geist Mono', monospace;
    font-size: 0.9em;
    transition: all 0.3s ease;
}

.terminal-input:focus {
    outline: none;
    border-color: var(--border-active);
    box-shadow: 0 0 10px rgba(255, 255, 255, 0.1);
}

.terminal-input::placeholder {
    color: var(--text-dim);
}

.terminal-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 0px;
    padding: 12px 20px;
    color: var(--text-primary);
    font-family: 'Geist Mono', monospace;
    font-size: 0.9em;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.terminal-btn:hover {
    background: var(--bg-tertiary);
    border-color: var(--border-active);
    transform: translateY(-1px);
}

.terminal-btn.primary {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-primary);
}

.terminal-btn.primary:hover {
    background: var(--text-secondary);
    border-color: var(--text-secondary);
}

.output-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 0px;
    margin-bottom: 20px;
    transition: all 0.3s ease;
}

.output-panel:not(.hide) {
    border-color: var(--border-active);
}

.output-header {
    background: var(--bg-tertiary);
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-primary);
}

.output-title {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1em;
}

.output-status {
    color: var(--accent-success);
    font-size: 0.8em;
    background: rgba(0, 255, 0, 0.1);
    padding: 4px 8px;
    border-radius: 0px;
}

.output-content {
    padding: 20px;
    font-size: 0.95em;
    line-height: 1.6;
}

.result-content {
    font-family: 'Geist Mono', monospace;
}

.grade-pass {
    color: var(--accent-success);
    font-weight: 600;
}

.grade-fail {
    color: var(--accent-error);
    font-weight: 600;
}

.info-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 0px;
}

.info-header {
    background: var(--bg-tertiary);
    padding: 12px 16px;
    border-bottom: 1px solid var(--border-primary);
}

.info-title {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1em;
}

.info-content {
    padding: 16px;
}

.grade-scale {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
    gap: 12px;
}

.grade-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px;
    background: var(--bg-tertiary);
    border-radius: 0px;
    border: 1px solid var(--border-primary);
}

.grade-letter {
    font-weight: 600;
    color: var(--text-primary);
}

.grade-range {
    color: var(--text-dim);
    font-size: 0.8em;
}

.terminal-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-primary);
    padding: 12px 16px;
}

.footer-stats {
    display: flex;
    justify-content: space-between;
    font-size: 0.8em;
    color: var(--text-dim);
}

.stat {
    font-family: 'Geist Mono', monospace;
}

.hide {
    display: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .terminal-body {
        padding: 16px;
    }

    .app-header {
        flex-direction: column;
        gap: 12px;
        align-items: flex-start;
    }

    .grade-scale {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-stats {
        flex-direction: column;
        gap: 8px;
    }
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--text-dim);
    border-radius: 0px;
}

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