:root {
    --bg: #f8fafc;
    --card: #ffffff;
    --text: #1e293b;
    --primary: #3b82f6;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #e53e3e;
    --border: #e2e8f0;
}

[data-theme="dark"] {
    --bg: #0f172a;
    --card: #1e293b;
    --text: #f1f5f9;
    --border: #334155;
}

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    margin: 0;
    transition: 0.3s ease;
}

.header-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--card);
}

#app-grid {
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 24px;
    max-width: 1100px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: var(--card);
    border-radius: 16px;
    padding: 30px;
    border: 1px solid var(--border);
}

.progress-container {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    margin-bottom: 20px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--primary);
    width: 0%;
    transition: width 0.3s ease;
}

.input-wrapper {
    position: relative;
    width: 100%;
}

input {
    width: 100%;
    padding: 16px;
    font-size: 1.25rem;
    border: 2px solid var(--border);
    border-radius: 12px;
    background: transparent;
    color: var(--text);
    outline: none;
    position: relative;
    z-index: 2;
}

.ghost-text {
    position: absolute;
    top: 18px;
    left: 18px;
    font-size: 1.25rem;
    color: #cbd5e1;
    z-index: 1;
    pointer-events: none;
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    25% {
        transform: translateX(-6px);
    }

    75% {
        transform: translateX(6px);
    }
}

.error-shake {
    animation: shake 0.2s ease-in-out 0s 2;
    border-color: var(--error) !important;
}

.correct-input {
    border-color: var(--success) !important;
}

.feedback-msg {
    margin-top: 15px;
    font-weight: bold;
    min-height: 24px;
}

.accent-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 15px;
}

.accent-bar button {
    padding: 10px;
    cursor: pointer;
    border-radius: 6px;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text);
    font-weight: bold;
}

@media (max-width: 800px) {
    #app-grid {
        grid-template-columns: 1fr;
    }
}