:root {
    --bg-main: #0a0a0f;
    --bg-card: rgba(20, 20, 30, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.5);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --success: #10b981;
    --danger: #ef4444;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.6;
    position: relative;
    display: flex;
    justify-content: center;
}

/* Background Animation */
#bg-animation {
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200vw;
    height: 200vh;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
                radial-gradient(circle at 80% 20%, rgba(236, 72, 153, 0.05) 0%, transparent 40%);
    animation: rotateBg 60s linear infinite;
}

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

.app-container {
    width: 100%;
    max-width: 800px;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 2.5rem;
    background: linear-gradient(to right, #a855f7, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-align: center;
    margin-bottom: 2rem;
}

.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    margin-bottom: 2rem;
    animation: fadeIn 0.4s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.input-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    padding: 0.8rem 1rem;
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.2s ease;
    outline: none;
}

textarea {
    resize: vertical;
    min-height: 80px;
}

input:focus, textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 2px var(--primary-glow);
}

button {
    background: var(--primary);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

button:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px var(--primary-glow);
}

button:active {
    transform: translateY(1px);
}

button.secondary {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
}

button.secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    box-shadow: none;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: 0.5rem; }
.gap-4 { gap: 1rem; }

/* Test Question Styles */
.question-block {
    margin-bottom: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}
.question-block:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.question-title {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: 0.8rem;
}

.question-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

pre[class*="language-"] {
    border-radius: 8px !important;
    margin-bottom: 1.2rem !important;
    border: 1px solid var(--border-color) !important;
    background: rgba(0, 0, 0, 0.4) !important;
}

code[class*="language-"] {
    font-family: 'Fira Code', monospace !important;
    font-size: 0.9rem !important;
}

/* Admin Dashboard */
.badge {
    background: rgba(16, 185, 129, 0.2);
    color: var(--success);
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 600;
}

.code-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
}

.code-list li {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    font-family: 'Fira Code', monospace;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.submissions-list {
    margin-top: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.submission-item {
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.submission-item:hover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.submission-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
}

.submission-answers {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-color);
    display: none;
}

.submission-item.active .submission-answers {
    display: block;
}

.answer-row {
    margin-bottom: 0.8rem;
}
.answer-row strong {
    color: var(--primary);
    font-size: 0.9rem;
    display: block;
    margin-bottom: 0.2rem;
}
.answer-row div {
    color: var(--text-secondary);
    font-size: 0.95rem;
    white-space: pre-wrap;
    background: rgba(255, 255, 255, 0.02);
    padding: 0.5rem;
    border-radius: 4px;
}

.admin-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}
.admin-tab {
    padding: 0.8rem 1rem;
    cursor: pointer;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
}
.admin-tab:hover {
    color: var(--text-primary);
}
.admin-tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}

.alert {
    padding: 0.8rem;
    border-radius: 6px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    display: none;
}
.alert.error { background: rgba(239, 68, 68, 0.1); color: var(--danger); border: 1px solid rgba(239, 68, 68, 0.2); display: block;}
.alert.success { background: rgba(16, 185, 129, 0.1); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.2); display: block;}

.notice {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 1rem;
    text-align: center;
}

/* Loader Styles */
.loader-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(10, 10, 15, 0.8);
    backdrop-filter: blur(4px);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.spinner {
    width: 60px;
    height: 60px;
    border: 5px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}