:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --bg-dark: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --danger: #ef4444;
    --success: #10b981;
    --border-color: #334155;
}

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

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    min-height: 100vh;
}

/* Login Page Styles */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    background: radial-gradient(circle at center, #1e293b 0%, #0f172a 100%);
}

.login-card {
    background: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.login-card h2 {
    margin-bottom: 0.5rem;
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.login-card p {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-main);
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.btn {
    width: 100%;
    padding: 0.875rem;
    border: none;
    border-radius: 0.5rem;
    background: var(--primary-color);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.1s ease;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
}

.btn:hover {
    background: var(--primary-hover);
}

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

.alert {
    padding: 0.75rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Dashboard Layout */
.sidebar {
    width: 260px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
}

.brand {
    font-size: 1.5rem;
    font-weight: bold;
    margin-bottom: 2rem;
    color: white;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.brand span {
    background: linear-gradient(to right, #818cf8, #c084fc);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-item {
    padding: 0.75rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-item:hover, .nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
}

.logout-btn {
    margin-top: auto;
    color: var(--danger);
}
.logout-btn:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.main-content {
    flex: 1;
    padding: 2rem 3rem;
    overflow-y: auto;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.header-top h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(to right, #818cf8, #c084fc);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: white;
}

/* Cards & Forms */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

textarea.form-control {
    resize: vertical;
    min-height: 150px;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%2394a3b8%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem top 50%;
    background-size: 0.65rem auto;
}

.loader {
    display: none;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top: 3px solid white;
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

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

/* Results Area */
.result-box {
    margin-top: 2rem;
    display: none;
}

.result-content {
    background: var(--bg-dark);
    padding: 1.5rem;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    margin-top: 1rem;
    min-height: 200px;
    white-space: pre-wrap;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Plagiarism Badge */
.badge-plag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
}
.plag-safe { background: rgba(16, 185, 129, 0.2); color: var(--success); }
.plag-warn { background: rgba(245, 158, 11, 0.2); color: #f59e0b; }
.plag-danger { background: rgba(239, 68, 68, 0.2); color: var(--danger); }

/* Table */
.table {
    width: 100%;
    border-collapse: collapse;
}

.table th, .table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
}

.action-btn {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    padding: 0.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}
.action-btn:hover {
    background: rgba(99, 102, 241, 0.2);
}