/* === PROFESSIONAL ACADEMIC THEME === */
:root {
    /* Academic Colors */
    --primary: #0f172a;       /* Dark Navy (Trustworthy) */
    --primary-hover: #1e293b; /* Slightly lighter navy */
    --accent: #2563eb;        /* Royal Blue (Action) */
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border: #cbd5e1;
    --bg-input: #ffffff;
    --bg-body: #f1f5f9;
    --white: #ffffff;
    --danger: #ef4444;
    --radius: 6px;            /* Sharp corners = Professional */
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; }

body {
    height: 100vh;
    overflow: hidden;
    background: var(--bg-body);
}

/* === SPLIT LAYOUT === */
.split-container {
    display: flex;
    height: 100%;
    width: 100%;
    box-shadow: 0 0 20px rgba(0,0,0,0.05);
}

/* Left Panel: Branding */
.brand-panel {
    flex: 0 0 40%; /* Fixed width 40% */
    background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
    color: var(--white);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 60px;
    position: relative;
}

.brand-panel h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    letter-spacing: -0.5px;
}

.brand-panel p {
    font-size: 1.1rem;
    color: #94a3b8;
    line-height: 1.6;
    max-width: 400px;
}

/* Right Panel: Form */
.form-panel {
    flex: 1;
    background: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px;
    overflow-y: auto;
}

.auth-box {
    width: 100%;
    max-width: 400px;
}

.form-header { margin-bottom: 30px; }
.form-header h2 { font-size: 1.8rem; color: var(--text-main); margin-bottom: 8px; }
.form-header p { color: var(--text-muted); font-size: 0.95rem; }

/* === FORM ELEMENTS === */
.form-group { margin-bottom: 20px; }

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-main);
    margin-bottom: 8px;
}

/* Professional Input */
.input-group {
    position: relative;
}

.input-group i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #94a3b8;
    font-size: 1rem;
}

.form-input {
    width: 100%;
    padding: 12px 15px 12px 40px; /* Space for icon */
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    color: var(--text-main);
    transition: all 0.2s ease;
    background: var(--bg-input);
}

/* Focus State - subtle blue glow */
.form-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}
.form-input:focus + i { color: var(--accent); }

/* Select Dropdown */
select.form-input {
    cursor: pointer;
    background-color: white;
}

/* === BUTTONS === */
.btn-submit {
    width: 100%;
    padding: 12px;
    background-color: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-top: 10px;
}

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

/* Links and Footer */
.form-footer {
    margin-top: 25px;
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
}
.form-footer a {
    color: var(--accent);
    text-decoration: none;
    font-weight: 600;
}
.form-footer a:hover { text-decoration: underline; }

/* Error Message */
.alert {
    padding: 12px;
    background: #fef2f2;
    border: 1px solid #fca5a5;
    color: #991b1b;
    border-radius: var(--radius);
    font-size: 0.9rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.field-error {
    font-size: 0.85rem;
    color: var(--danger);
    margin-top: 5px;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .split-container { flex-direction: column; }
    .brand-panel { display: none; } /* Hide left panel on mobile for cleanliness */
    .form-panel { padding: 20px; }
}