/* =========================================================================
   Unified Auth Styles (Login/Register for Teachers and Students)
   ========================================================================= */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --gradient-primary: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --gradient-orange: linear-gradient(135deg, #f97316 0%, #fbbf24 100%);
    --accent-green: #047857;
    --text-main: #0f172a;
    --text-muted: #64748b;
    --bg-body: #f1f5f9;
    --bg-grid: #e2e8f0;
    --card-bg: #ffffff;
    --border-color: rgba(0,0,0,0.07);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Cairo', sans-serif;
    min-height: 100vh;
    background-color: var(--bg-body);
    background-image: 
        linear-gradient(var(--bg-grid) 1px, transparent 1px),
        linear-gradient(90deg, var(--bg-grid) 1px, transparent 1px);
    background-size: 40px 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    color: var(--text-main);
}

.auth-card {
    background: var(--card-bg);
    max-width: 600px;
    width: 100%;
    padding: 3.5rem 2.5rem;
    border-radius: 32px;
    box-shadow: 0 30px 70px -15px rgba(0,0,0,0.12), 0 0 0 1px var(--border-color);
    animation: slideUp 0.5s cubic-bezier(0.4, 0, 0.2, 1) both;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.header { text-align: center; margin-bottom: 2.5rem; }
.header .logo-icon {
    font-size: 3.5rem; margin-bottom: 1rem; display: block;
    background: var(--gradient-orange);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.header h1 { font-size: 1.8rem; font-weight: 900; letter-spacing: -1px; }
.header p { color: var(--text-muted); font-weight: 700; margin-top: 8px; font-size: 0.95rem; }

.form-group { margin-bottom: 1.5rem; }
label { display: block; margin-bottom: 8px; font-weight: 800; color: var(--text-main); font-size: 0.95rem; }

.input-wrap { position: relative; margin-bottom: 1.2rem;}
.input-wrap i, .input-wrap .inp-icon {
    position: absolute; right: 1.2rem; top: 50%; transform: translateY(-50%);
    color: var(--text-muted); font-size: 1.25rem; transition: 0.3s;
    pointer-events: none;
}

input, select {
    width: 100%; padding: 1.15rem 3.2rem 1.15rem 1.2rem; border-radius: 16px; 
    border: 2px solid var(--bg-grid); outline: none; transition: 0.3s; 
    font-size: 1.05rem; font-weight: 600; background: #fff; font-family: inherit;
    color: var(--text-main);
}
input:focus, select:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1); }
input:focus ~ .inp-icon, input:focus ~ i { color: var(--primary); }

.btn-submit {
    width: 100%; padding: 1.2rem; border-radius: 18px; border: none;
    background: var(--gradient-orange);
    color: #fff; font-size: 1.25rem; font-weight: 900; cursor: pointer;
    transition: 0.3s; margin-top: 1rem;
    display: flex; align-items: center; justify-content: center; gap: 10px;
    box-shadow: 0 10px 25px rgba(249, 115, 22, 0.2);
}
.btn-submit:hover { transform: translateY(-3px); box-shadow: 0 15px 35px rgba(249, 115, 22, 0.3); }

.alert { 
    padding: 1rem 1.2rem; border-radius: 14px; margin-bottom: 1.5rem; 
    font-weight: 700; font-size: 0.95rem; display: flex; align-items: center; gap: 10px;
    border: 1px solid;
}
.alert-error { background: #fef2f2; border-color: #fecaca; color: #b91c1c; }
.alert-success { background: #ecfdf5; border-color: #a7f3d0; color: #047857; text-align: center; }

.back-link { text-align: center; margin-top: 2rem; }
.back-link a {
    color: var(--text-muted); text-decoration: none; font-weight: 700;
    display: inline-flex; align-items: center; gap: 6px;
    padding: 0.5rem 1.2rem; border-radius: 50px;
    border: 1.5px solid var(--border-color); background: #fff; transition: 0.3s;
}
.back-link a:hover { color: var(--primary); border-color: var(--primary); }

.logo { text-align: center; margin-bottom: 2.5rem; }
.logo .site-name {
    font-size: 3.5rem; font-weight: 900; letter-spacing: -2px;
    background: var(--gradient-orange);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    display: block; line-height: 1;
}
.logo p { color: var(--text-muted); font-weight: 700; font-size: 1.1rem; margin-top: 10px; }