/* ==========================================================================
   ChemLabX 3.0 — Stylesheet
   المعمل الافتراضي المتطور
   ========================================================================== */

/* ========== AUTH SCREENS (LOGIN / REGISTER / LANDING) ========== */
/* ========== LOGIN SCREEN ========== */
.login-screen {
    position: fixed;
    inset: 0;
    z-index: 10000;
    display: flex;
    align-items: flex-start;
    justify-content: center;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    padding: 24px 16px;
    background: var(--bg-primary);
}
.login-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(var(--accent-green-rgb),0.08) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 20%, rgba(var(--accent-blue-rgb),0.1) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(var(--accent-purple-rgb),0.08) 0%, transparent 50%);
    animation: loginPulse 8s ease-in-out infinite alternate;
}
@keyframes loginPulse {
    0% { opacity: 0.6; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}
.login-card {
    position: relative;
    margin: auto 0;
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 48px 40px;
    text-align: center;
    max-width: 420px;
    width: 100%;
    backdrop-filter: blur(40px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}
.login-logo {
    font-size: 72px;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 20px rgba(var(--accent-green-rgb),0.3));
    animation: float 3s ease-in-out infinite;
}
@keyframes float {
    0%,100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}
.login-title {
    font-size: 32px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
}
.login-subtitle {
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 32px;
}
.login-form { display: flex; flex-direction: column; gap: 16px; }
.login-input-group { text-align: start; }
.login-input-group input,
.login-input-group select {
    width: 100%;
    padding: 14px 18px;
    background: var(--bg-primary);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-arabic);
    font-size: 15px;
    font-weight: 600;
    transition: var(--transition);
    cursor: text;
}
.login-input-group input:focus,
.login-input-group select:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 4px rgba(var(--accent-green-rgb),0.15);
}
.login-input-group input:hover,
.login-input-group select:hover { border-color: rgba(var(--text-secondary-rgb),0.45); }
.login-input-group input::placeholder { color: var(--text-secondary); opacity: 1; }
.login-btn {
    padding: 16px 24px;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-teal));
    border: none;
    border-radius: 14px;
    color: var(--on-primary);
    font-size: 18px;
    font-weight: 800;
    font-family: var(--font-arabic);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 6px 25px rgba(var(--accent-green-rgb),0.3);
}
.login-btn:hover { transform: translateY(-2px); box-shadow: 0 10px 35px rgba(var(--accent-green-rgb),0.4); }
.login-btn:active { transform: translateY(0); }
.login-hint { font-size: 11px; color: var(--text-secondary); margin-top: 8px; }
.login-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-top: 28px;
    padding-top: 24px;
    border-top: 1px solid var(--glass-border);
}
.login-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-secondary);
    padding: 8px 12px;
    border-radius: 10px;
    background: var(--bg-subtle);
}

/* ========== AUTH 4.0 EXTENSIONS ========== */
.auth-canvas {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.5;
}
.login-card-wide { max-width: 480px; }
.auth-back {
    position: absolute;
    top: 10px;
    inset-inline-end: 12px;
    padding: 8px;
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}
.auth-lang {
    position: absolute;
    top: 10px;
    inset-inline-start: 12px;
    z-index: 2;
}
.auth-back:hover { color: var(--accent-green); }
.auth-error {
    min-height: 20px;
    font-size: 12px;
    font-weight: 700;
    color: var(--accent-red);
    text-align: center;
    display: none;
    padding: 8px 12px;
    background: rgba(var(--accent-red-rgb),0.1);
    border: 1px solid rgba(var(--accent-red-rgb),0.2);
    border-radius: 10px;
}
.auth-error.show { display: block; }
.auth-alt {
    margin-top: 16px;
    font-size: 13px;
    color: var(--text-secondary);
    text-align: center;
}
.auth-alt a {
    color: var(--accent-green);
    text-decoration: none;
    font-weight: 700;
    margin-inline-start: 4px;
}
.auth-alt a:hover { text-decoration: underline; }
.auth-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 8px;
    text-align: start;
}
.role-select {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
}
.role-opt {
    display: flex;
    align-items: center;
    gap: 12px;
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: start;
    font-family: var(--font-arabic);
}
.role-opt:hover { border-color: var(--accent-blue); }
.role-opt.active {
    border-color: var(--accent-green);
    background: rgba(var(--accent-green-rgb),0.08);
    box-shadow: 0 0 0 3px rgba(var(--accent-green-rgb),0.12);
}
.role-opt-icon { font-size: 26px; flex-shrink: 0; }
.role-opt-name {
    display: block;
    font-size: 14px;
    font-weight: 800;
    color: var(--text-primary);
}
.role-opt-desc {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}
@media (min-width: 560px) {
    .role-select { grid-template-columns: repeat(3, 1fr); }
}

/* Small phones: keep the full register form reachable without clipping. */
@media (max-width: 560px) {
    .login-screen { padding: 16px 12px; }
    .login-card { padding: 28px 20px; border-radius: 20px; }
    .login-card-wide { max-width: 100%; }
    .login-logo { font-size: 52px; margin-bottom: 8px; }
    .login-title { font-size: 26px; }
    .login-subtitle { margin-bottom: 20px; }
    .login-form { gap: 12px; }
    .login-input-group input,
    .login-input-group select { padding: 12px 14px; font-size: 15px; }
    .login-btn { padding: 14px 20px; font-size: 16px; }
    .role-select { gap: 6px; }
    .role-opt { padding: 10px 12px; gap: 10px; }
    .role-opt-icon { font-size: 22px; }
    .role-opt-desc { font-size: 10px; }
    .login-features { grid-template-columns: 1fr; }
    .auth-back { top: 4px; inset-inline-end: 6px; }
}
@media (max-height: 620px) {
    .login-screen { align-items: flex-start; }
    .login-card { margin: 0 auto; }
}