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

/* ========== NAVBAR ========== */
/* ========== NAVBAR ========== */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(30px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    padding: 14px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    flex-wrap: wrap;
    gap: 12px;
    box-shadow: 0 4px 30px rgba(0,0,0,0.3);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 26px;
    font-weight: 900;
    text-decoration: none;
    background: linear-gradient(135deg, var(--accent-green), var(--accent-teal), var(--accent-blue), var(--accent-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
    position: relative;
}
.logo::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-green), transparent);
    opacity: 0.5;
}
.logo .icon { 
    font-size: 32px; 
    -webkit-text-fill-color: initial; 
    filter: drop-shadow(0 0 12px rgba(var(--accent-green-rgb),0.4));
    animation: icon-pulse 3s ease-in-out infinite;
}
@keyframes icon-pulse {
    0%, 100% { transform: scale(1); filter: drop-shadow(0 0 12px rgba(var(--accent-green-rgb),0.4)); }
    50% { transform: scale(1.1); filter: drop-shadow(0 0 20px rgba(var(--accent-green-rgb),0.6)); }
}
.logo .version {
    font-size: 11px;
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: var(--on-bright);
    -webkit-text-fill-color: var(--on-bright);
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 700;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 10px rgba(var(--accent-purple-rgb),0.3);
}

.nav-links { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
    padding: 10px 18px;
    border-radius: 12px;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.nav-links a::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(var(--accent-green-rgb),0.1), rgba(var(--accent-blue-rgb),0.1));
    opacity: 0;
    transition: opacity 0.3s;
}
.nav-links a:hover::before { opacity: 1; }
.nav-links a:hover { color: var(--text-primary); transform: translateY(-2px); }
.nav-links a.active { 
    color: var(--accent-green); 
    background: rgba(var(--accent-green-rgb),0.15); 
    border: 1px solid rgba(var(--accent-green-rgb),0.3);
    box-shadow: var(--glow-green);
}
.badge {
    background: linear-gradient(135deg, var(--accent-red), var(--accent-pink));
    color: var(--on-bright);
    font-size: 10px;
    padding: 3px 10px;
    border-radius: 20px;
    font-weight: 700;
    animation: pulse-badge 2s infinite;
    box-shadow: 0 2px 8px rgba(var(--accent-red-rgb),0.3);
}
@keyframes pulse-badge { 
    0%,100% { opacity: 1; transform: scale(1); } 
    50% { opacity: 0.8; transform: scale(1.05); } 
}

/* ========== LANGUAGE TOGGLE ========== */
.btn-lang {
    padding: 8px 16px;
    background: linear-gradient(135deg, rgba(var(--accent-purple-rgb),0.15), rgba(var(--accent-blue-rgb),0.15));
    border: 1px solid var(--accent-purple);
    color: var(--accent-purple);
    border-radius: 20px;
    cursor: pointer;
    transition: var(--transition);
    font-size: 12px;
    font-weight: 700;
    font-family: var(--font-mono);
    letter-spacing: 0.5px;
}
.btn-lang:hover {
    background: var(--accent-purple);
    color: var(--on-bright);
    box-shadow: 0 4px 15px rgba(var(--accent-purple-rgb),0.3);
    transform: translateY(-1px);
}

.btn-profile {
    background: linear-gradient(135deg, var(--bg-card), var(--bg-hover));
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 12px 24px;
    border-radius: 30px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 600;
    position: relative;
    overflow: hidden;
}
.btn-profile::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(var(--accent-green-rgb),0.2), rgba(var(--accent-blue-rgb),0.2));
    opacity: 0;
    transition: opacity 0.3s;
}
.btn-profile:hover::before { opacity: 1; }
.btn-profile:hover { 
    border-color: var(--accent-green); 
    box-shadow: var(--glow-green); 
    transform: translateY(-2px) scale(1.02); 
}

/* ========== TOAST ========== */
/* ========== TOAST ========== */
.toast-container {
    position: fixed;
    bottom: 20px;
    inset-inline-end: 16px;
    z-index: 10060;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-width: min(340px, calc(100vw - 32px));
    pointer-events: none;
}
.toast {
    padding: 10px 14px;
    border-radius: 10px;
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 8px 24px rgba(0,0,0,0.6);
    animation: slide-in 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    font-size: 12px;
    pointer-events: auto;
}
.toast.danger { border-left: 3px solid var(--accent-red); }
.toast.success { border-left: 3px solid var(--accent-green); }
.toast.warning { border-left: 3px solid var(--accent-orange); }
.toast.purple { border-left: 3px solid var(--accent-purple); }
.toast .icon { font-size: 18px; }
.toast .msg { font-size: 12px; }
@keyframes slide-in {
    from { transform: translateX(100px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* ========== MODAL ========== */
/* ========== MODAL ========== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: var(--overlay-bg); 
    backdrop-filter: blur(15px) saturate(150%);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    animation: modal-bg-in 0.4s ease;
}
@keyframes modal-bg-in {
    from { opacity: 0; }
    to { opacity: 1; }
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--bg-secondary);
    border-radius: 20px;
    border: 1px solid var(--glass-border);
    padding: 0;
    max-width: 780px;
    width: 92%;
    max-height: 86vh;
    overflow: hidden;
    box-shadow: 0 40px 100px rgba(0,0,0,0.9), 0 0 60px rgba(var(--accent-green-rgb),0.1);
    animation: modal-in 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    position: relative;
    display: flex;
    flex-direction: column;
}
.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 24px 36px 36px;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    will-change: scroll-position;
}
.modal-body::-webkit-scrollbar { width: 6px; }
.modal-body::-webkit-scrollbar-track { background: transparent; }
.modal-body::-webkit-scrollbar-thumb { background: rgba(var(--text-secondary-rgb),0.35); border-radius: 10px; }
.modal-body::-webkit-scrollbar-thumb:hover { background: rgba(var(--text-secondary-rgb),0.55); }
.modal::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(180deg, rgba(var(--accent-green-rgb),0.08), transparent);
    pointer-events: none;
    border-radius: 20px 20px 0 0;
}
@keyframes modal-in {
    from { transform: scale(0.85) translateY(30px); opacity: 0; }
    to { transform: scale(1) translateY(0); opacity: 1; }
}
.modal h2 { 
    font-size: 24px; 
    margin: 0; 
    padding: 24px 36px;
    display: flex; 
    align-items: center; 
    gap: 14px; 
    font-weight: 800;
    position: sticky;
    top: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--glass-border);
    border-radius: 20px 20px 0 0;
    z-index: 10;
}
.modal .close-modal {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 10px 22px;
    border-radius: 12px;
    cursor: pointer;
    margin-inline-start: auto;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
}
.modal .close-modal:hover { 
    background: linear-gradient(135deg, var(--accent-red), color-mix(in srgb, var(--accent-red) 80%, #000)); 
    color: var(--on-bright); 
    border-color: var(--accent-red);
    box-shadow: 0 4px 20px rgba(var(--accent-red-rgb),0.3);
    transform: scale(1.05);
}
.experiment-card {
    background: var(--bg-card);
    border-radius: 18px;
    padding: 22px;
    margin-bottom: 14px;
    border: 1px solid var(--glass-border);
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    position: relative;
    overflow: hidden;
    contain: content;
}
.experiment-card:hover {
    border-color: var(--accent-green);
    box-shadow: 0 6px 20px rgba(var(--accent-green-rgb),0.12);
}
.experiment-card h3 { font-size: 17px; margin-bottom: 8px; font-weight: 700; position: relative; }
.experiment-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; position: relative; }
.experiment-card .tags { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; position: relative; }
.experiment-card .tags span {
    font-size: 10px;
    padding: 5px 14px;
    border-radius: 20px;
    font-weight: 600;
}
.tags .tag-safe { 
    background: linear-gradient(135deg, rgba(var(--accent-green-rgb),0.2), rgba(var(--accent-green-rgb),0.1)); 
    color: var(--accent-green);
    border: 1px solid rgba(var(--accent-green-rgb),0.2);
}
.tags .tag-danger { 
    background: linear-gradient(135deg, rgba(var(--accent-red-rgb),0.2), rgba(var(--accent-red-rgb),0.1)); 
    color: var(--accent-red);
    border: 1px solid rgba(var(--accent-red-rgb),0.2);
}
.tags .tag-warning { 
    background: linear-gradient(135deg, rgba(var(--accent-orange-rgb),0.2), rgba(var(--accent-orange-rgb),0.1)); 
    color: var(--accent-orange);
    border: 1px solid rgba(var(--accent-orange-rgb),0.2);
}
.tags .tag-info { 
    background: linear-gradient(135deg, rgba(var(--accent-blue-rgb),0.2), rgba(var(--accent-blue-rgb),0.1)); 
    color: var(--accent-blue);
    border: 1px solid rgba(var(--accent-blue-rgb),0.2);
}

/* ========== LESSONS MODAL + CONTENT ========== */
/* ========== LESSONS MODAL ========== */
.lesson-card {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 20px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: border-color 0.2s, box-shadow 0.2s;
    contain: content;
}
.lesson-card:hover {
    border-color: var(--accent-green);
    box-shadow: 0 8px 25px rgba(var(--accent-green-rgb),0.15);
}
.lesson-card h3 { font-size: 16px; margin-bottom: 8px; }
.lesson-card p { font-size: 13px; color: var(--text-secondary); margin-bottom: 10px; }

/* ========== LESSON CONTENT ========== */
.btn-back {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    color: var(--accent-blue);
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 13px;
    font-family: var(--font-arabic);
    font-weight: 600;
    margin-bottom: 16px;
    transition: var(--transition);
}
.btn-back:hover { background: rgba(var(--accent-blue-rgb),0.1); border-color: var(--accent-blue); }
.lesson-section {
    background: var(--bg-card);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 18px;
    margin-bottom: 14px;
}
.lesson-section h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--accent-green);
    margin-bottom: 10px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--glass-border);
}
.lesson-section p, .lesson-section li {
    font-size: 13px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.lesson-section ul {
    padding-inline-start: 20px;
    margin: 0;
}
.lesson-section .formula-box {
    background: rgba(var(--accent-green-rgb),0.08);
    border: 1px solid rgba(var(--accent-green-rgb),0.15);
    border-radius: 8px;
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 13px;
    color: var(--accent-green);
    direction: ltr;
    text-align: center;
    margin: 10px 0;
}
.lesson-section .warning-box {
    background: rgba(var(--accent-red-rgb),0.08);
    border: 1px solid rgba(var(--accent-red-rgb),0.15);
    border-radius: 8px;
    padding: 12px;
    font-size: 12px;
    color: var(--accent-red);
    margin: 10px 0;
}
.lesson-section .try-box {
    background: rgba(var(--accent-blue-rgb),0.08);
    border: 1px solid rgba(var(--accent-blue-rgb),0.15);
    border-radius: 8px;
    padding: 12px;
    font-size: 12px;
    color: var(--accent-blue);
    margin: 10px 0;
    cursor: pointer;
    transition: var(--transition);
}
.lesson-section .try-box:hover {
    background: rgba(var(--accent-blue-rgb),0.15);
}

/* ========== SHARED PAGE UTILITIES (ChemLabX 4.0) ========== */
.btn-logout {
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: var(--bg-card);
    color: var(--accent-red);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}
.btn-logout:hover {
    background: var(--accent-red);
    color: var(--on-bright);
    border-color: var(--accent-red);
    transform: translateY(-2px);
}
.role-chip {
    font-size: 10px;
    font-weight: 700;
    background: linear-gradient(135deg, rgba(var(--accent-purple-rgb),0.2), rgba(var(--accent-blue-rgb),0.2));
    border: 1px solid rgba(var(--accent-purple-rgb),0.3);
    color: var(--accent-purple);
    padding: 3px 10px;
    border-radius: 20px;
    margin-inline-start: 4px;
}
.page-shell {
    min-height: calc(100vh - 76px);
    padding: 24px;
    max-width: 1400px;
    margin: 0 auto;
}
.page-title {
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 6px;
    background: linear-gradient(135deg, var(--text-primary), var(--accent-green));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.page-sub {
    color: var(--text-secondary);
    font-size: 13px;
    margin-bottom: 24px;
}
.btn {
    padding: 12px 22px;
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-arabic);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    justify-content: center;
}
.btn:hover { transform: translateY(-2px); border-color: var(--accent-blue); }
.btn-primary {
    background: linear-gradient(135deg, var(--accent-green), var(--accent-teal));
    color: var(--on-primary);
    border: none;
    box-shadow: 0 6px 25px rgba(var(--accent-green-rgb),0.3);
}
.btn-primary:hover { box-shadow: 0 10px 35px rgba(var(--accent-green-rgb),0.4); }
.btn-purple {
    background: linear-gradient(135deg, var(--accent-purple), var(--accent-pink));
    color: var(--on-bright);
    border: none;
    box-shadow: 0 6px 25px rgba(var(--accent-purple-rgb),0.3);
}
.btn-danger {
    background: linear-gradient(135deg, var(--accent-red), var(--accent-pink));
    color: var(--on-bright);
    border: none;
}
.btn-ghost { background: transparent; }
.btn-sm { padding: 8px 14px; font-size: 12px; border-radius: 10px; }
.btn:disabled { opacity: 1; background: var(--bg-card); color: var(--text-secondary); box-shadow: none; cursor: not-allowed; transform: none; }

.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 22px;
    box-shadow: var(--shadow-card);
}
.card-title {
    font-size: 15px;
    font-weight: 800;
    margin-bottom: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-primary);
}

.form-field { margin-bottom: 16px; text-align: start; }
.form-label {
    display: block;
    font-size: 12px;
    font-weight: 700;
    color: var(--text-secondary);
    margin-bottom: 8px;
}
.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 13px 16px;
    background: var(--bg-primary);
    border: 2px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-arabic);
    font-size: 14px;
    font-weight: 600;
    transition: var(--transition);
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
    border-color: var(--accent-green);
    box-shadow: 0 0 0 4px rgba(var(--accent-green-rgb),0.12);
}
.form-input::placeholder { color: var(--text-secondary); opacity: 1; }
.form-textarea { min-height: 90px; resize: vertical; }
.form-hint { font-size: 11px; color: var(--text-secondary); margin-top: 6px; }

.empty-state {
    text-align: center;
    padding: 48px 20px;
    color: var(--text-secondary);
}
.empty-state .icon { font-size: 52px; margin-bottom: 14px; opacity: 0.6; }
.empty-state p { font-size: 14px; }

.tag {
    display: inline-block;
    font-size: 10px;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 20px;
    border: 1px solid var(--glass-border);
}
.tag-green { color: var(--accent-green); background: rgba(var(--accent-green-rgb),0.12); border-color: rgba(var(--accent-green-rgb),0.3); }
.tag-blue { color: var(--accent-blue); background: rgba(var(--accent-blue-rgb),0.12); border-color: rgba(var(--accent-blue-rgb),0.3); }
.tag-purple { color: var(--accent-purple); background: rgba(var(--accent-purple-rgb),0.12); border-color: rgba(var(--accent-purple-rgb),0.3); }
.tag-orange { color: var(--accent-orange); background: rgba(var(--accent-orange-rgb),0.12); border-color: rgba(var(--accent-orange-rgb),0.3); }
.tag-red { color: var(--accent-red); background: rgba(var(--accent-red-rgb),0.12); border-color: rgba(var(--accent-red-rgb),0.3); }