/* ============================================================
 notok  Students Valley - Header & Navigation
   ============================================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: var(--bg-header);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    z-index: 100;
    transition: background var(--transition-slow), border-color var(--transition-slow);
}

.header__inner {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-5);
}

/* Logo */
.header__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--fs-lg);
    font-weight: var(--fw-extrabold);
    color: var(--text-primary);
    flex-shrink: 0;
    text-decoration: none;
}
.header__logo:hover { color: var(--text-primary); }
.header__logo-icon {
    width: 135px;
    height: auto;
    background: linear-gradient(135deg, var(--color-primary), #7C3AED);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1rem;
}
[data-theme="dark"] .header__logo-icon {
    background: linear-gradient(135deg, #818CF8, #A78BFA);
}
.header__logo span {
    background: linear-gradient(135deg, var(--color-primary), #7C3AED);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
[data-theme="dark"] .header__logo span {
    background: linear-gradient(135deg, #818CF8, #C4B5FD);
    -webkit-background-clip: text;
    background-clip: text;
}

/* Search */
.header__search {
    flex: 1;
    max-width: 480px;
    position: relative;
}
.header__search input {
    width: 100%;
    padding: var(--space-2) var(--space-4) var(--space-2) 40px;
    background: var(--bg-muted);
    border: 1.5px solid transparent;
    border-radius: var(--radius-full);
    font-size: var(--fs-sm);
    transition: all var(--transition-fast);
    color: var(--text-primary);
}
.header__search input:focus {
    background: var(--bg-surface);
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
.header__search input::placeholder { color: var(--text-muted); }
.header__search i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: var(--fs-sm);
}

/* Nav Actions */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.header__action-btn {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    position: relative;
    transition: all var(--transition-fast);
}
.header__action-btn:hover {
    background: var(--bg-muted);
    color: var(--color-primary);
}
.header__action-btn .count-badge {
    position: absolute;
    top: 4px;
    right: 4px;
    width: 16px;
    height: 16px;
    background: var(--color-danger);
    color: #fff;
    font-size: 10px;
    font-weight: var(--fw-bold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Theme Toggle */
.theme-toggle {
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    cursor: pointer;
    font-size: 1rem;
}
.theme-toggle:hover {
    background: var(--bg-muted);
    color: var(--color-secondary);
}

/* User Menu */
.header__user {
    position: relative;
}
.header__user-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background var(--transition-fast);
}
.header__user-toggle:hover { background: var(--bg-muted); }
.header__user-toggle .avatar { width: 32px; height: 32px; }
.header__user-name {
    font-size: var(--fs-sm);
    font-weight: var(--fw-semibold);
    max-width: 100px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Dropdown */
.dropdown {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    min-width: 200px;
    background: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-base);
    z-index: 200;
    padding: var(--space-2);
}
.dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.dropdown__item {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    font-size: var(--fs-sm);
    color: var(--text-secondary);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    width: 100%;
    text-align: left;
}
.dropdown__item:hover {
    background: var(--bg-muted);
    color: var(--color-primary);
}
.dropdown__item i { width: 16px; text-align: center; }
.dropdown__divider {
    height: 1px;
    background: var(--divider);
    margin: var(--space-2) 0;
}
.dropdown__item--danger { color: var(--color-danger); }
.dropdown__item--danger:hover { background: var(--color-danger-light); color: var(--color-danger); }

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    width: 38px;
    height: 38px;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: 1.25rem;
    border-radius: var(--radius-md);
}

/* Mobile Nav */
.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-surface);
    z-index: 99;
    flex-direction: column;
    overflow-y: auto;
    transform: translateX(100%);
    transition: transform var(--transition-base);
}
.mobile-nav.open { transform: translateX(0); }

.mobile-nav__content {
    flex: 1;
    padding: var(--space-6) var(--space-5);
    overflow-y: auto;
}

.mobile-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4) var(--space-4);
    font-size: var(--fs-base);
    font-weight: var(--fw-medium);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-1);
}
.mobile-nav__link:hover, .mobile-nav__link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}
.mobile-nav__link i { width: 20px; text-align: center; color: var(--text-muted); }
.mobile-nav__link:hover i, .mobile-nav__link.active i { color: var(--color-primary); }

/* Desktop Nav Links */
.desktop-nav {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    flex-shrink: 0;
}
.desktop-nav__link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--fs-sm);
    font-weight: var(--fw-medium);
    color: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
    white-space: nowrap;
}
.desktop-nav__link:hover, .desktop-nav__link.active {
    background: var(--color-primary-light);
    color: var(--color-primary);
}

/* ---- Responsive: Tablet ---- */
@media (max-width: 1024px) {
    .header__search { display: none; }
    .desktop-nav__link span { display: none; }
    .desktop-nav { gap: 0; }
}

/* ---- Responsive: Mobile ---- */
@media (max-width: 768px) {
    .mobile-menu-toggle { display: flex; }
    .header__user-name { display: none; }
    .mobile-nav { display: flex; }
    .desktop-nav { display: none !important; }
    .header__actions .header__action-btn:not(.header__mobile-visible) { display: none; }
    .header__actions .theme-toggle { display: none; }
    .header__actions .header__user { display: none; }
    /* Show mobile guest icon, hide desktop guest dropdown */
    .header__guest-icon { display: flex !important; }
    .header__guest-menu { display: none !important; }

    /* Mobile Icon Unification */
    .header__mobile-visible, .mobile-menu-toggle {
        width: 38px !important;
        height: 38px !important;
        font-size: 1.25rem !important;
        color: var(--text-primary) !important;
        display: flex !important;
        align-items: center;
        justify-content: center;
    }
}


/* Mobile Nav Footer & Account Card */
.mobile-nav__footer {
    margin-top: auto;
    padding: var(--space-6) var(--space-4) var(--space-2);
    border-top: 1px solid var(--divider);
    background: var(--bg-surface);
    position: sticky;
    bottom: 0;
}

.mobile-nav__account {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--bg-muted);
    border-radius: var(--radius-lg);
}

.mobile-nav__account-info {
    flex: 1;
    min-width: 0;
}

.mobile-nav__account-info div {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Guest menu: desktop vs mobile defaults */
.header__guest-icon { display: none; }
.header__guest-menu { display: block; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
    background: var(--bg-surface);
    border-top: 1px solid var(--border-color);
    padding: var(--space-10) 0 var(--space-6);
    margin-top: auto;
}

.footer__grid {
    display: grid;
    grid-template-columns: 1.5fr repeat(3, 1fr);
    gap: var(--space-8);
    margin-bottom: var(--space-8);
}

.footer__brand-name {
    font-size: var(--fs-lg);
    font-weight: var(--fw-extrabold);
    margin-bottom: var(--space-3);
    background: linear-gradient(135deg, var(--color-primary), #7C3AED);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer__brand-desc {
    font-size: var(--fs-sm);
    color: var(--text-muted);
    line-height: var(--lh-relaxed);
    max-width: 280px;
}

.footer__col-title {
    font-size: var(--fs-sm);
    font-weight: var(--fw-bold);
    color: var(--text-primary);
    margin-bottom: var(--space-4);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer__link {
    display: block;
    font-size: var(--fs-sm);
    color: var(--text-muted);
    padding: var(--space-1) 0;
    transition: color var(--transition-fast);
}
.footer__link:hover { color: var(--color-primary); }

.footer__bottom {
    border-top: 1px solid var(--divider);
    padding-top: var(--space-5);
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: var(--fs-xs);
    color: var(--text-muted);
}

.footer__social {
    display: flex;
    gap: var(--space-3);
}
.footer__social a {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    background: var(--bg-muted);
    transition: all var(--transition-fast);
}
.footer__social a:hover {
    background: var(--color-primary);
    color: #fff;
}

@media (max-width: 768px) {
    .footer__grid { grid-template-columns: 1fr 1fr; gap: var(--space-6); }
    .footer__bottom { flex-direction: column; gap: var(--space-3); text-align: center; }
}

@media (max-width: 480px) {
    .footer__grid { grid-template-columns: 1fr; }
}

/* Floating Donation Button */
.floating-donate {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
}

.floating-donate-btn {
    padding: 0 var(--space-5);
    height: 54px;
    background: linear-gradient(135deg, #FF4B2B, #FF416C);
    color: white;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-size: var(--fs-md);
    font-weight: var(--fw-bold);
    box-shadow: 0 10px 25px rgba(255, 65, 108, 0.4);
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    animation: donate-entrance 1s cubic-bezier(0.175, 0.885, 0.32, 1.275), donate-pulse 2s infinite 1s;
    white-space: nowrap;
}

.floating-donate-btn i {
    font-size: 1.2rem;
}

.donate-text {
    display: inline-block;
}

.floating-donate-btn:hover {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 15px 30px rgba(255, 65, 108, 0.6);
    color: white;
}

@keyframes donate-entrance {
    0% { transform: scale(0) rotate(-45deg); opacity: 0; }
    70% { transform: scale(1.1) rotate(5deg); }
    100% { transform: scale(1) rotate(0); opacity: 1; }
}

@keyframes donate-pulse {
    0% { box-shadow: 0 10px 25px rgba(255, 65, 108, 0.4); }
    50% { box-shadow: 0 15px 35px rgba(255, 65, 108, 0.7); }
    100% { box-shadow: 0 10px 25px rgba(255, 65, 108, 0.4); }
}

@media (max-width: 768px) {
    .floating-donate {
        bottom: 20px;
        right: 20px;
    }
    .floating-donate-btn {
        height: 48px;
        padding: 0 var(--space-4);
        font-size: var(--fs-sm);
    }
}