/* ============================================
   INTERACTIVE - Accordion, Modal, Mobile Menu
   ============================================ */

/* ==========================================
   FAQ ACCORDION
   ========================================== */
.accordion {
    max-width: 700px;
    margin: 0 auto;
}

.accordion-item {
    background: var(--c-surface);
    border: 1px solid var(--c-border);
    border-radius: var(--radius-lg);
    margin-bottom: var(--sp-3);
    overflow: hidden;
}

.accordion-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--sp-4);
    padding: var(--sp-5) var(--sp-6);
    background: none;
    border: none;
    font-family: inherit;
    font-size: var(--text-base);
    font-weight: 600;
    color: var(--c-dark);
    text-align: left;
    cursor: pointer;
    transition: background var(--duration-fast) var(--ease-standard);
}

.accordion-trigger:hover {
    background: var(--c-bg);
}

.accordion-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    transition: transform var(--duration-base) var(--ease-standard);
}

.accordion-item[open] .accordion-icon {
    transform: rotate(180deg);
}

.accordion-content {
    padding: 0 var(--sp-6) var(--sp-6);
    color: var(--c-text-soft);
    line-height: var(--leading-relaxed);
}

/* Details/Summary native Accordion */
details.accordion-item summary {
    list-style: none;
}

details.accordion-item summary::-webkit-details-marker {
    display: none;
}


/* ==========================================
   MODAL / DIALOG
   ========================================== */
.modal-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: 
        opacity var(--duration-base) var(--ease-standard),
        visibility var(--duration-base) var(--ease-standard);
}

.modal-backdrop.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    z-index: 1001;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    background: var(--c-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transition: 
        opacity var(--duration-base) var(--ease-out),
        transform var(--duration-base) var(--ease-out),
        visibility var(--duration-base) var(--ease-out);
}

.modal.active {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, -50%) scale(1);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--sp-6);
    border-bottom: 1px solid var(--c-border);
}

.modal-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--c-dark);
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    color: var(--c-text-soft);
    font-size: 1.5rem;
    transition: background var(--duration-fast) var(--ease-standard);
}

.modal-close:hover {
    background: var(--c-bg);
    color: var(--c-dark);
}

.modal-body {
    padding: var(--sp-6);
    overflow-y: auto;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: var(--sp-3);
    padding: var(--sp-6);
    border-top: 1px solid var(--c-border);
}


/* ==========================================
   MOBILE MENU (Slide-in)
   ========================================== */
.mobile-menu {
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--c-surface);
    z-index: 1001;
    transform: translateX(100%);
    transition: transform var(--duration-base) var(--ease-standard);
    box-shadow: var(--shadow-xl);
}

.mobile-menu.active {
    transform: translateX(0);
}

.mobile-menu-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--sp-4) var(--sp-6);
    border-bottom: 1px solid var(--c-border);
}

.mobile-menu-nav {
    padding: var(--sp-6);
}

.mobile-menu-link {
    display: block;
    padding: var(--sp-4) 0;
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--c-dark);
    border-bottom: 1px solid var(--c-border);
    transition: color var(--duration-fast) var(--ease-standard);
}

.mobile-menu-link:hover {
    color: var(--c-primary);
}

.mobile-menu-cta {
    padding: var(--sp-6);
}


/* ==========================================
   TOAST / NOTIFICATION
   ========================================== */
.toast {
    position: fixed;
    bottom: var(--sp-6);
    right: var(--sp-6);
    padding: var(--sp-4) var(--sp-6);
    background: var(--c-dark);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1002;
    transform: translateY(100px);
    opacity: 0;
    transition: 
        transform var(--duration-base) var(--ease-out),
        opacity var(--duration-base) var(--ease-out);
}

.toast.active {
    transform: translateY(0);
    opacity: 1;
}

.toast-success {
    background: var(--c-success);
}

.toast-error {
    background: var(--c-error);
}


/* ==========================================
   SCROLL ANIMATIONS
   ========================================== */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: 
        opacity var(--duration-slow) var(--ease-out),
        transform var(--duration-slow) var(--ease-out);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger Delays */
.stagger > *:nth-child(1) { transition-delay: 0ms; }
.stagger > *:nth-child(2) { transition-delay: 50ms; }
.stagger > *:nth-child(3) { transition-delay: 100ms; }
.stagger > *:nth-child(4) { transition-delay: 150ms; }
.stagger > *:nth-child(5) { transition-delay: 200ms; }
.stagger > *:nth-child(6) { transition-delay: 250ms; }

@media (prefers-reduced-motion: reduce) {
    .fade-in {
        opacity: 1;
        transform: none;
        transition: none;
    }
}


/* ==========================================
   SCROLL TO TOP BUTTON
   ========================================== */
.scroll-top {
    position: fixed;
    bottom: var(--sp-6);
    right: var(--sp-6);
    width: 48px;
    height: 48px;
    background: var(--c-primary);
    color: white;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: 
        opacity var(--duration-base) var(--ease-standard),
        transform var(--duration-base) var(--ease-standard),
        visibility var(--duration-base) var(--ease-standard),
        background var(--duration-fast) var(--ease-standard);
    z-index: 99;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.scroll-top:hover {
    background: var(--c-primary-dark);
}