.header-icon {
    display: inline-block;
    vertical-align: middle;
}

.main-grid {
    display: grid;
    grid-template-columns: 390px 1fr 390px;
    gap: 24px;
    animation: fadeInUp 1s ease-out 0.3s backwards;
    position: relative;
    transition: grid-template-columns 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.main-grid.left-collapsed {
    grid-template-columns: 0 1fr 390px;
}

.main-grid.right-collapsed {
    grid-template-columns: 390px 1fr 0;
}

.main-grid.left-collapsed.right-collapsed {
    grid-template-columns: 0 1fr 0;
}

.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    padding: 15px;
    box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.4),
        inset 0 1px 0 rgba(212, 175, 55, 0.1);
    position: relative;
    overflow: hidden;
}

.glass-panel::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    opacity: 0.5;
}

.controls-panel {
    display: flex;
    flex-direction: column;
    gap: 22px;
    max-height: 800px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--gold) var(--black-light);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.section-card {
    padding: 18px;
    border-radius: 14px;
    border: 1px solid rgba(212, 175, 55, 0.18);
    background: rgba(0, 0, 0, 0.18);
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.28);
}

.left-section:not(.revealed) {
    opacity: 0;
    animation: fadeInLeft 0.6s ease-out forwards;
}

.left-section:nth-child(1) {
    animation-delay: 0.05s;
}

.left-section:nth-child(2) {
    animation-delay: 0.1s;
}

.left-section:nth-child(3) {
    animation-delay: 0.15s;
}

.left-section:nth-child(4) {
    animation-delay: 0.2s;
}

.left-section:nth-child(5) {
    animation-delay: 0.25s;
}

.left-section:nth-child(6) {
    animation-delay: 0.3s;
}

.left-section:nth-child(7) {
    animation-delay: 0.35s;
}

.left-section:nth-child(8) {
    animation-delay: 0.4s;
}

.controls-panel.collapsed {
    transform: translateX(-100%);
    opacity: 0;
    pointer-events: none;
}

.right-panel.collapsed {
    transform: translateX(100%);
    opacity: 0;
    pointer-events: none;
}

.controls-panel::-webkit-scrollbar {
    width: 8px;
}

.controls-panel::-webkit-scrollbar-track {
    background: var(--black-light);
    border-radius: 4px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--gold);
    border-radius: 4px;
}

.visualization-panel {
    min-height: 700px;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Collapse toggles - sleek edge-attached version */
.collapse-toggle {
    position: absolute;
    width: 16px;
    height: 64px;
    background: rgba(12, 12, 16, 0.4);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(212, 175, 55, 0.2);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.6;
}

.collapse-toggle-left {
    left: 390px;
    border-radius: 0 8px 8px 0;
    border-left: none;
}

.collapse-toggle-right {
    right: 390px;
    border-radius: 8px 0 0 8px;
    border-right: none;
}

.main-grid.left-collapsed .collapse-toggle-left {
    left: 0;
    background: rgba(12, 12, 16, 0.8);
    border: 1px solid rgba(212, 175, 55, 0.4);
    border-left: none;
    opacity: 0.8;
}

.main-grid.right-collapsed .collapse-toggle-right {
    right: 0;
    background: rgba(12, 12, 16, 0.8);
    border: 1px solid rgba(212, 175, 55, 0.4);
    border-right: none;
    opacity: 0.8;
}

.collapse-toggle:hover {
    background: rgba(20, 20, 24, 0.95);
    border-color: rgba(212, 175, 55, 0.8);
    box-shadow: 0 0 16px rgba(212, 175, 55, 0.3);
    width: 22px;
    opacity: 1;
}

.collapse-icon {
    color: rgba(212, 175, 55, 0.6);
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.collapse-icon svg {
    width: 14px;
    height: 14px;
}

.collapse-toggle:hover .collapse-icon {
    color: var(--gold-light);
}

.collapse-toggle-left.collapsed .collapse-icon {
    transform: rotate(180deg);
}

.collapse-toggle-right.collapsed .collapse-icon {
    transform: rotate(180deg);
}

.section-title {
    font-family: var(--font-display);
    color: var(--gold);
    font-size: 1em;
    font-weight: 600;
    letter-spacing: 1.2px;
    margin-bottom: 15px;
    padding-bottom: 8px;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding-bottom: 8px;
    margin-bottom: 12px;
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
    cursor: grab;
}

.section-header:active {
    cursor: grabbing;
}

.section-header .section-title {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

.section-header-actions {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.section-action-btn {
    width: 26px;
    height: 26px;
    padding: 0;
    border-radius: 8px;
    font-size: 1.1em;
    line-height: 1;
}

.section-toggle,
.section-icon-btn {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    border: 1px solid rgba(212, 175, 55, 0.3);
    background: rgba(0, 0, 0, 0.35);
    color: var(--gold-light);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9em;
    transition: all 0.25s ease;
    box-shadow: inset 0 1px 6px rgba(0, 0, 0, 0.35);
}

.section-toggle:hover,
.section-icon-btn:hover {
    border-color: var(--gold);
    box-shadow: 0 0 10px rgba(212, 175, 55, 0.25);
    transform: translateY(-1px);
}

.section-body {
    max-height: 3000px;
    overflow: hidden;
    opacity: 1;
    transition: max-height 0.35s ease, opacity 0.35s ease;
}

.section-card[data-section-id="gates"] .section-body {
    overflow: visible;
}

.section-card.collapsed .section-body {
    max-height: 0;
    opacity: 0;
    pointer-events: none;
}

.section-card.collapsed .section-toggle {
    transform: rotate(-90deg);
}

.section-card.draggable {
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1),
        box-shadow 0.3s cubic-bezier(0.2, 0.8, 0.2, 1),
        margin 0.3s cubic-bezier(0.2, 0.8, 0.2, 1),
        opacity 0.3s ease;
}

.section-card.dragging {
    opacity: 0.45;
    transform: scale(0.97) rotate(0.8deg);
    box-shadow: 0 15px 45px rgba(0, 0, 0, 0.6), 0 0 25px rgba(212, 175, 55, 0.15);
    border-color: rgba(212, 175, 55, 0.6) !important;
    cursor: grabbing;
    z-index: 1000;
    animation: none !important;
}

.section-card-placeholder {
    border: 2px dashed rgba(212, 175, 55, 0.3);
    background: rgba(212, 175, 55, 0.03);
    border-radius: 14px;
    margin-bottom: 20px;
    transition: height 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
}