* {
    box-sizing: border-box;
}

:root {
    --bg: #f4f7fb;
    --card: #ffffff;
    --text: #0f172a;
    --muted: #64748b;
    --primary: #4f46e5;
    --primary-dark: #4338ca;
    --line: #e2e8f0;
}

body {
    margin: 0;
    font-family: Inter, Arial, sans-serif;
    background:
        radial-gradient(circle at top left, #e0e7ff 0%, transparent 28%),
        radial-gradient(circle at bottom right, #dbeafe 0%, transparent 26%),
        var(--bg);
    color: var(--text);
}

.accordion-section {
    padding: 80px 20px;
}

.accordion-container {
    max-width: 700px;
    margin: auto;
}

.accordion-header {
    text-align: center;
    margin-bottom: 40px;
}

.accordion-label {
    margin: 0 0 10px;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: .12em;
    color: var(--primary);
    font-weight: 700;
}

.accordion-title {
    margin: 0;
    font-size: 42px;
    font-weight: 900;
}

.accordion-subtitle {
    margin-top: 12px;
    color: var(--muted);
}

.accordion {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.accordion-item {
    background: var(--card);
    border-radius: 18px;
    border: 1px solid var(--line);
    overflow: hidden;
    box-shadow: 0 10px 20px rgba(15, 23, 42, .05);
    transition:
        transform 0.28s ease,
        box-shadow 0.28s ease,
        border-color 0.28s ease,
        background 0.28s ease;
}

.accordion-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 28px rgba(15, 23, 42, .08);
}

.accordion-item.active {
    border-color: rgba(79, 70, 229, 0.22);
    box-shadow: 0 18px 34px rgba(79, 70, 229, 0.14);
}

.accordion-trigger {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    padding: 20px 22px;
    border: none;
    background: none;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    transition:
        background 0.3s ease,
        color 0.3s ease,
        padding 0.25s ease;
}

.accordion-trigger:hover {
    background: #f8fafc;
}

.accordion-trigger span:first-child {
    text-align: left;
}

.accordion-item.active .accordion-trigger {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
}

.accordion-icon {
    width: 20px;
    height: 20px;
    position: relative;
    flex-shrink: 0;
    transition: transform 0.3s ease;
}

.accordion-icon::before,
.accordion-icon::after {
    content: "";
    position: absolute;
    background: var(--text);
    border-radius: 2px;
    transition:
        opacity 0.25s ease,
        transform 0.3s ease,
        background-color 0.3s ease;
}

.accordion-icon::before {
    width: 20px;
    height: 2px;
    top: 9px;
    left: 0;
}

.accordion-icon::after {
    width: 2px;
    height: 20px;
    left: 9px;
    top: 0;
}

.accordion-item.active .accordion-icon {
    transform: rotate(180deg);
}

.accordion-item.active .accordion-icon::before,
.accordion-item.active .accordion-icon::after {
    background-color: #fff;
}

.accordion-item.active .accordion-icon::after {
    opacity: 0;
    transform: scaleY(0.35);
}

.accordion-content {
    max-height: 0;
    overflow: hidden;
    padding: 0 22px;
    opacity: 0;
    transform: translateY(-8px);
    transition:
        max-height 0.38s ease,
        padding 0.3s ease,
        opacity 0.25s ease,
        transform 0.28s ease;
}

.accordion-item.active .accordion-content {
    max-height: 220px;
    padding: 18px 22px 22px;
    opacity: 1;
    transform: translateY(0);
}

.accordion-content p {
    margin: 0;
    color: var(--muted);
    line-height: 1.7;
    transition: color 0.25s ease;
}

.accordion-item.active .accordion-content p {
    animation: fadeSlideIn 0.32s ease;
}

@keyframes fadeSlideIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}