:root {
    --primary-background: #FFFFFF;
    --primary-text: #1F2937;
    --secondary-background: #1E3A8A;
    --secondary-text: #F9FAFB;
    --accent-background: #3B82F6;
    --accent-text: #FFFFFF;
    --graphite-background: #374151;
    --graphite-text: #F3F4F6;
    --muted-text-light: #6B7280;
    --muted-text-dark: #9CA3AF;
    --font-family: 'Inter', sans-serif;
    --base-size: 16px;
    --border-radius: 0.5rem;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --transition: all 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    font-size: var(--base-size);
}

body {
    font-family: var(--font-family);
    background-color: var(--primary-background);
    color: var(--primary-text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

a,
a:hover,
a:focus {
    text-decoration: none;
    transition: var(--transition);
    color: inherit;
}

button {
    cursor: pointer;
    border: none;
    background: none;
    transition: var(--transition);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

ul,
ol {
    list-style: none;
}

input,
textarea,
select {
    font-family: inherit;
    font-size: 1rem;
}

@media (max-width: 768px) {
    h1 {
        font-size: clamp(1.75rem, 8vw, 2.5rem);
    }

    h2 {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    h3 {
        font-size: clamp(1.25rem, 5vw, 1.75rem);
    }

    body {
        font-size: 15px;
    }

    .mobile-break-word {
        overflow-wrap: break-word;
        word-wrap: break-word;
        hyphens: auto;
    }
}

@media (min-width: 1024px) {
    h1 {
        font-size: 3.5rem;
    }

    h2 {
        font-size: 2.5rem;
    }

    h3 {
        font-size: 1.75rem;
    }
}

/* ===== header_section ===== */
#header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.js-modal {
    backdrop-filter: blur(4px);
}

/* ===== hero_section ===== */
#hero {
    width: 100%;
    position: relative;
    overflow: hidden;
    padding: 100px 0;
}

.js-parallax-bg {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.1s ease-out;
}

/* ===== article_grid ===== */
.card {
    transition: transform 0.3s ease, shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.modal-box {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-background) transparent;
}

/* ===== analytical_deep_dive ===== */
.prose p {
    color: var(--graphite-text);
    margin-bottom: 1.5rem;
}

.prose {
    color: var(--graphite-text);
}

/* ===== strategy_benefits ===== */
#benefits {
    width: 100%;
    overflow: hidden;
}

.bi {
    line-height: 1;
}

/* ===== business_cases ===== */
#cases {
    width: 100%;
    position: relative;
    overflow: hidden;
}

.bi {
    color: inherit;
}

/* ===== strategy_checklist ===== */
#checklist {
    width: 100%;
}

#checklist .js-checklist-item {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

#checklist .js-checkbox {
    transition: background-color 0.2s ease;
}

/* ===== business_faq ===== */
.collapse-title::after {
    color: var(--accent-background) !important;
}

.collapse-arrow .collapse-title:after {
    top: 1.8rem;
}

/* ===== strategic_thinking_info ===== */
#info-block {
    width: 100%
}

.js-active {
    opacity: 1;
    transition: opacity 0.5s ease-in
}

/* ===== feedback_form ===== */
#contact .js-contact-form {
    width: 100%;
}

#contact .js-input-field:focus {
    outline: 2px solid var(--accent-background);
    border-color: transparent;
}

#contact .js-input-field::placeholder {
    color: var(--muted-text-light);
}

#contact .checkbox:checked {
    background-color: var(--accent-background);
    border-color: var(--accent-background);
}

/* ===== footer ===== */
#footer {
    width: 100%
}

.modal-box p{
    color: #000 !important;
}