/* ===========================
   ROOT & VARIABLES
=========================== */
:root {
    --bu-dark: #0F172A;
    --bu-dark-2: #1E293B;
    --bu-gray-900: #1A1A2E;
    --bu-gray-700: #374151;
    --bu-gray-500: #64748B;
    --bu-gray-400: #94A3B8;
    --bu-gray-200: #E2E8F0;
    --bu-gray-100: #F1F5F9;
    --bu-gray-50: #F8FAFC;
    --bu-white: #FFFFFF;
    /* Primary — LMS indigo */
    --bu-indigo: #6366F1;
    --bu-indigo-light: #EEF2FF;
    --bu-indigo-mid: #818CF8;
    --bu-indigo-dark: #4338CA;
    --bu-indigo-900: #312E81;
    /* Aliases (teal → indigo, keeps HTML working) */
    --bu-teal: #6366F1;
    --bu-teal-light: #EEF2FF;
    --bu-teal-mid: #818CF8;
    --bu-teal-dark: #4338CA;
    --bu-blue: #3B82F6;
    --bu-blue-light: #EFF6FF;
    --bu-blue-mid: #60A5FA;
    --bu-blue-dark: #1D4ED8;
    --bu-purple: #7C3AED;
    --bu-purple-light: #F5F3FF;
    --bu-purple-mid: #A78BFA;
    --bu-purple-dark: #5B21B6;
    /* Functional */
    --bu-success: #16A34A;
    --bu-warning: #854F0B;
    --bu-danger: #A32D2D;
    /* Spacing & Radius */
    --bu-radius: 8px;
    --bu-radius-lg: 12px;
    --bu-radius-xl: 16px;
    --bu-radius-pill: 100px;
    /* Shadows — minimal */
    --bu-shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --bu-shadow: 0 2px 8px rgba(0,0,0,0.06);
    --bu-shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
    /* Transitions */
    --bu-transition: 0.2s ease;
}

/* ===========================
   RESET & GLOBAL
=========================== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--bu-dark);
    background: var(--bu-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    letter-spacing: -0.02em;
    color: var(--bu-dark);
}

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

/* ===========================
   NAVBAR
=========================== */
.bu-navbar {
    background: var(--bu-indigo);
    border-bottom: none;
    padding: 12px 0;
    transition: all var(--bu-transition);
}

    .bu-navbar.scrolled {
        box-shadow: 0 2px 12px rgba(99,102,241,0.25);
    }

    .bu-navbar .nav-link {
        color: rgba(255,255,255,0.7) !important;
        font-size: 0.875rem;
        font-weight: 500;
        padding: 6px 12px !important;
        border-radius: var(--bu-radius);
        transition: all var(--bu-transition);
    }

        .bu-navbar .nav-link:hover,
        .bu-navbar .nav-link.active {
            color: #fff !important;
            background: rgba(255,255,255,0.12);
        }

.brand-icon {
    background: rgba(255,255,255,0.2);
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    width: 34px;
    height: 34px;
    border-radius: var(--bu-radius);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    letter-spacing: -0.5px;
}

.brand-text {
    color: #fff;
    font-size: 1rem;
    font-weight: 600;
}

.bu-navbar .navbar-toggler {
    border-color: rgba(255,255,255,0.25);
    padding: 4px 8px;
}

.bu-navbar .navbar-toggler-icon {
    filter: invert(1);
}

/* ===========================
   NAVBAR DROPDOWN
=========================== */
.bu-navbar .bu-dropdown-toggle::after {
    display: inline-block;
    margin-left: 4px;
    vertical-align: 2px;
    content: "";
    border-top: 4px solid rgba(255,255,255,0.7);
    border-right: 4px solid transparent;
    border-left: 4px solid transparent;
    border-bottom: 0;
    transition: transform var(--bu-transition);
}
.bu-navbar .bu-dropdown-toggle[aria-expanded="true"]::after {
    transform: rotate(180deg);
    border-top-color: #fff;
}
.bu-navbar .bu-dropdown-toggle[aria-expanded="true"] {
    color: #fff !important;
    background: rgba(255,255,255,0.12);
}

.bu-dropdown-menu {
    min-width: 300px;
    padding: 8px;
    margin-top: 8px;
    background: #fff;
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    box-shadow: 0 8px 32px rgba(0,0,0,0.12), 0 2px 8px rgba(0,0,0,0.06);
}

.bu-dropdown-section-label {
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--bu-gray-400);
    padding: 4px 10px 6px;
    display: block;
}

.bu-dropdown-divider {
    border-color: var(--bu-gray-200);
    margin: 6px 4px;
}

.bu-dropdown-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 10px;
    border-radius: var(--bu-radius);
    color: var(--bu-dark) !important;
    text-decoration: none;
    transition: background var(--bu-transition);
}
.bu-dropdown-item:hover {
    background: var(--bu-gray-50);
    color: var(--bu-dark) !important;
}

.bu-dd-icon {
    width: 34px;
    height: 34px;
    border-radius: var(--bu-radius);
    background: var(--bu-indigo-light);
    color: var(--bu-indigo);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
}
.bu-dd-icon--accent {
    background: #FEF3C7;
    color: #D97706;
}
.bu-dd-icon--ai {
    background: #F0FDF4;
    color: #16A34A;
}

.bu-dd-text {
    display: flex;
    flex-direction: column;
    gap: 1px;
    flex: 1;
}
.bu-dd-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--bu-dark);
    line-height: 1.3;
}
.bu-dd-sub {
    font-size: 0.7rem;
    color: var(--bu-gray-500);
    line-height: 1.3;
}

.bu-dd-badge {
    font-size: 0.6rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--bu-indigo-light);
    color: var(--bu-indigo-dark);
    padding: 2px 7px;
    border-radius: var(--bu-radius-pill);
    flex-shrink: 0;
}

/* Mobil dropdown */
@media (max-width: 991.98px) {
    .bu-dropdown-menu {
        min-width: 100%;
        box-shadow: none;
        border: none;
        background: rgba(255,255,255,0.08);
        padding: 4px 0;
        margin-top: 4px;
    }
    .bu-dropdown-section-label {
        color: rgba(255,255,255,0.45);
    }
    .bu-dropdown-divider {
        border-color: rgba(255,255,255,0.12);
    }
    .bu-dropdown-item {
        color: rgba(255,255,255,0.8) !important;
    }
    .bu-dropdown-item:hover {
        background: rgba(255,255,255,0.1);
        color: #fff !important;
    }
    .bu-dd-title { color: rgba(255,255,255,0.9); }
    .bu-dd-sub   { color: rgba(255,255,255,0.5); }
    .bu-dd-icon  { background: rgba(255,255,255,0.1); color: rgba(255,255,255,0.8); }
    .bu-dd-icon--accent { background: rgba(251,191,36,0.15); color: #FCD34D; }
    .bu-dd-icon--ai     { background: rgba(34,197,94,0.15);  color: #86EFAC; }
    .bu-dd-badge { background: rgba(255,255,255,0.15); color: rgba(255,255,255,0.8); }
}

/* ===========================
   BUTTONS
=========================== */
.btn-primary {
    background: var(--bu-indigo);
    border: 1px solid var(--bu-indigo);
    border-radius: var(--bu-radius);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 10px 22px;
    color: var(--bu-white);
    transition: all var(--bu-transition);
}

    .btn-primary:hover {
        background: var(--bu-indigo-dark);
        border-color: var(--bu-indigo-dark);
        color: var(--bu-white);
        transform: translateY(-1px);
        box-shadow: 0 4px 12px rgba(99,102,241,0.3);
    }

.btn-outline-primary {
    border: 1px solid var(--bu-gray-200);
    color: var(--bu-dark);
    border-radius: var(--bu-radius);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 10px 22px;
    background: var(--bu-white);
    transition: all var(--bu-transition);
}

    .btn-outline-primary:hover {
        background: var(--bu-gray-50);
        border-color: var(--bu-gray-400);
        color: var(--bu-dark);
        transform: translateY(-1px);
    }

.btn-outline-dark {
    border: 1px solid var(--bu-gray-200);
    color: var(--bu-dark);
    border-radius: var(--bu-radius);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 10px 22px;
    background: var(--bu-white);
    transition: all var(--bu-transition);
}

    .btn-outline-dark:hover {
        background: var(--bu-dark);
        color: var(--bu-white);
        border-color: var(--bu-dark);
        transform: translateY(-1px);
    }

.btn-outline-light {
    border: 1px solid rgba(255,255,255,0.25);
    color: var(--bu-white);
    border-radius: var(--bu-radius);
    font-weight: 500;
    font-size: 0.875rem;
    padding: 10px 22px;
    background: rgba(255,255,255,0.08);
    transition: all var(--bu-transition);
}

    .btn-outline-light:hover {
        background: rgba(255,255,255,0.15);
        border-color: rgba(255,255,255,0.4);
        color: var(--bu-white);
    }

.btn-light {
    background: var(--bu-white);
    color: var(--bu-dark);
    border: none;
    border-radius: var(--bu-radius);
    font-weight: 600;
    padding: 10px 22px;
    transition: all var(--bu-transition);
}

    .btn-light:hover {
        background: var(--bu-gray-50);
        color: var(--bu-dark);
        transform: translateY(-1px);
        box-shadow: var(--bu-shadow);
    }

.btn-success {
    background: #22C55E;
    border: none;
    border-radius: var(--bu-radius);
    font-weight: 500;
    color: var(--bu-white);
    transition: all var(--bu-transition);
}

    .btn-success:hover {
        background: #16A34A;
        transform: translateY(-1px);
    }

/* ===========================
   SECTIONS
=========================== */
section {
    padding: 80px 0;
}

.section-badge {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: var(--bu-radius-pill);
    margin-bottom: 16px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    background: var(--bu-teal-light);
    color: var(--bu-teal-dark);
}

.section-badge-light {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 14px;
    border-radius: var(--bu-radius-pill);
    margin-bottom: 16px;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    background: rgba(255,255,255,0.12);
    color: rgba(255,255,255,0.8);
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.4rem);
    font-weight: 700;
    color: var(--bu-dark);
    margin-bottom: 14px;
    letter-spacing: -0.025em;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--bu-gray-500);
    max-width: 540px;
    line-height: 1.7;
}

.text-gradient {
    color: var(--bu-teal);
    background: none;
    -webkit-text-fill-color: var(--bu-teal);
}

/* ===========================
   CARDS — BASE
=========================== */
.bu-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 24px;
    transition: all var(--bu-transition);
    height: 100%;
}

    .bu-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
        border-color: var(--bu-gray-400);
    }

.bu-icon-box {
    width: 48px;
    height: 48px;
    border-radius: var(--bu-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 14px;
    flex-shrink: 0;
    background: var(--bu-teal-light);
    color: var(--bu-teal);
}

/* ===========================
   MOCKUP FRAME
=========================== */
.mockup-frame {
    background: var(--bu-gray-50);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 8px;
    transition: all var(--bu-transition);
}

    .mockup-frame:hover {
        box-shadow: var(--bu-shadow-lg);
    }

.mockup-bar {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-bottom: 8px;
    padding: 4px 8px;
}

.mockup-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--bu-gray-200);
}

.mockup-frame img {
    width: 100%;
    border-radius: var(--bu-radius-lg);
    display: block;
}

.mockup-placeholder {
    height: 300px;
    background: var(--bu-gray-100);
    border-radius: var(--bu-radius-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    color: var(--bu-gray-400);
}

    .mockup-placeholder i {
        font-size: 2.5rem;
    }

    .mockup-placeholder span {
        font-size: 0.825rem;
    }

/* ===========================
   HERO — HOME
=========================== */
.hero-section {
    padding: 100px 0 80px;
    background: var(--bu-white);
    position: relative;
}

.hero-title {
    font-size: clamp(2rem, 4.5vw, 3rem);
    font-weight: 700;
    line-height: 1.15;
    margin-bottom: 18px;
    letter-spacing: -0.03em;
    color: var(--bu-dark);
}

.hero-subtitle {
    font-size: 1.05rem;
    color: var(--bu-gray-500);
    line-height: 1.75;
    max-width: 480px;
}

.hero-stats {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    gap: 20px;
    margin-top: 36px;
    background: var(--bu-gray-50);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 16px 22px;
    width: fit-content;
}

.hero-stat {
    display: flex;
    flex-direction: column;
}

.hero-stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--bu-dark);
    line-height: 1;
}

.hero-stat-label {
    font-size: 0.75rem;
    color: var(--bu-gray-500);
    margin-top: 4px;
    font-weight: 500;
}

.hero-stat-divider {
    width: 1px;
    height: 32px;
    background: var(--bu-gray-200);
}

/* ===========================
   PAGE HEROES
=========================== */
.page-hero,
.catalog-hero,
.platform-hero,
.schools-hero {
    padding: 100px 0 60px;
    background: var(--bu-white);
    border-bottom: 1px solid var(--bu-gray-200);
}

/* ===========================
   PANEL OVERVIEW — PLATFORM
=========================== */
.panel-overview {
    padding: 0 0 20px;
    margin-top: -30px;
    position: relative;
    z-index: 2;
}

.panel-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 28px 20px;
    text-decoration: none;
    color: var(--bu-dark);
    transition: all var(--bu-transition);
    height: 100%;
}

    .panel-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
        border-color: var(--bu-gray-400);
        color: var(--bu-dark);
    }

    .panel-card:nth-child(1) {
        border-top: 3px solid var(--bu-teal);
    }

    .panel-card:nth-child(2) {
        border-top: 3px solid var(--bu-blue);
    }

    .panel-card:nth-child(3) {
        border-top: 3px solid var(--bu-purple);
    }

.panel-card-icon {
    width: 52px;
    height: 52px;
    border-radius: var(--bu-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 14px;
    font-size: 1.5rem;
}

.panel-card:nth-child(1) .panel-card-icon {
    background: var(--bu-teal-light);
    color: var(--bu-teal);
}

.panel-card:nth-child(2) .panel-card-icon {
    background: var(--bu-blue-light);
    color: var(--bu-blue);
}

.panel-card:nth-child(3) .panel-card-icon {
    background: var(--bu-purple-light);
    color: var(--bu-purple);
}

.panel-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.panel-card p {
    font-size: 0.85rem;
    color: var(--bu-gray-500);
    margin: 0;
    line-height: 1.5;
}

/* ===========================
   STEP CARDS
=========================== */
.step-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 24px;
    position: relative;
    height: 100%;
    transition: all var(--bu-transition);
}

    .step-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
        border-color: var(--bu-gray-400);
    }

.step-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--bu-gray-100);
    line-height: 1;
    position: absolute;
    top: 12px;
    right: 16px;
}

.step-card h5 {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 6px;
}

.step-card p {
    font-size: 0.85rem;
    color: var(--bu-gray-500);
    margin: 0;
}

/* ===========================
   BADGE — LESSON
=========================== */
.badge-lesson {
    font-size: 0.75rem;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: var(--bu-radius-pill);
    display: inline-flex;
    align-items: center;
    background: var(--bu-teal-light);
    color: var(--bu-teal-dark);
}

/* ===========================
   FEATURE CARD — DARK
=========================== */
.feature-card-dark {
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: var(--bu-radius-lg);
    padding: 24px;
    height: 100%;
    transition: all var(--bu-transition);
}

    .feature-card-dark:hover {
        background: rgba(255,255,255,0.07);
        border-color: rgba(255,255,255,0.2);
        transform: translateY(-4px);
    }

    .feature-card-dark h5 {
        font-size: 0.95rem;
        font-weight: 600;
        margin: 12px 0 6px;
        color: var(--bu-white);
    }

    .feature-card-dark p {
        font-size: 0.85rem;
        color: rgba(255,255,255,0.5);
        margin: 0;
    }

.feature-icon-dark {
    font-size: 2rem;
    color: var(--bu-teal-mid);
}

/* ===========================
   REFERENCES
=========================== */
.reference-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 80px;
    transition: all var(--bu-transition);
}

    .reference-card:hover {
        border-color: var(--bu-gray-400);
        transform: translateY(-2px);
        box-shadow: var(--bu-shadow);
    }

    .reference-card img {
        max-height: 44px;
        max-width: 100%;
        object-fit: contain;
        filter: grayscale(100%);
        opacity: 0.45;
        transition: all var(--bu-transition);
    }

    .reference-card:hover img {
        filter: grayscale(0%);
        opacity: 1;
    }

.ref-placeholder {
    font-size: 0.825rem;
    font-weight: 600;
    color: var(--bu-gray-400);
    text-align: center;
}

/* ===========================
   TESTIMONIALS
=========================== */
.testimonial-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 24px;
    height: 100%;
    transition: all var(--bu-transition);
}

    .testimonial-card:hover {
        border-color: var(--bu-gray-400);
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
    }

.testimonial-quote i {
    font-size: 2rem;
    color: var(--bu-gray-200);
}

.testimonial-text {
    font-size: 0.9rem;
    color: var(--bu-gray-500);
    line-height: 1.75;
    margin: 12px 0 18px;
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: 10px;
}

.testimonial-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--bu-dark);
    color: var(--bu-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.testimonial-name {
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--bu-dark);
}

.testimonial-school {
    font-size: 0.78rem;
    color: var(--bu-gray-500);
}

/* ===========================
   CTA BOX
=========================== */
.cta-section {
    padding: 80px 0;
}

.cta-box {
    background: var(--bu-dark);
    border-radius: var(--bu-radius-xl);
    padding: 48px 52px;
    position: relative;
    overflow: hidden;
}

    .cta-box::before {
        content: '';
        position: absolute;
        width: 300px;
        height: 300px;
        background: rgba(255,255,255,0.03);
        border-radius: 50%;
        top: -100px;
        right: -50px;
        pointer-events: none;
    }

/* ===========================
   COMING SOON
=========================== */
.coming-soon-box {
    background: var(--bu-dark);
    border-radius: var(--bu-radius-xl);
    padding: 44px 48px;
    position: relative;
    overflow: hidden;
}

/* ===========================
   FEATURE LIST
=========================== */
.feature-list {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

    .feature-list li {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.9rem;
        color: var(--bu-dark);
        background: var(--bu-gray-50);
        border: 1px solid var(--bu-gray-200);
        border-radius: var(--bu-radius);
        padding: 10px 14px;
    }

        .feature-list li i {
            font-size: 1.2rem;
            color: var(--bu-teal);
            flex-shrink: 0;
        }

/* ===========================
   PROCESS STEPS
=========================== */
.process-step {
    text-align: center;
    padding: 0 14px;
    position: relative;
}

.process-icon {
    width: 56px;
    height: 56px;
    background: var(--bu-dark);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 14px;
    font-size: 1.5rem;
    color: var(--bu-white);
    position: relative;
    z-index: 1;
}

.process-connector {
    position: absolute;
    top: 28px;
    left: calc(50% + 28px);
    right: calc(-50% + 28px);
    height: 1px;
    background: var(--bu-gray-200);
    z-index: 0;
}

.process-step.last .process-connector {
    display: none;
}

.process-step h6 {
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.process-step p {
    font-size: 0.8rem;
    color: var(--bu-gray-500);
    margin: 0;
}

/* ===========================
   DEMO FORM
=========================== */
.demo-form-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 44px;
    box-shadow: var(--bu-shadow-lg);
}

.bu-input {
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius);
    padding: 10px 14px;
    font-size: 0.875rem;
    transition: all var(--bu-transition);
    background: var(--bu-white);
}

    .bu-input:focus {
        border-color: var(--bu-dark);
        box-shadow: 0 0 0 3px rgba(15,23,42,0.08);
        background: var(--bu-white);
        outline: none;
    }

/* ===========================
   WHATSAPP BOX
=========================== */
.whatsapp-box {
    background: var(--bu-teal-light);
    border: 1px solid #BBF7D0;
    border-radius: var(--bu-radius-xl);
    padding: 28px 36px;
}

.whatsapp-icon {
    width: 52px;
    height: 52px;
    background: #22C55E;
    border-radius: var(--bu-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.8rem;
    color: var(--bu-white);
    flex-shrink: 0;
}

/* ===========================
   LEVEL CARDS
=========================== */
.level-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 24px;
    height: 100%;
    border-top: 3px solid transparent;
    transition: all var(--bu-transition);
}

    .level-card:hover {
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
    }

.level-primary {
    border-top-color: var(--bu-teal);
}

.level-middle {
    border-top-color: var(--bu-blue);
}

.level-high {
    border-top-color: var(--bu-purple);
}

.level-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--bu-radius-pill);
    margin-bottom: 10px;
    background: var(--bu-gray-100);
    color: var(--bu-gray-500);
}

.level-card h5 {
    font-weight: 600;
    margin-bottom: 6px;
}

.level-card p {
    font-size: 0.85rem;
    color: var(--bu-gray-500);
    margin-bottom: 14px;
}

.level-features {
    padding-left: 16px;
    margin: 0;
}

    .level-features li {
        font-size: 0.8rem;
        color: var(--bu-gray-500);
        margin-bottom: 5px;
    }

/* ===========================
   CATALOG CARDS
=========================== */
.catalog-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 28px;
    height: 100%;
    display: flex;
    flex-direction: column;
    transition: all var(--bu-transition);
}

    .catalog-card:hover {
        border-color: var(--bu-gray-400);
        box-shadow: var(--bu-shadow-lg);
        transform: translateY(-4px);
    }

.catalog-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    margin-bottom: 14px;
}

.catalog-card-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.catalog-card-desc {
    font-size: 0.875rem;
    color: var(--bu-gray-500);
    line-height: 1.65;
    flex: 1;
    margin-bottom: 20px;
}

.catalog-card-footer {
    margin-top: auto;
}

/* ===========================
   DETAIL PAGE
=========================== */
.back-link {
    color: var(--bu-gray-500);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: color var(--bu-transition);
}

    .back-link:hover {
        color: var(--bu-dark);
    }

.content-detail-box {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 32px;
}

.detail-feature {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    padding: 8px 12px;
    background: var(--bu-gray-50);
    border-radius: var(--bu-radius);
    border: 1px solid var(--bu-gray-200);
}

    .detail-feature i {
        color: var(--bu-teal);
        font-size: 1.1rem;
        flex-shrink: 0;
    }

.detail-sidebar {
    background: var(--bu-gray-50);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 24px;
}

    .detail-sidebar h6 {
        font-weight: 600;
        color: var(--bu-dark);
    }

.detail-info-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border-bottom: 1px solid var(--bu-gray-200);
    font-size: 0.85rem;
}

    .detail-info-row:last-of-type {
        border-bottom: none;
    }

    .detail-info-row .label {
        color: var(--bu-gray-500);
    }

    .detail-info-row .value {
        font-weight: 600;
        color: var(--bu-dark);
    }

/* ===========================
   MISSION / ABOUT
=========================== */
.mission-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 32px;
    height: 100%;
}

    .mission-card h3 {
        font-size: 1.2rem;
        font-weight: 700;
        margin: 14px 0 10px;
    }

    .mission-card p {
        color: var(--bu-gray-500);
        line-height: 1.75;
        margin: 0;
    }

.value-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    padding: 22px;
    height: 100%;
    transition: all var(--bu-transition);
}

    .value-card:hover {
        border-color: var(--bu-gray-400);
        transform: translateY(-4px);
        box-shadow: var(--bu-shadow-lg);
    }

    .value-card i {
        font-size: 1.8rem;
        color: var(--bu-teal);
        margin-bottom: 10px;
        display: block;
    }

    .value-card h6 {
        font-weight: 600;
        margin-bottom: 6px;
    }

    .value-card p {
        font-size: 0.825rem;
        color: var(--bu-gray-500);
        margin: 0;
        line-height: 1.55;
    }

.stats-row {
    background: var(--bu-dark);
    border-radius: var(--bu-radius-xl);
    padding: 48px;
    display: flex;
    align-items: center;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 24px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--bu-white);
    line-height: 1;
}

.stat-label {
    font-size: 0.825rem;
    color: rgba(255,255,255,0.55);
    margin-top: 6px;
    font-weight: 500;
}

.stat-divider {
    width: 1px;
    height: 50px;
    background: rgba(255,255,255,0.12);
}

/* ===========================
   BLOG
=========================== */
.blog-card-link {
    text-decoration: none;
    color: inherit;
    display: block;
    height: 100%;
}

.blog-card {
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    overflow: hidden;
    height: 100%;
    transition: all var(--bu-transition);
    display: flex;
    flex-direction: column;
}

    .blog-card:hover {
        border-color: var(--bu-gray-400);
        box-shadow: var(--bu-shadow-lg);
        transform: translateY(-4px);
    }

.blog-card-img {
    height: 190px;
    overflow: hidden;
}

    .blog-card-img img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        transition: transform 0.35s;
    }

.blog-card:hover .blog-card-img img {
    transform: scale(1.04);
}

.blog-card-img-placeholder {
    background: var(--bu-gray-50);
    display: flex;
    align-items: center;
    justify-content: center;
}

    .blog-card-img-placeholder i {
        font-size: 2.5rem;
        color: var(--bu-gray-400);
        opacity: 0.4;
    }

.blog-card-body {
    padding: 22px;
    display: flex;
    flex-direction: column;
    flex: 1;
}

.blog-date {
    font-size: 0.78rem;
    color: var(--bu-gray-400);
    margin-bottom: 8px;
    display: block;
}

.blog-title {
    font-size: 1rem;
    font-weight: 600;
    line-height: 1.4;
    margin-bottom: 8px;
    color: var(--bu-dark);
}

.blog-summary {
    font-size: 0.85rem;
    color: var(--bu-gray-500);
    line-height: 1.6;
    flex: 1;
    margin-bottom: 14px;
}

.blog-read-more {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--bu-teal);
    display: inline-flex;
    align-items: center;
}

.blog-detail-cover {
    width: 100%;
    border-radius: var(--bu-radius-xl);
    max-height: 400px;
    object-fit: cover;
}

.blog-content {
    font-size: 1rem;
    line-height: 1.85;
    color: var(--bu-dark);
}

    .blog-content h2, .blog-content h3 {
        margin-top: 1.75rem;
        margin-bottom: 0.75rem;
    }

    .blog-content p {
        margin-bottom: 1.15rem;
    }

    .blog-content img {
        max-width: 100%;
        border-radius: var(--bu-radius-lg);
        margin: 1.25rem 0;
    }

.blog-meta {
    display: flex;
    align-items: center;
    gap: 14px;
    flex-wrap: wrap;
}

/* ===========================
   CONTACT
=========================== */
.contact-info-card {
    background: var(--bu-gray-50);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 28px;
    height: 100%;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 22px;
}

.contact-info-icon {
    width: 42px;
    height: 42px;
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    color: var(--bu-gray-500);
}

    .contact-info-icon.whatsapp {
        background: var(--bu-teal-light);
        color: #22C55E;
        border-color: #BBF7D0;
    }

.contact-info-label {
    font-size: 0.72rem;
    color: var(--bu-gray-400);
    margin-bottom: 2px;
    font-weight: 500;
}

.contact-info-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--bu-dark);
    text-decoration: none;
    transition: color var(--bu-transition);
}

    .contact-info-value:hover {
        color: var(--bu-teal);
    }

/* ===========================
   FOOTER
=========================== */
.bu-footer {
    background: var(--bu-gray-50);
    border-top: 1px solid var(--bu-gray-200);
}

.footer-heading {
    color: var(--bu-dark);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 14px;
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

    .footer-links li {
        margin-bottom: 8px;
        font-size: 0.85rem;
        color: var(--bu-gray-500);
    }

    .footer-links a {
        color: var(--bu-gray-500);
        text-decoration: none;
        transition: color var(--bu-transition);
    }

        .footer-links a:hover {
            color: var(--bu-dark);
        }

.footer-social {
    color: var(--bu-gray-400);
    font-size: 1.4rem;
    text-decoration: none;
    transition: all var(--bu-transition);
    width: 36px;
    height: 36px;
    border-radius: var(--bu-radius);
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

    .footer-social:hover {
        background: var(--bu-indigo);
        border-color: var(--bu-indigo);
        color: #fff;
        transform: translateY(-2px);
    }

.footer-bottom {
    border-top: 1px solid var(--bu-gray-200);
    padding: 18px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* ===========================
   UTILITIES
=========================== */
.fw-600 {
    font-weight: 600;
}

.fw-700 {
    font-weight: 700;
}

.fw-800 {
    font-weight: 700;
}

.bg-light {
    background: var(--bu-gray-50) !important;
}

.bg-dark {
    background: var(--bu-dark) !important;
}

/* ===========================
   HOME — MOCKUP STACK
=========================== */
.hms-stack {
    position: relative;
    height: 430px;
}

.hms-card {
    position: absolute;
    background: var(--bu-white);
    border-radius: var(--bu-radius-lg);
    padding: 16px;
    border: 1px solid var(--bu-gray-200);
}

.hms-back {
    width: 210px;
    right: 0;
    top: 40px;
    transform: rotate(4deg);
    opacity: .7;
    z-index: 1;
}

.hms-mid {
    width: 240px;
    right: 50px;
    top: 110px;
    transform: rotate(-2deg);
    z-index: 2;
}

.hms-front {
    width: 275px;
    left: 0;
    top: 10px;
    transform: rotate(0.5deg);
    z-index: 3;
    box-shadow: var(--bu-shadow-lg);
}

.hms-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.hms-lbl {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--bu-gray-500);
    text-transform: uppercase;
    letter-spacing: .5px;
}

.hms-tag {
    font-size: 0.6rem;
    font-weight: 600;
    padding: 2px 7px;
    border-radius: var(--bu-radius-pill);
}

.hms-tag-green {
    background: var(--bu-teal-light);
    color: var(--bu-teal-dark);
}

.hms-tag-orange {
    background: #FEF3C7;
    color: #92400E;
}

.hms-dots {
    display: flex;
    gap: 4px;
}

    .hms-dots span {
        width: 7px;
        height: 7px;
        border-radius: 50%;
        display: inline-block;
    }

.hms-bars {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.hms-bar-row {
    display: flex;
    align-items: center;
    gap: 6px;
}

.hms-bar-nm {
    font-size: 0.65rem;
    color: var(--bu-gray-500);
    width: 24px;
    flex-shrink: 0;
}

.hms-bar-bg {
    flex: 1;
    background: var(--bu-gray-100);
    border-radius: var(--bu-radius-pill);
    height: 4px;
}

.hms-bar-fg {
    height: 4px;
    border-radius: var(--bu-radius-pill);
    background: var(--bu-dark);
}

.hms-bar-pc {
    font-size: 0.65rem;
    font-weight: 600;
    color: var(--bu-dark);
    width: 26px;
    text-align: right;
    flex-shrink: 0;
}

.hms-q {
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--bu-dark);
    margin-bottom: 8px;
    line-height: 1.5;
}

.hms-opts {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.hms-opt {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.67rem;
    color: var(--bu-gray-500);
    background: var(--bu-gray-50);
    border-radius: var(--bu-radius);
    padding: 5px 8px;
    border: 1px solid var(--bu-gray-200);
}

    .hms-opt span {
        font-weight: 600;
        color: var(--bu-teal);
    }

.hms-opt-ok {
    background: var(--bu-teal-light);
    border-color: #BBF7D0;
    color: var(--bu-teal-dark);
}

    .hms-opt-ok span {
        color: var(--bu-teal);
    }

.hms-timer-bg {
    margin-top: 8px;
    background: var(--bu-gray-100);
    border-radius: var(--bu-radius-pill);
    height: 3px;
}

.hms-timer-fg {
    width: 55%;
    height: 3px;
    border-radius: var(--bu-radius-pill);
    background: var(--bu-dark);
}

.hms-editor {
    background: var(--bu-dark);
    border-radius: var(--bu-radius);
    padding: 8px;
    margin-bottom: 8px;
}

.hms-line {
    display: flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 3px;
    font-size: 0.67rem;
    font-family: 'Courier New', monospace;
}

.hms-ln {
    color: #475569;
    width: 12px;
    flex-shrink: 0;
}

.hms-kw {
    color: #93C5FD;
}

.hms-vr {
    color: #C4B5FD;
}

.hms-st {
    color: #86EFAC;
}

.hms-fn {
    color: #FCA5A5;
}

.hms-op {
    color: #94A3B8;
}

.hms-out {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.hms-out-lbl {
    font-size: 0.6rem;
    font-weight: 600;
    color: var(--bu-gray-500);
    text-transform: uppercase;
    letter-spacing: .5px;
}

.hms-out-val {
    font-size: 0.67rem;
    font-family: 'Courier New', monospace;
    color: var(--bu-teal);
    font-weight: 600;
}

.hms-run {
    background: var(--bu-dark);
    color: var(--bu-white);
    border-radius: var(--bu-radius);
    padding: 6px;
    font-size: 0.72rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    cursor: pointer;
}

/* ===========================
   HOME — KATEGORİ KARTLARI
=========================== */
.home-cat-card {
    display: block;
    background: var(--bu-white);
    border: 1px solid var(--bu-gray-200);
    border-radius: var(--bu-radius-xl);
    padding: 24px 22px;
    height: 100%;
    text-decoration: none;
    color: var(--bu-dark);
    transition: all var(--bu-transition);
    border-top: 3px solid transparent;
}

    .home-cat-card:hover {
        border-color: var(--bu-gray-400);
        box-shadow: var(--bu-shadow-lg);
        transform: translateY(-4px);
        color: var(--bu-dark);
    }

    .home-cat-card h5 {
        font-size: 0.95rem;
        font-weight: 600;
        margin: 10px 0 5px;
    }

    .home-cat-card p {
        font-size: 0.825rem;
        color: var(--bu-gray-500);
        line-height: 1.55;
        margin: 0;
    }

.home-cat-count {
    display: inline-block;
    margin-top: 12px;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 3px 10px;
    border-radius: var(--bu-radius-pill);
    background: var(--bu-gray-100);
    color: var(--bu-gray-500);
}
.cat-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 12px;
    font-size: 22px;
}

.home-cat-card--1 {
    border-top-color: #6366F1;
}

    .home-cat-card--1 .cat-icon-wrap {
        background: #EEF2FF;
        color: #4338CA;
    }

.home-cat-card--2 {
    border-top-color: #F59E0B;
}

    .home-cat-card--2 .cat-icon-wrap {
        background: #FEF3C7;
        color: #B45309;
    }

.home-cat-card--3 {
    border-top-color: #10B981;
}

    .home-cat-card--3 .cat-icon-wrap {
        background: #D1FAE5;
        color: #065F46;
    }

.home-cat-card--4 {
    border-top-color: #3B82F6;
}

    .home-cat-card--4 .cat-icon-wrap {
        background: #DBEAFE;
        color: #1D4ED8;
    }

.home-cat-card--5 {
    border-top-color: #EC4899;
}

    .home-cat-card--5 .cat-icon-wrap {
        background: #FCE7F3;
        color: #9D174D;
    }

.home-cat-card--6 {
    border-top-color: #8B5CF6;
}

    .home-cat-card--6 .cat-icon-wrap {
        background: #F5F3FF;
        color: #5B21B6;
    }

.home-cat-card--7 {
    border-top-color: #EF4444;
}

    .home-cat-card--7 .cat-icon-wrap {
        background: #FEE2E2;
        color: #991B1B;
    }

.home-cat-card--8 {
    border-top-color: #14B8A6;
}

    .home-cat-card--8 .cat-icon-wrap {
        background: #CCFBF1;
        color: #0F766E;
    }

/* ===========================
   RESPONSIVE
=========================== */
@media (max-width: 768px) {
    section {
        padding: 60px 0;
    }

    .bu-navbar {
        padding: 8px 0;
    }

    .hero-section {
        padding: 80px 0 60px;
    }

    .hero-stats {
        flex-wrap: nowrap;
        gap: 14px;
        padding: 14px 18px;
    }

    .hero-stat-divider {
        display: none;
    }

    .cta-box {
        padding: 32px 24px;
    }

    .demo-form-card {
        padding: 24px 18px;
    }

    .process-connector {
        display: none;
    }

    .whatsapp-box {
        padding: 22px 18px;
    }

    .stats-row {
        padding: 32px 20px;
    }

    .stat-divider {
        display: none;
    }

    .coming-soon-box {
        padding: 28px 22px;
    }

    .panel-overview {
        margin-top: -16px;
        padding: 0 0 16px;
    }

    .page-hero,
    .catalog-hero,
    .platform-hero,
    .schools-hero {
        padding: 80px 0 48px;
    }
}