/* --------------------------------------------------------------
   Global layout & structural sections
-------------------------------------------------------------- */
.site-header {
    background: rgba(5, 12, 26, 0.9);
    backdrop-filter: blur(18px);
    border-bottom: 1px solid rgba(94, 234, 212, 0.08);
    position: sticky;
    top: 0;
    z-index: 1100;
    padding: 1.1rem 0;
    box-shadow: 0 18px 36px rgba(3, 7, 18, 0.6);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.site-logo img {
    height: 52px;
    width: auto;
}

.main-navigation {
    position: relative;
}

.main-navigation ul {
    display: flex;
    align-items: center;
    list-style: none;
    gap: 2rem;
    position: relative;
}

.main-navigation a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.3rem 0;
    font-weight: 500;
    letter-spacing: 0.02em;
    color: #e2e8f0;
    position: relative;
}

.main-navigation a::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -6px;
    height: 2px;
    background: linear-gradient(90deg, var(--mtd-primary), var(--mtd-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.main-navigation a:hover,
.main-navigation a:focus,
.main-navigation a.current {
    color: #f8fafc;
}

.main-navigation a:hover::after,
.main-navigation a:focus::after,
.main-navigation a.current::after {
    transform: scaleX(1);
}

.menu-toggle {
    display: none;
    background: rgba(15, 23, 42, 0.85);
    color: #f8fafc;
    border: 1px solid rgba(96, 165, 250, 0.4);
    border-radius: 999px;
    padding: 0.45rem 0.9rem;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background 0.3s ease, transform 0.3s ease;
}

.menu-toggle:hover,
.menu-toggle:focus {
    background: rgba(59, 130, 246, 0.2);
    transform: translateY(-1px);
}

@media (max-width: 900px) {
    .menu-toggle {
        display: inline-flex;
        align-items: center;
        gap: 0.45rem;
    }

    .main-navigation ul {
        position: absolute;
        top: calc(100% + 0.75rem);
        right: 1.5rem;
        left: 1.5rem;
        flex-direction: column;
        align-items: flex-start;
        padding: 1.2rem 1.5rem;
        border-radius: var(--mtd-radius-medium);
        background: rgba(8, 15, 33, 0.95);
        border: 1px solid rgba(96, 165, 250, 0.2);
        box-shadow: 0 24px 55px rgba(2, 6, 17, 0.65);
        display: none;
    }

    .main-navigation ul.active {
        display: flex;
    }

    .main-navigation li {
        width: 100%;
    }

    .main-navigation a {
        width: 100%;
        justify-content: space-between;
        padding: 0.6rem 0;
    }
}

.hero {
    padding: clamp(5rem, 9vw, 7.5rem) 0;
    background:
        radial-gradient(circle at 18% 22%, rgba(56, 189, 248, 0.22) 0%, rgba(4, 9, 21, 0) 45%),
        radial-gradient(circle at 82% 14%, rgba(37, 99, 235, 0.26) 0%, rgba(4, 9, 21, 0) 50%),
        linear-gradient(135deg, #0b1120 0%, #111c3a 55%, #0b1120 100%);
    position: relative;
    overflow: hidden;
    border-bottom: 1px solid rgba(148, 163, 184, 0.16);
    color: #f8fafc;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        repeating-conic-gradient(from 0deg at 50% 50%, rgba(148, 163, 184, 0.04) 0deg, rgba(4, 9, 21, 0) 30deg, rgba(148, 163, 184, 0.04) 60deg, rgba(4, 9, 21, 0) 90deg);
    opacity: 0.45;
    animation: slowRotate 36s linear infinite;
    mix-blend-mode: screen;
    z-index: 1;
}

.hero::after {
    content: '';
    position: absolute;
    inset: 18% auto auto 50%;
    width: 520px;
    height: 520px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.28) 0%, rgba(56, 189, 248, 0) 70%);
    transform: translateX(-50%);
    filter: blur(34px);
    opacity: 0.6;
    pointer-events: none;
    z-index: 1;
}

.hero > * {
    position: relative;
    z-index: 2;
}

.hero .container {
    max-width: 960px;
    text-align: center;
}

.hero h1 {
    font-family: 'Ubuntu', -apple-system, 'Segoe UI', sans-serif;
    font-size: clamp(2.7rem, 6vw, 3.8rem);
    letter-spacing: -0.015em;
    margin-bottom: 1rem;
}

.hero .tagline {
    font-size: clamp(1.1rem, 2.2vw, 1.45rem);
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: rgba(226, 232, 240, 0.7);
    margin-bottom: 1.7rem;
}

.hero .description {
    max-width: 720px;
    margin: 0 auto 3rem;
    color: rgba(226, 232, 240, 0.78);
}

.hero .btn + .btn {
    margin-left: 1rem;
}

@keyframes slowRotate {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(4, 9, 21, 0.58);
    z-index: 1;
}

.content-section {
    position: relative;
    padding: clamp(3.5rem, 7vw, 5.5rem) 0;
    color: var(--mtd-text);
}

.content-section:nth-of-type(even) {
    background: rgba(8, 15, 33, 0.55);
}

.content-section[style*="#f8fafc" i],
.content-section[style*="#ffffff" i],
.content-section[style*="#fff" i],
.content-section.content-light,
.content-section.light-surface {
    background: #f8fafc !important;
    color: #0f172a;
}

.content-section[style*="#f8fafc" i] p,
.content-section[style*="#f8fafc" i] li,
.content-section[style*="#f8fafc" i] h2,
.content-section[style*="#f8fafc" i] h3,
.content-section[style*="#f8fafc" i] h4,
.content-section[style*="#f8fafc" i] h5,
.content-section[style*="#f8fafc" i] h6,
.content-section[style*="#ffffff" i] p,
.content-section[style*="#ffffff" i] li,
.content-section[style*="#ffffff" i] h2,
.content-section[style*="#ffffff" i] h3,
.content-section[style*="#ffffff" i] h4,
.content-section[style*="#ffffff" i] h5,
.content-section[style*="#ffffff" i] h6,
.content-section[style*="#fff" i] p,
.content-section[style*="#fff" i] li,
.content-section[style*="#fff" i] h2,
.content-section[style*="#fff" i] h3,
.content-section[style*="#fff" i] h4,
.content-section[style*="#fff" i] h5,
.content-section[style*="#fff" i] h6,
.content-section.content-light p,
.content-section.content-light li,
.content-section.content-light h2,
.content-section.content-light h3,
.content-section.content-light h4,
.content-section.content-light h5,
.content-section.content-light h6,
.content-section.light-surface p,
.content-section.light-surface li,
.content-section.light-surface h2,
.content-section.light-surface h3,
.content-section.light-surface h4,
.content-section.light-surface h5,
.content-section.light-surface h6 {
    color: #1e293b;
}

.content-section .container::after {
    content: '';
    position: absolute;
    inset: auto 10% -35% 55%;
    width: 420px;
    height: 420px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.18) 0%, rgba(56, 189, 248, 0) 70%);
    filter: blur(55px);
    opacity: 0.35;
    pointer-events: none;
    z-index: -1;
}

.site-footer {
    background: rgba(6, 12, 26, 0.96);
    border-top: 1px solid rgba(94, 234, 212, 0.16);
    padding: 3.5rem 0 2rem;
    color: rgba(226, 232, 240, 0.82);
    box-shadow: 0 -24px 48px rgba(3, 7, 18, 0.65);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: clamp(2rem, 4vw, 3rem);
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #fbbf24;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.footer-section a {
    color: rgba(226, 232, 240, 0.8);
    transition: color 0.3s ease;
}

.footer-section a:hover,
.footer-section a:focus {
    color: #f8fafc;
}

.footer-bottom {
    border-top: 1px solid rgba(94, 234, 212, 0.16);
    padding-top: 1.5rem;
    text-align: center;
    color: rgba(148, 163, 184, 0.75);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        align-items: stretch;
        gap: 1.25rem;
    }

    .hero {
        padding: 4rem 0;
    }

    .hero .btn + .btn {
        margin-left: 0;
        margin-top: 1rem;
    }

    .content-section .container::after {
        inset: auto auto -30% auto;
        width: 340px;
        height: 340px;
    }
}