/* -- Reset & Base -- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
    --transition-speed: 0.7s;
    --ease: cubic-bezier(0.4, 0, 0.2, 1);
    --navy: rgb(3, 19, 71);
}

html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', sans-serif;
    overflow-x: hidden;
    transition: background-color var(--transition-speed) var(--ease),
                color var(--transition-speed) var(--ease);
}

.logo { display: none; }

body.theme-black .logo-white,
body.theme-blue  .logo-white { display: inline; }

body.theme-white .logo-blue  { display: inline; }

/* -- THEMES -- */
body.theme-black {
    background-color: #0a0a0a;
    color: #f0f0ee;
    --header-bg: rgba(8,8,8,0.85);
    --btn-bg: transparent;
    --btn-border: rgba(240,240,238,0.5);
    --btn-color: #f0f0ee;
    --btn-hover-bg: #f0f0ee;
    --btn-hover-color: #0a0a0a;
    --nav-color: rgba(240,240,238,0.8);
    --nav-hover: #f0f0ee;
    --underline-color: #f0f0ee;
    --tag-bg: rgba(255,255,255,0.07);
    --tag-color: rgba(240,240,238,0.65);
    --divider: rgba(255,255,255,0.08);
    --footer-muted: rgba(240,240,238,0.35);
    --section-alt: #111111;
    --card-bg: rgba(255,255,255,0.04);
    --card-border: rgba(255,255,255,0.08);
    --icon-filter: invert(1);
}

body.theme-blue {
    background-color: #03134a;
    color: #e8edf8;
    --header-bg: rgba(2,10,42,0.88);
    --btn-bg: transparent;
    --btn-border: rgba(232,237,248,0.45);
    --btn-color: #e8edf8;
    --btn-hover-bg: #e8edf8;
    --btn-hover-color: #03134a;
    --nav-color: rgba(232,237,248,0.75);
    --nav-hover: #e8edf8;
    --underline-color: #e8edf8;
    --tag-bg: rgba(255,255,255,0.08);
    --tag-color: rgba(232,237,248,0.6);
    --divider: rgba(255,255,255,0.1);
    --footer-muted: rgba(232,237,248,0.35);
    --section-alt: #040f3b;
    --card-bg: rgba(255,255,255,0.05);
    --card-border: rgba(255,255,255,0.1);
    --icon-filter: invert(1);
}

body.theme-white {
    background-color: #f5f5f3;
    color: var(--navy);
    --header-bg: rgba(245,245,243,0.88);
    --btn-bg: transparent;
    --btn-border: rgba(3,19,71,0.4);
    --btn-color: var(--navy);
    --btn-hover-bg: var(--navy);
    --btn-hover-color: #f5f5f3;
    --nav-color: rgba(3,19,71,0.65);
    --nav-hover: var(--navy);
    --underline-color: var(--navy);
    --tag-bg: rgba(3,19,71,0.07);
    --tag-color: rgba(3,19,71,0.5);
    --divider: rgba(3,19,71,0.1);
    --footer-muted: rgba(3,19,71,0.35);
    --section-alt: #eeede9;
    --card-bg: rgba(3,19,71,0.04);
    --card-border: rgba(3,19,71,0.08);
    --icon-filter: none;
}

/* -- LOGO COLORS -- */
/* White logo - black & blue themes */
body.theme-black .logo-white { display: inline; }
body.theme-black .logo-blue  { display: none; }
body.theme-blue  .logo-white { display: inline; }
body.theme-blue  .logo-blue  { display: none; }
/* Blue logo - white theme */
body.theme-white .logo-white { display: none; }
body.theme-white .logo-blue  { display: inline; }

/* -- HEADER -- */
header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    background: var(--header-bg);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 5%;
    height: 80px;
    transition: background var(--transition-speed) var(--ease),
                border-color var(--transition-speed) var(--ease);
}

.header-left { display: flex; align-items: center; gap: 0; }

.logo-link { text-decoration: none; display: flex; align-items: center; }

.logo-img {
    height: 36px;
    width: auto;
    transition: opacity 0.3s ease;
}

/* -- NAV -- */
nav { display: flex; align-items: center; gap: 40px; }

nav a {
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.02em;
    color: var(--nav-color);
    text-decoration: none;
    position: relative;
    padding-bottom: 3px;
    transition: color 0.3s ease;
}
nav a::after {
    content: '';
    position: absolute;
    bottom: 0; left: 0;
    width: 0%; height: 1px;
    background: var(--underline-color);
    transition: width 0.35s var(--ease);
}
nav a:hover { color: var(--nav-hover); }
nav a:hover::after { width: 100%; }

/* -- THEME SWITCHER -- */
.theme-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: 36px;
}

.theme-dot {
    width: 14px; height: 14px;
    border-radius: 50%;
    cursor: pointer;
    border: 2px solid transparent;
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.theme-dot:hover { transform: scale(1.25); }
.theme-dot.active {
    border-color: var(--nav-hover);
    box-shadow: 0 0 0 2px var(--nav-hover);
}
.dot-black { background: #111; }
.dot-blue  { background: #0a2ad4; }
.dot-white { background: #f0f0ee; }

/* -- HAMBURGER -- */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    background: none;
    border: none;
}
.hamburger span {
    display: block;
    width: 24px; height: 2px;
    background: var(--nav-hover);
    border-radius: 2px;
    transition: transform 0.35s var(--ease), opacity 0.35s ease;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* -- MOBILE NAV -- */
.mobile-nav {
    display: none;
    position: fixed;
    top: 80px; left: 0; right: 0;
    background: var(--header-bg);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--divider);
    padding: 24px 5% 32px;
    flex-direction: column;
    gap: 24px;
    z-index: 99;
    transition: background var(--transition-speed) var(--ease);
}
.mobile-nav.open { display: flex; }
.mobile-nav a {
    font-size: 20px;
    font-weight: 500;
    color: var(--nav-color);
    text-decoration: none;
    transition: color 0.2s ease;
}
.mobile-nav a:hover { color: var(--nav-hover); }
.mobile-theme-switcher { display: flex; gap: 12px; margin-top: 8px; }
.mobile-theme-switcher .theme-dot { width: 18px; height: 18px; }

/* -- HERO -- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 5% 80px;
    position: relative;
    overflow: hidden;
}

/* Decorative background stripe */
.hero::before {
    content: '';
    position: absolute;
    top: -20%; right: -10%;
    width: 60%; height: 140%;
    background: linear-gradient(135deg, transparent 30%, var(--divider) 100%);
    pointer-events: none;
    opacity: 0.4;
}

.hero-inner {
    max-width: 900px;
    width: 100%;
    text-align: center;
    position: relative;
    z-index: 1;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--tag-color);
    background: var(--tag-bg);
    border: 1px solid var(--divider);
    border-radius: 100px;
    padding: 6px 16px;
    margin-bottom: 36px;
    animation: fadeUp 0.8s var(--ease) both;
}
.hero-eyebrow span { width: 5px; height: 5px; border-radius: 50%; background: currentColor; }

.hero-title {
    font-family: 'Syne', sans-serif;
    font-size: clamp(52px, 9vw, 110px);
    font-weight: 800;
    line-height: 0.95;
    letter-spacing: -0.04em;
    margin-bottom: 28px;
    animation: fadeUp 0.8s 0.1s var(--ease) both;
}

.hero-title em {
    font-style: normal;
    position: relative;
    display: inline-block;
}

.hero-desc {
    font-size: clamp(16px, 2vw, 19px);
    font-weight: 300;
    line-height: 1.65;
    max-width: 560px;
    margin: 0 auto 52px;
    opacity: 0.75;
    animation: fadeUp 0.8s 0.2s var(--ease) both;
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
    animation: fadeUp 0.8s 0.3s var(--ease) both;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    font-weight: 500;
    letter-spacing: 0.02em;
    text-decoration: none;
    border-radius: 100px;
    padding: 14px 34px;
    border: 1.5px solid var(--btn-border);
    color: var(--btn-color);
    background: var(--btn-bg);
    cursor: pointer;
    transition: background 0.3s var(--ease),
                color 0.3s var(--ease),
                border-color 0.3s var(--ease),
                box-shadow 0.3s ease,
                transform 0.2s ease;
}
.btn:hover {
    background: var(--btn-hover-bg);
    color: var(--btn-hover-color);
    border-color: var(--btn-hover-bg);
    box-shadow: 0 4px 24px rgba(0,0,0,0.18);
    transform: translateY(-2px);
}
.btn-filled {
    background: var(--btn-hover-bg);
    color: var(--btn-hover-color);
    border-color: var(--btn-hover-bg);
}
.btn-filled:hover {
    opacity: 0.88;
    transform: translateY(-2px);
}

/* -- SECTION SHARED -- */
section { padding: 100px 5%; }
.section-alt { background: var(--section-alt); }

.section-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--tag-color);
    margin-bottom: 16px;
}
.section-title {
    font-family: 'Syne', sans-serif;
    font-size: clamp(34px, 5vw, 60px);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.05;
    max-width: 680px;
    margin-bottom: 24px;
}
.section-desc {
    font-size: 17px;
    font-weight: 300;
    line-height: 1.7;
    opacity: 0.7;
    max-width: 560px;
    margin-bottom: 60px;
}
.divider {
    width: 100%;
    height: 1px;
    background: var(--divider);
    margin: 0;
}

/* -- ABOUT -- */
#about-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text { max-width: 520px; }
.about-text p {
    font-size: 17px;
    font-weight: 300;
    line-height: 1.75;
    opacity: 0.72;
    margin-bottom: 20px;
}

.team-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.team-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 28px 24px;
    transition: background 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
    cursor: default;
}
.team-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.12);
}
.team-card h3 {
    font-family: 'Syne', sans-serif;
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 8px;
}
.team-card p {
    font-size: 14px;
    opacity: 0.55;
    line-height: 1.5;
}
.team-icon {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--divider);
    margin-bottom: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

/* -- SERVICES -- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.service-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 36px 28px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease;
}
.service-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.15);
}
.service-num {
    font-family: 'Syne', sans-serif;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.15em;
    opacity: 0.35;
    margin-bottom: 20px;
}
.service-card h3 {
    font-family: 'Syne', sans-serif;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 12px;
}
.service-card p {
    font-size: 15px;
    font-weight: 300;
    line-height: 1.65;
    opacity: 0.65;
}

/* -- PROJECTS -- */
.projects-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 48px;
    gap: 20px;
}
.projects-header .section-title { margin-bottom: 0; }

.projects-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.project-card {
    border: 1px solid var(--card-border);
    border-radius: 20px;
    overflow: hidden;
    background: var(--card-bg);
    transition: transform 0.35s ease, box-shadow 0.35s ease;
}
.project-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 24px 60px rgba(0,0,0,0.18);
}
.project-thumb {
    aspect-ratio: 16/9;
    background: var(--section-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--card-border);
    font-family: 'Syne', sans-serif;
    font-size: 13px;
    letter-spacing: 0.1em;
    opacity: 0.3;
    position: relative;
    overflow: hidden;
}
.project-thumb::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--divider) 0%, transparent 60%);
}
.project-body { padding: 24px 28px; }
.project-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 14px;
}
.tag {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    background: var(--tag-bg);
    color: var(--tag-color);
    border-radius: 100px;
    padding: 4px 12px;
}
.project-body h3 {
    font-family: 'Syne', sans-serif;
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 10px;
}
.project-body p {
    font-size: 14px;
    font-weight: 300;
    line-height: 1.6;
    opacity: 0.6;
}

/* -- CONTACT --*/
#contact {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.contact-info .section-desc { margin-bottom: 36px; }

.social-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}
.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    color: var(--nav-color);
    border: 1px solid var(--card-border);
    border-radius: 100px;
    padding: 10px 20px;
    transition: color 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.social-link:hover {
    color: var(--nav-hover);
    border-color: var(--nav-hover);
    background: var(--tag-bg);
}
.social-link img {
    width: 16px; height: 16px;
    filter: var(--icon-filter);
    opacity: 0.7;
}
body.theme-white .social-link img { filter: none; opacity: 0.5; }

.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label {
    font-size: 12px;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    opacity: 0.55;
}
.form-group input,
.form-group textarea {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 14px 18px;
    font-family: 'DM Sans', sans-serif;
    font-size: 15px;
    color: inherit;
    outline: none;
    transition: border-color 0.25s ease, background 0.25s ease;
    resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--underline-color);
}
.form-group input::placeholder,
.form-group textarea::placeholder { opacity: 0.4; }
.form-group textarea { min-height: 120px; }

/* -- FOOTER -- */
footer {
    padding: 40px 5%;
    border-top: 1px solid var(--divider);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    flex-wrap: wrap;
}
footer p {
    font-size: 13px;
    color: var(--footer-muted);
}
.footer-logo { height: 26px; width: auto; }

/* -- ANIMATIONS -- */
@keyframes fadeUp {
    from { opacity: 0; transform: translateY(24px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* -- SCROLL REVEAL -- */
.reveal {
    opacity: 0;
    transform: translateY(32px);
    transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }

/* -- RESPONSIVE -- */
@media (max-width: 1024px) {
    #about-section { grid-template-columns: 1fr; gap: 48px; }
    .services-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    header { padding: 0 6%; height: 68px; }
    nav, .theme-switcher { display: none; }
    .hamburger { display: flex; }
    .mobile-nav { top: 68px; }

    .hero { padding: 100px 6% 60px; }

    section { padding: 72px 6%; }

    #about-section { grid-template-columns: 1fr; gap: 40px; }
    .team-grid { grid-template-columns: 1fr; gap: 12px; }

    .services-grid { grid-template-columns: 1fr; }

    .projects-header { flex-direction: column; align-items: flex-start; }
    .projects-grid { grid-template-columns: 1fr; }

    #contact { grid-template-columns: 1fr; gap: 48px; }

    footer { flex-direction: column; align-items: flex-start; gap: 12px; }
}

@media (max-width: 480px) {
    .hero-cta { gap: 12px; }
    .btn { padding: 13px 26px; font-size: 14px; }
    .social-links { flex-direction: column; }
}