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

html {
    scroll-behavior: smooth;
}

body {
    font-family: Inter, Arial, sans-serif;
    background: #0A0A0A;
    color: #FFFFFF;
    line-height: 1.6;
}


/* =========================
   NAVBAR
========================= */

.navbar {
    position: sticky;
    top: 0;
    z-index: 1000;

    height: 80px;
    padding: 0 8%;

    display: flex;
    align-items: center;
    justify-content: space-between;

    background: rgba(10, 10, 10, 0.94);
    border-bottom: 1px solid rgba(255,255,255,0.08);

    backdrop-filter: blur(15px);
}

.logo {
    color: #FFFFFF;
    text-decoration: none;
    font-size: 25px;
    font-weight: 800;
}

.logo span {
    color: #FF4D0F;
}

.navbar nav {
    display: flex;
    gap: 32px;
}

.navbar nav a {
    color: #BDBDBD;
    text-decoration: none;
    font-weight: 500;
    transition: 0.3s;
}

.navbar nav a:hover,
.navbar nav a.active {
    color: #FFFFFF;
}

.navbar nav a.active {
    border-bottom: 2px solid #FF4D0F;
    padding-bottom: 7px;
}

.theme-btn {
    width: 42px;
    height: 42px;

    border-radius: 50%;
    border: 1px solid rgba(255,255,255,0.15);

    background: #181818;
    color: white;

    cursor: pointer;
}


/* =========================
   HERO
========================= */

.hero {
    min-height: 75vh;

    display: flex;
    align-items: center;

    padding: 100px 8%;

    background:
        radial-gradient(
            circle at 80% 40%,
            rgba(255,77,15,0.16),
            transparent 35%
        ),
        #0A0A0A;
}

.hero-content {
    max-width: 950px;
}

.eyebrow,
.section-heading > span {
    color: #FF4D0F;
    font-size: 14px;
    font-weight: 700;
    letter-spacing: 2px;
}

.hero h1 {
    margin: 25px 0;

    font-size: clamp(55px, 8vw, 110px);
    line-height: 0.95;
    letter-spacing: -5px;
}

.hero h1 span {
    display: block;
    color: #FF4D0F;
}

.hero p {
    max-width: 720px;

    color: #BDBDBD;

    font-size: 19px;
    line-height: 1.8;

    margin-bottom: 35px;
}

.hero-btn,
.cta a {
    display: inline-block;

    padding: 15px 25px;

    border-radius: 8px;

    background: #FF4D0F;
    color: #FFFFFF;

    text-decoration: none;
    font-weight: 700;

    transition: 0.3s;
}

.hero-btn:hover,
.cta a:hover {
    transform: translateY(-3px);
}


/* =========================
   INTRO
========================= */

.intro {
    padding: 120px 8%;

    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;

    background: #111111;
}

.section-heading {
    max-width: 800px;
    margin-bottom: 55px;
}

.section-heading h2 {
    margin-top: 18px;

    font-size: clamp(40px, 5vw, 65px);
    line-height: 1;
    letter-spacing: -3px;
}

.section-heading strong {
    color: #FF4D0F;
}

.intro-text {
    color: #AFAFAF;
    font-size: 17px;
    line-height: 1.8;
}

.intro-text p + p {
    margin-top: 25px;
}


/* =========================
   MATERIALS
========================= */

.materials {
    padding: 120px 8%;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.material-card {
    padding: 35px;

    background: #1A1A1A;

    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 18px;

    transition: 0.3s;
}

.material-card:hover {
    transform: translateY(-6px);
    border-color: #FF4D0F;
}

.material-number {
    color: #FF4D0F;
    font-weight: 700;
}

.material-icon {
    width: 52px;
    height: 52px;

    display: flex;
    align-items: center;
    justify-content: center;

    margin: 25px 0;

    border: 1px solid rgba(255,77,15,0.5);
    border-radius: 12px;

    color: #FF4D0F;
    font-size: 22px;
}

.material-card h3 {
    font-size: 28px;
    margin-bottom: 12px;
}

.material-card p {
    color: #AFAFAF;
    margin-bottom: 25px;
}

.material-card ul {
    list-style: none;
    margin-bottom: 25px;
}

.material-card li {
    color: #D5D5D5;
    margin: 9px 0;
}

.material-card li::before {
    content: "✓";
    color: #FF4D0F;
    margin-right: 10px;
}

.material-btn {
    border: none;
    background: transparent;

    color: #FF4D0F;

    font-size: 15px;
    font-weight: 700;

    cursor: pointer;

    transition: 0.3s;
}

.material-btn:hover {
    transform: translateX(5px);
}


/* =========================
   DESIGN SYSTEM
========================= */

.design-system {
    padding: 120px 8%;
    background: #111111;
}

.system-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.system-card {
    padding: 30px;

    min-height: 190px;

    background: #181818;

    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 15px;

    transition: 0.3s;
}

.system-card:hover {
    border-color: #FF4D0F;
    transform: translateY(-5px);
}

.system-card span {
    color: #FF4D0F;
    font-weight: 700;
}

.system-card h3 {
    margin: 28px 0 10px;
    font-size: 24px;
}

.system-card p {
    color: #AFAFAF;
}


/* =========================
   PROCESS
========================= */

.process {
    padding: 120px 8%;
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.process-card {
    padding: 30px;

    border-top: 2px solid #FF4D0F;
}

.process-card span {
    color: #FF4D0F;
    font-weight: 700;
}

.process-card h3 {
    margin: 25px 0 10px;
    font-size: 24px;
}

.process-card p {
    color: #AFAFAF;
}


/* =========================
   CTA
========================= */

.cta {
    padding: 140px 8%;
    text-align: center;

    background: #111111;
}

.cta > span {
    color: #FF4D0F;

    font-size: 13px;
    font-weight: 700;

    letter-spacing: 2px;
}

.cta h2 {
    max-width: 900px;

    margin: 25px auto 35px;

    font-size: clamp(45px, 6vw, 80px);
    line-height: 1;

    letter-spacing: -4px;
}

.cta h2 strong {
    display: block;
    color: #FF4D0F;
}


/* =========================
   TOAST
========================= */

.toast {
    position: fixed;

    left: 50%;
    bottom: 30px;

    transform: translate(-50%, 100px);

    padding: 14px 22px;

    background: #FF4D0F;
    color: white;

    border-radius: 8px;

    font-weight: 600;

    opacity: 0;

    transition: 0.3s;

    z-index: 2000;
}

.toast.show {
    transform: translate(-50%, 0);
    opacity: 1;
}


/* =========================
   FOOTER
========================= */

footer {
    padding: 30px 8%;

    text-align: center;

    color: #777;

    border-top: 1px solid rgba(255,255,255,0.08);
}


/* =========================
   LIGHT MODE
========================= */

body.light-mode {
    background: #F5F5F5;
    color: #111111;
}

body.light-mode .navbar {
    background: rgba(245,245,245,0.95);
}

body.light-mode .navbar nav a,
body.light-mode .logo {
    color: #111111;
}

body.light-mode .hero,
body.light-mode .materials,
body.light-mode .process {
    background: #F5F5F5;
}

body.light-mode .intro,
body.light-mode .design-system,
body.light-mode .cta {
    background: #EAEAEA;
}

body.light-mode .material-card,
body.light-mode .system-card {
    background: #FFFFFF;
}

body.light-mode .material-card p,
body.light-mode .system-card p,
body.light-mode .process-card p,
body.light-mode .intro-text {
    color: #555555;
}


/* =========================
   RESPONSIVE
========================= */

@media (max-width: 900px) {

    .navbar {
        padding: 0 5%;
    }

    .navbar nav {
        display: none;
    }

    .intro {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

    .system-grid,
    .process-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}


@media (max-width: 600px) {

    .hero {
        padding: 80px 6%;
    }

    .intro,
    .materials,
    .design-system,
    .process,
    .cta {
        padding: 80px 6%;
    }

    .system-grid,
    .process-grid {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        letter-spacing: -3px;
    }
}