/* =====================================
   BIRTS HACKATHON 2026
   MAIN CSS
===================================== */

:root {

    --background: #060914;
    --background2: #0b1120;

    --card: #10182a;

    --white: #ffffff;

    --text: #f5f7ff;

    --gray: #a7b0c4;

    --primary: #7857ff;

    --blue: #20d4ff;

    --green: #a5ff4d;

    --border: rgba(255,255,255,0.10);

    --max-width: 1150px;
}


/* =====================
   RESET
===================== */

* {

    margin: 0;

    padding: 0;

    box-sizing: border-box;
}


html {

    scroll-behavior: smooth;
}


body {

    font-family: Arial, Helvetica, sans-serif;

    background: var(--background);

    color: var(--text);

    line-height: 1.6;
}


a {

    text-decoration: none;

    color: inherit;
}


.container {

    width: 92%;

    max-width: var(--max-width);

    margin: auto;
}


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

header {

    position: sticky;

    top: 0;

    z-index: 100;

    background: rgba(6,9,20,0.92);

    backdrop-filter: blur(15px);

    border-bottom: 1px solid var(--border);
}


.navbar {

    max-width: var(--max-width);

    width: 92%;

    margin: auto;

    min-height: 78px;

    display: flex;

    align-items: center;

    justify-content: space-between;
}


.logo {

    display: flex;

    align-items: center;

    gap: 10px;
}


.logo-box {

    width: 40px;

    height: 40px;

    display: grid;

    place-items: center;

    border-radius: 10px;

    font-size: 22px;

    font-weight: bold;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            var(--blue)
        );
}


.logo h2 {

    font-size: 20px;
}


.logo span {

    display: block;

    color: var(--gray);

    font-size: 8px;

    letter-spacing: 2px;

    font-weight: bold;
}


.nav-links {

    display: flex;

    list-style: none;

    gap: 25px;

    align-items: center;
}


.nav-links a {

    color: #c4ccdd;

    font-size: 14px;

    transition: 0.3s;
}


.nav-links a:hover {

    color: white;
}


.menu-btn {

    display: none;

    border: none;

    background: transparent;

    color: white;

    font-size: 28px;

    cursor: pointer;
}


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

.hero {

    min-height: 680px;

    width: 92%;

    max-width: var(--max-width);

    margin: auto;

    display: grid;

    grid-template-columns: 1.1fr 0.9fr;

    align-items: center;

    gap: 70px;

    position: relative;
}


.hero::before {

    content: "";

    position: absolute;

    width: 350px;

    height: 350px;

    background: #6d4cff;

    filter: blur(180px);

    opacity: 0.15;

    right: 0;

    top: 80px;

    pointer-events: none;
}


.badge {

    display: inline-block;

    padding: 8px 13px;

    border-radius: 30px;

    border: 1px solid rgba(120,87,255,0.4);

    background: rgba(120,87,255,0.08);

    color: #b8c7ff;

    font-size: 11px;

    font-weight: bold;

    letter-spacing: 1px;

    margin-bottom: 20px;
}


.hero h1 {

    font-size: clamp(45px, 6vw, 75px);

    line-height: 1;

    letter-spacing: -3px;

    margin-bottom: 25px;
}


.hero h1 span {

    background:
        linear-gradient(
            90deg,
            white,
            var(--blue),
            #987dff
        );

    background-clip: text;

    -webkit-background-clip: text;

    color: transparent;
}


.hero-content > p {

    max-width: 620px;

    color: var(--gray);

    font-size: 18px;

    margin-bottom: 25px;
}


.hero-buttons {

    display: flex;

    gap: 12px;

    flex-wrap: wrap;
}


.btn {

    display: inline-block;

    padding: 13px 20px;

    border-radius: 10px;

    font-weight: bold;

    transition: 0.3s;

    cursor: pointer;
}


.primary {

    color: white;

    background:
        linear-gradient(
            135deg,
            var(--primary),
            #5a9fff
        );

    box-shadow:
        0 12px 30px
        rgba(120,87,255,0.25);
}


.primary:hover {

    transform: translateY(-3px);
}


.secondary {

    border: 1px solid var(--border);

    background: rgba(255,255,255,0.03);
}


.secondary:hover {

    background: rgba(255,255,255,0.08);
}


.college-only {

    margin-top: 18px;

    color: #7e899f !important;

    font-size: 12px !important;
}


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

.hero-card {

    height: 420px;

    position: relative;

    overflow: hidden;

    border-radius: 25px;

    border: 1px solid var(--border);

    background:
        linear-gradient(
            145deg,
            rgba(120,87,255,0.20),
            rgba(16,24,42,0.9)
        );

    display: flex;

    align-items: flex-end;

    padding: 30px;

    box-shadow:
        0 30px 100px
        rgba(0,0,0,0.35);
}


.circle {

    width: 280px;

    height: 280px;

    border-radius: 50%;

    position: absolute;

    right: 30px;

    top: 45px;

    background:
        radial-gradient(
            circle,
            white 0%,
            #7658ff 10%,
            #21377c 45%,
            transparent 70%
        );

    opacity: 0.75;
}


.hero-card-content {

    position: relative;

    z-index: 2;
}


.hero-card-content > p {

    color: #b5bfd2;

    font-size: 10px;

    letter-spacing: 2px;
}


.hero-card h2 {

    font-size: 95px;

    line-height: 1;

    background:
        linear-gradient(
            90deg,
            white,
            var(--blue)
        );

    background-clip: text;

    -webkit-background-clip: text;

    color: transparent;
}


.hero-card-content > span {

    color: #c2cbe0;

    font-size: 12px;
}


.hero-stats {

    display: flex;

    gap: 25px;

    margin-top: 25px;
}


.hero-stats div {

    border-left: 1px solid var(--border);

    padding-left: 12px;
}


.hero-stats strong {

    display: block;

    font-size: 20px;
}


.hero-stats small {

    display: block;

    color: #8792a8;

    font-size: 10px;
}


/* =====================
   SECTIONS
===================== */

.section {

    padding: 100px 0;
}


.dark-section {

    background: var(--background2);
}


.section-title {

    margin-bottom: 45px;
}


.section-title > span {

    color: #9eb9ff;

    font-size: 11px;

    font-weight: bold;

    letter-spacing: 2px;
}


.section-title h2 {

    font-size: clamp(32px,4vw,50px);

    line-height: 1.1;

    margin-top: 8px;
}


.section-title p {

    color: var(--gray);

    margin-top: 12px;
}


.center {

    text-align: center;
}


/* =====================
   ABOUT
===================== */

.about-grid {

    display: grid;

    grid-template-columns: 1.1fr 0.9fr;

    gap: 60px;

    align-items: center;
}


.large-text {

    color: #e0e6f3;

    font-size: 21px;

    margin-bottom: 20px;
}


.description {

    color: var(--gray);
}


.info-card {

    border: 1px solid var(--border);

    background: rgba(255,255,255,0.025);

    border-radius: 18px;

    padding: 8px;
}


.info-item {

    display: flex;

    gap: 15px;

    padding: 20px;

    border-bottom: 1px solid var(--border);
}


.info-item:last-child {

    border-bottom: none;
}


.info-item > span {

    font-size: 25px;
}


.info-item strong {

    display: block;
}


.info-item p {

    color: var(--gray);

    font-size: 13px;
}


/* =====================
   POSTER
===================== */

.poster {

    padding: 60px 0;

    background:
        linear-gradient(
            100deg,
            #151044,
            #092b3d
        );

    border-top: 1px solid var(--border);

    border-bottom: 1px solid var(--border);
}


.poster-content {

    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 30px;
}


.poster-content > div:first-child > span {

    color: #a6baff;

    font-size: 11px;

    letter-spacing: 2px;

    font-weight: bold;
}


.poster h2 {

    font-size: 40px;

    line-height: 1.1;

    margin: 10px 0;
}


.poster p {

    color: #b7c1d4;
}


.free-box {

    min-width: 280px;

    padding: 30px;

    text-align: center;

    border-radius: 18px;

    border: 1px solid rgba(165,255,77,0.3);

    background: rgba(165,255,77,0.05);
}


.free-box small {

    display: block;

    color: #a6b0c4;

    font-size: 10px;

    letter-spacing: 2px;
}


.free-box strong {

    display: block;

    color: var(--green);

    font-size: 45px;
}


.free-box b {

    color: var(--green);

    letter-spacing: 2px;
}


.free-box p {

    margin-top: 5px;

    font-size: 12px;
}


/* =====================
   CARDS
===================== */

.cards {

    display: grid;

    grid-template-columns:
        repeat(4,1fr);

    gap: 18px;
}


.requirement-card {

    min-height: 240px;

    padding: 27px;

    border-radius: 18px;

    border: 1px solid var(--border);

    background:
        linear-gradient(
            180deg,
            #111a2d,
            #0b1220
        );

    transition: 0.3s;
}


.requirement-card:hover {

    transform: translateY(-5px);

    border-color:
        rgba(120,87,255,0.5);
}


.requirement-card.highlight {

    border-color:
        rgba(165,255,77,0.3);
}


.icon {

    font-size: 30px;

    margin-bottom: 20px;
}


.requirement-card h3 {

    margin-bottom: 10px;

    font-size: 19px;
}


.requirement-card p {

    color: var(--gray);

    font-size: 14px;
}


/* =====================
   STEPS
===================== */

.steps {

    display: grid;

    gap: 12px;
}


.step {

    display: grid;

    grid-template-columns: 60px 1fr;

    gap: 20px;

    padding: 23px;

    border: 1px solid var(--border);

    border-radius: 15px;

    background: rgba(255,255,255,0.025);
}


.number {

    color: var(--blue);

    font-size: 20px;

    font-weight: bold;
}


.step h3 {

    font-size: 18px;
}


.step p {

    color: var(--gray);

    font-size: 14px;
}


/* =====================
   REGISTER BOX
===================== */

.register-box {

    margin-top: 40px;

    padding: 30px;

    border-radius: 20px;

    border: 1px solid rgba(120,87,255,0.35);

    background:
        linear-gradient(
            100deg,
            rgba(120,87,255,0.13),
            rgba(32,212,255,0.05)
        );

    display: flex;

    align-items: center;

    justify-content: space-between;

    gap: 20px;
}


.register-box span {

    color: #a7baff;

    font-size: 10px;

    letter-spacing: 2px;
}


.register-box h3 {

    margin: 5px 0;

    font-size: 27px;
}


.register-box p {

    color: var(--gray);

    font-size: 13px;
}


/* =====================
   DEADLINE
===================== */

.deadline {

    display: grid;

    grid-template-columns: 1fr 1fr;

    gap: 30px;

    align-items: center;
}


.deadline h2 {

    font-size: 40px;

    margin: 8px 0;
}


.deadline > div:first-child > span {

    color: #9db8ff;

    font-size: 11px;

    font-weight: bold;

    letter-spacing: 2px;
}


.deadline p {

    color: var(--gray);
}


.deadline-box {

    padding: 40px;

    text-align: center;

    border: 1px dashed rgba(32,212,255,0.5);

    border-radius: 18px;

    background: rgba(32,212,255,0.04);
}


.deadline-box small {

    display: block;

    color: #8c99b0;

    font-size: 10px;

    letter-spacing: 2px;
}


.deadline-box strong {

    display: block;

    color: var(--blue);

    margin-top: 8px;

    font-size: 28px;
}


/* =====================
   TIMELINE
===================== */

.timeline {

    max-width: 800px;

    margin: auto;

    position: relative;
}


.timeline::before {

    content: "";

    position: absolute;

    left: 23px;

    top: 15px;

    bottom: 15px;

    width: 1px;

    background: var(--border);
}


.timeline-item {

    position: relative;

    display: flex;

    gap: 25px;

    padding: 15px 0;
}


.timeline-number {

    position: relative;

    z-index: 2;

    min-width: 47px;

    height: 47px;

    display: grid;

    place-items: center;

    border-radius: 50%;

    border: 1px solid var(--border);

    background: #10182b;

    color: var(--blue);

    font-size: 12px;

    font-weight: bold;
}


.timeline-item h3 {

    margin: 4px 0;
}


.timeline-item p {

    color: var(--gray);

    font-size: 13px;
}


/* =====================
   FAQ
===================== */

.faq-container {

    max-width: 900px;
}


.faq {

    display: grid;

    gap: 10px;
}


.faq-item {

    border: 1px solid var(--border);

    border-radius: 13px;

    overflow: hidden;

    background: rgba(255,255,255,0.025);
}


.faq-item button {

    width: 100%;

    padding: 20px;

    background: transparent;

    color: white;

    border: none;

    text-align: left;

    font-size: 15px;

    font-weight: bold;

    cursor: pointer;

    display: flex;

    justify-content: space-between;

    align-items: center;
}


.faq-item button span {

    font-size: 22px;

    color: var(--blue);
}


.faq-answer {

    display: none;

    padding: 0 20px 20px;

    color: var(--gray);

    font-size: 14px;
}


.faq-item.active .faq-answer {

    display: block;
}


/* =====================
   CONTACT
===================== */

.contact {

    padding: 100px 0;

    background:
        linear-gradient(
            180deg,
            #0b1120,
            #060914
        );
}


.contact-grid {

    display: grid;

    grid-template-columns:
        repeat(4,1fr);

    gap: 15px;
}


.contact-card {

    text-align: center;

    padding: 28px 15px;

    border: 1px solid var(--border);

    border-radius: 16px;

    background: rgba(255,255,255,0.025);
}


.contact-card > div {

    font-size: 30px;
}


.contact-card h3 {

    margin: 10px 0 5px;

    font-size: 17px;
}


.contact-card p {

    font-weight: bold;
}


.contact-card small {

    color: var(--gray);
}


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

footer {

    background: #040710;

    border-top: 1px solid var(--border);
}


.footer-container {

    width: 92%;

    max-width: var(--max-width);

    margin: auto;

    padding: 40px 0;

    display: flex;

    justify-content: space-between;

    align-items: center;

    gap: 25px;
}


.footer-logo {

    display: flex;

    align-items: center;

    gap: 10px;
}


.footer-container > p {

    color: var(--gray);

    font-size: 12px;
}


.footer-links {

    display: flex;

    gap: 20px;

    color: var(--gray);

    font-size: 13px;
}


.footer-links a:hover {

    color: white;
}


.copyright {

    text-align: center;

    padding: 18px;

    border-top: 1px solid var(--border);

    color: #667087;

    font-size: 11px;
}


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

@media(max-width:950px) {

    .nav-links {

        position: absolute;

        top: 78px;

        left: 0;

        right: 0;

        display: none;

        flex-direction: column;

        padding: 25px;

        background: #080d1a;

        border-bottom: 1px solid var(--border);
    }


    .nav-links.active {

        display: flex;
    }


    .menu-btn {

        display: block;
    }


    .hero {

        grid-template-columns: 1fr;

        padding: 70px 0;
    }


    .about-grid {

        grid-template-columns: 1fr;
    }


    .cards {

        grid-template-columns:
            repeat(2,1fr);
    }


    .contact-grid {

        grid-template-columns:
            repeat(2,1fr);
    }


    .poster-content {

        flex-direction: column;

        align-items: flex-start;
    }


    .deadline {

        grid-template-columns: 1fr;
    }


    .footer-container {

        flex-direction: column;

        align-items: flex-start;
    }

}


@media(max-width:600px) {

    .hero h1 {

        font-size: 46px;
    }


    .hero-card {

        height: 350px;
    }


    .hero-card h2 {

        font-size: 70px;
    }


    .cards {

        grid-template-columns: 1fr;
    }


    .contact-grid {

        grid-template-columns: 1fr;
    }


    .register-box {

        flex-direction: column;

        align-items: flex-start;
    }


    .free-box {

        width: 100%;
    }


    .poster h2 {

        font-size: 32px;
    }


    .deadline h2 {

        font-size: 32px;
    }


    .footer-links {

        flex-wrap: wrap;
    }

}


/* =====================================================
   HACKATHON POSTER IMAGE
===================================================== */

.poster-image-container {

    width: 100%;

    max-width: 1200px;

    margin: 0 auto;

    padding: 15px;

    border-radius: 20px;

    background: rgba(255, 255, 255, 0.04);

    border: 1px solid rgba(255, 255, 255, 0.12);

    box-shadow:
        0 25px 70px rgba(0, 0, 0, 0.35);

}


.hackathon-poster {

    display: block;

    width: 100%;

    height: auto;

    border-radius: 12px;

}


/* Mobile */

@media (max-width: 700px) {

    .poster-image-container {

        padding: 7px;

        border-radius: 12px;

    }

    .hackathon-poster {

        border-radius: 8px;

    }

}