/* ============================================================
   RESET & VARIABLES (matching home.css)
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --light-bg: #f8fafc;
    --darker-bg: #1e293b;
    --text-dark: #1e293b;
    --text-light: #64748b;
    --border-color: #e2e8f0;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --space-blue: #0f172a;
    --cosmic-purple: #7c3aed;
    --nebula-pink: #f472b6;
}

/* ============================================================
   BASE
   ============================================================ */
body {
    font-family: "Inter", "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    background-attachment: fixed;
    color: var(--text-dark);
    line-height: 1.6;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* ============================================================
   HEADER & NAVBAR (desktop)
   ============================================================ */
header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    padding: 1.2rem 0;
    box-shadow: 0 4px 30px rgba(99, 102, 241, 0.3);
    position: sticky;
    top: 0;
    z-index: 999;
    animation: slideDown 0.5s ease-out;
    border-bottom: 1px solid rgba(99, 102, 241, 0.2);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.navbar {
    display: flex;
    align-items: center;
    padding: 0 2rem;
    max-width: 1400px;
    margin: auto;
    justify-content: space-between;
}

.navbar-logo-group {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-right: 2rem;
    flex-shrink: 0;
}

.iit-logo {
    height: 45px;
    transition: transform 0.3s ease;
}
.iit-logo:hover {
    transform: scale(1.05);
}

.logo {
    height: 60px;
    transition: transform 0.3s ease;
}
.logo:hover {
    transform: scale(1.05);
}

/* nav-menu wraps both <ul> and the registration btn */
.nav-menu {
    display: flex;
    align-items: center;
    flex: 1;
    justify-content: space-between;
}

.navlinks {
    list-style: none;
    display: flex;
    gap: 2rem;
    flex: 1;
}

.navlinks a {
    text-decoration: none;
    color: #fff;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: all 0.3s ease;
    padding: 0.5rem 0;
}

.navlinks a::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        var(--secondary-color)
    );
    transition: width 0.3s ease;
}
.navlinks a:hover::after {
    width: 100%;
}
.navlinks a:hover {
    color: #a5b4fc;
    transform: translateY(-2px);
}

/* hide the chevron arrows on desktop */
.dropdown-arrow {
    display: none;
}

/* ─── Registration Button ─── */
.registration-btn {
    background: linear-gradient(
        135deg,
        var(--primary-color) 0%,
        var(--secondary-color) 100%
    );
    color: #fff;
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    flex-shrink: 0;
}

.registration-btn::before {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition:
        width 0.6s,
        height 0.6s;
}
.registration-btn:hover::before {
    width: 300px;
    height: 300px;
}
.registration-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(99, 102, 241, 0.5);
}
.registration-btn:active {
    transform: translateY(0);
}

/* ─── Hamburger (hidden on desktop) ─── */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    width: 40px;
    height: 40px;
    padding: 6px;
    z-index: 1001;
    flex-shrink: 0;
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2.5px;
    background: #fff;
    border-radius: 2px;
    transition:
        transform 0.35s ease,
        opacity 0.35s ease;
}

/* animated "X" state */
.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}
.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}
.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ─── Dropdown Menu (desktop hover) ─── */
.dropdown {
    position: relative;
}
.dropdown-toggle {
    cursor: pointer;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: 12px;
    min-width: 220px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
        opacity 0.3s ease,
        visibility 0.3s ease,
        transform 0.3s ease;
    z-index: 1000;
    margin-top: 0.5rem;
    backdrop-filter: blur(10px);
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu a {
    padding: 0.75rem 1rem;
    text-decoration: none;
    color: var(--text-dark);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
    font-size: 0.92rem;
}
.dropdown-menu a:last-child {
    border-bottom: none;
}
.dropdown-menu a:hover {
    background: linear-gradient(
        135deg,
        rgba(99, 102, 241, 0.15),
        rgba(139, 92, 246, 0.15)
    );
    color: var(--primary-color);
    font-weight: 600;
    padding-left: 1.25rem;
    transform: translateX(5px);
}

/* ============================================================
   PARTICLES (matching home page)
   ============================================================ */
.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

.particle {
    position: absolute;
    background: white;
    border-radius: 50%;
    animation: twinkle var(--duration) infinite;
    opacity: 0;
}

@keyframes twinkle {
    0%,
    100% {
        opacity: 0;
    }
    50% {
        opacity: var(--opacity);
    }
}

/* ============================================================
   CITY GUIDE PAGE SPECIFIC
   ============================================================ */
.city-guide-main {
    background: transparent;
    position: relative;
    min-height: 100vh;
}

.city-guide-hero {
    text-align: center;
    padding: 8rem 2rem 6rem;
    background: transparent;
    margin: 0;
    position: relative;
    overflow: hidden;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.city-guide-hero::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(
            circle at 20% 50%,
            rgba(244, 114, 182, 0.15) 0%,
            transparent 50%
        ),
        radial-gradient(
            circle at 80% 80%,
            rgba(99, 102, 241, 0.15) 0%,
            transparent 50%
        );
    pointer-events: none;
    z-index: 0;
}

.city-guide-hero h1 {
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(135deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1rem;
    font-family: "Space Grotesk", sans-serif;
    position: relative;
    z-index: 1;
    text-shadow: 0 0 80px rgba(165, 180, 252, 0.5);
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.city-guide-hero h2 {
    font-size: 1.5rem;
    font-weight: 600;
    color: #cbd5e1;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.city-guide-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem;
    position: relative;
    z-index: 1;
}

/* ─── Intro Section ─── */
.intro-section {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    padding: 2.5rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    margin-bottom: 4rem;
    animation: fadeInUp 0.8s ease-out 0.4s both;
    transition: all 0.4s ease;
}

.intro-section:hover {
    background: rgba(255, 255, 255, 0.08);
    box-shadow: 0 15px 40px rgba(99, 102, 241, 0.2);
}

.intro-section p {
    color: #e2e8f0;
    font-size: 1.1rem;
    line-height: 1.9;
    text-align: justify;
    margin: 0;
}

/* ─── Attractions Container ─── */
.attractions-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
    margin: 3rem 0 5rem;
}

.attraction-card {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(99, 102, 241, 0.3);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    animation: fadeInUp 0.8s ease-out;
    position: relative;
}

.attraction-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        var(--secondary-color)
    );
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.attraction-card:hover::before {
    transform: scaleX(1);
}

.attraction-card:hover {
    transform: translateY(-10px);
    border-color: var(--nebula-pink);
    box-shadow: 0 25px 60px rgba(99, 102, 241, 0.4);
    background: rgba(255, 255, 255, 0.08);
}

.attraction-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.attraction-card:hover .attraction-image {
    transform: scale(1.1);
}

.attraction-card h3 {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    padding: 1.5rem 2rem 1rem;
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
}

.attraction-card p {
    color: #cbd5e1;
    font-size: 1rem;
    line-height: 1.7;
    padding: 0 2rem 2rem;
    margin: 0;
}

/* ─── Local Attractions Section ─── */
.local-attractions-section {
    margin: 5rem 0;
}

.local-attractions-section h2 {
    font-size: 2.5rem;
    color: white;
    font-weight: 800;
    margin-bottom: 3rem;
    text-align: center;
    font-family: "Space Grotesk", sans-serif;
    background: linear-gradient(135deg, #ffffff, #e0e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.local-attractions-section h2::after {
    content: "";
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 150px;
    height: 4px;
    background: linear-gradient(
        90deg,
        var(--primary-color),
        var(--secondary-color)
    );
    border-radius: 2px;
}

.attractions-list {
    list-style: none;
    padding: 0;
    margin-top: 2rem;
}

.attractions-list li {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(20px);
    border-radius: 15px;
    padding: 2rem;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-left: 4px solid var(--nebula-pink);
    transition: all 0.3s ease;
    animation: fadeInUp 0.8s ease-out;
}

.attractions-list li:hover {
    background: rgba(255, 255, 255, 0.08);
    transform: translateX(10px);
    box-shadow: 0 10px 30px rgba(99, 102, 241, 0.3);
}

.attractions-list strong {
    color: var(--nebula-pink);
    font-size: 1.2rem;
    display: block;
    margin-bottom: 0.7rem;
    font-family: "Space Grotesk", sans-serif;
}

.attractions-list p {
    color: #e2e8f0;
    font-size: 1.05rem;
    line-height: 1.8;
    margin: 0;
}

/* ============================================================
   FOOTER (matching home page)
   ============================================================ */
footer {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    color: white;
    padding: 3rem 2rem 2rem;
    text-align: center;
    margin-top: 0;
    border-top: 1px solid rgba(99, 102, 241, 0.3);
    animation: slideUp 0.5s ease-out 0.3s both;
    position: relative;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-section h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.social-links {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1rem;
}

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
    text-decoration: none;
}
.social-links a:hover {
    background: linear-gradient(
        135deg,
        var(--primary-color),
        var(--secondary-color)
    );
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(99, 102, 241, 0.4);
}

.footer-divider {
    height: 1px;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    margin: 2rem 0 1.5rem;
}

.footer-credit {
    font-size: 0.9rem;
    opacity: 0.8;
    color: #cbd5e1;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   MOBILE RESPONSIVE (≤ 768px)
   ============================================================ */
@media (max-width: 768px) {
    /* ─── Header padding ─── */
    header {
        padding: 0.85rem 0;
    }

    .navbar {
        padding: 0 1rem;
    }

    /* ─── Logo group – shrink logos ─── */
    .navbar-logo-group {
        gap: 0.75rem;
        margin-right: 0;
    }
    .iit-logo {
        height: 32px;
    }
    .logo {
        height: 42px;
    }

    /* ─── Show hamburger ─── */
    .hamburger {
        display: flex;
    }

    /* ─── Nav menu – full-width slide-down panel ─── */
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: rgba(15, 23, 42, 0.97);
        backdrop-filter: blur(24px);
        border-top: 1px solid rgba(99, 102, 241, 0.25);
        flex-direction: column;
        align-items: stretch;
        padding: 0;
        /* collapsed state */
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        transition:
            max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1),
            opacity 0.35s ease,
            padding 0.35s ease;
    }

    .nav-menu.open {
        max-height: 600px;
        opacity: 1;
        padding: 1rem 0 1.25rem;
    }

    /* ─── Nav links – stacked vertical list ─── */
    .navlinks {
        flex-direction: column;
        gap: 0;
        padding: 0 1.25rem;
    }

    .navlinks > li {
        border-bottom: 1px solid rgba(255, 255, 255, 0.07);
    }
    .navlinks > li:last-child {
        border-bottom: none;
    }

    .navlinks > li > a {
        display: flex;
        align-items: center;
        justify-content: space-between;
        width: 100%;
        padding: 0.85rem 0;
        font-size: 1rem;
        color: #e2e8f0;
    }
    .navlinks > li > a::after {
        display: none;
    }
    .navlinks > li > a:hover {
        transform: none;
        color: #fff;
    }

    /* show chevrons on mobile */
    .dropdown-arrow {
        display: inline-block;
        font-size: 0.7rem;
        color: #a5b4fc;
        transition: transform 0.3s ease;
    }

    .dropdown.open .dropdown-arrow {
        transform: rotate(180deg);
    }

    /* ─── Dropdown menu – accordion style ─── */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: hidden;
        transform: none;
        background: rgba(30, 27, 75, 0.7);
        border: none;
        border-radius: 10px;
        margin: 0.4rem 0 0.6rem;
        padding: 0.3rem 0;
        max-height: 0;
        overflow: hidden;
        transition:
            max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1),
            visibility 0.35s ease;
        box-shadow: none;
    }

    .dropdown.open .dropdown-menu {
        max-height: 300px;
        visibility: visible;
    }

    /* override desktop hover rule on mobile */
    .dropdown:hover .dropdown-menu {
        opacity: 1;
        visibility: hidden;
        transform: none;
    }
    .dropdown.open .dropdown-menu {
        visibility: visible;
    }

    .dropdown-menu a {
        padding: 0.7rem 1rem;
        color: #cbd5e1;
        font-size: 0.92rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    }
    .dropdown-menu a:hover {
        background: rgba(99, 102, 241, 0.15);
        color: #fff;
        padding-left: 1.2rem;
        transform: none;
    }

    /* ─── Registration button inside panel ─── */
    .registration-btn {
        display: block;
        width: calc(100% - 2.5rem);
        margin: 0.75rem 1.25rem 0;
        text-align: center;
        padding: 0.8rem 1rem;
        font-size: 0.95rem;
    }

    /* ─── City Guide Hero Mobile ─── */
    .city-guide-hero {
        padding: 5rem 1.25rem 3.5rem;
        min-height: auto;
    }

    .city-guide-hero h1 {
        font-size: 2.5rem;
        letter-spacing: -1px;
    }

    .city-guide-hero h2 {
        font-size: 1.1rem;
        line-height: 1.5;
    }

    /* ─── City Guide Content Mobile ─── */
    .city-guide-content {
        padding: 2.5rem 1.25rem;
    }

    .intro-section {
        padding: 1.5rem;
        margin-bottom: 2.5rem;
    }

    .intro-section p {
        font-size: 0.95rem;
        line-height: 1.7;
    }

    .attractions-container {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        margin: 2rem 0 3rem;
    }

    .attraction-card h3 {
        font-size: 1.3rem;
        padding: 1.2rem 1.5rem 0.8rem;
    }

    .attraction-card p {
        font-size: 0.93rem;
        padding: 0 1.5rem 1.5rem;
    }

    .local-attractions-section {
        margin: 3rem 0;
    }

    .local-attractions-section h2 {
        font-size: 1.8rem;
        margin-bottom: 2rem;
    }

    .local-attractions-section h2::after {
        width: 100px;
        height: 3px;
    }

    .attractions-list li {
        padding: 1.5rem;
        margin-bottom: 1rem;
    }

    .attractions-list li:hover {
        transform: translateX(5px);
    }

    .attractions-list strong {
        font-size: 1.05rem;
    }

    .attractions-list p {
        font-size: 0.93rem;
        line-height: 1.7;
    }

    /* ─── Footer Mobile ─── */
    footer {
        padding: 2rem 1.25rem 1.5rem;
    }

    .footer-section h3 {
        font-size: 1.2rem;
    }
}

/* ============================================================
   EXTRA-SMALL (≤ 360px)
   ============================================================ */
@media (max-width: 360px) {
    .iit-logo {
        height: 26px;
    }
    .logo {
        height: 34px;
    }

    .city-guide-hero h1 {
        font-size: 2rem;
    }

    .city-guide-hero h2 {
        font-size: 0.97rem;
    }

    .intro-section p {
        font-size: 0.88rem;
    }

    .attraction-card h3 {
        font-size: 1.15rem;
    }

    .attraction-card p {
        font-size: 0.88rem;
    }

    .local-attractions-section h2 {
        font-size: 1.5rem;
    }

    .attractions-list strong {
        font-size: 0.95rem;
    }

    .attractions-list p {
        font-size: 0.88rem;
    }
}