/* =========================================================
   GLOBAL + AI STUDY ASSISTANT — UNIFIED CSS
   (Duplicates merged, NOTHING removed)
   ========================================================= */

/* ===== GOOGLE FONTS ===== */
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Playfair+Display:wght@700;800&display=swap');

/* ===== CSS VARIABLES (UNION) ===== */
:root {
    --primary:        #2f62d0;
    --secondary:      #07c4f8;
    --primary-dark:   #244fb0;
    --secondary-dark: #05a7d4;

--accent:  #4f7df3;
--accent2: #5ee7ff;

    --bg-main:        #f4f7ff;
    --bg-section:     #eef4ff;
    --bg-dark:        #0d1b3e;

    --text-main:      #1f2937;
    --text-muted:     #4b5563;
    --text-light:     #9ca3af;

    --border-soft:    #dbe4ff;
    --card-bg:        #ffffff;

    --shadow-sm:      0 2px 12px rgba(47,98,208,0.08);
    --shadow-md:      0 8px 32px rgba(47,98,208,0.14);
    --shadow-lg:      0 20px 60px rgba(47,98,208,0.18);

    --radius-sm:      8px;
    --radius:         16px;
    --radius-lg:      24px;
    --radius-xl:      32px;

    --transition:     0.4s cubic-bezier(0.25,0.8,0.25,1);
}

/* ===== RESET + BASE ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}



html { 
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
    overflow-y: scroll;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    color: var(--text-main);
    background: var(--bg-main);
    line-height: 1.7;
    overflow-x: hidden;
    width: 100%;
}

/* Prevent scrollbar shift by maintaining scrollbar space */
body.modal-open,
body.dropdown-open {
    overflow-y: scroll;
}


img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-section); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }

/* ===== NOISE OVERLAY ===== */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.4;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
}

/* ===== CONTAINER ===== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== HEADER / NAVBAR (UNION) ===== */
header {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-soft);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: box-shadow var(--transition);
    width: 100%;
}
header.scrolled { box-shadow: var(--shadow-md); }

header .container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo span {
    color: var(--accent);
    -webkit-text-fill-color: var(--accent);
}

/* ===== NAV MENU ===== */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    align-items: center;
}

.nav-menu > li > a {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
    position: relative;
    transition: color var(--transition);
}

/* underline for dropdown parent also */
.nav-menu > li > .dropdown-toggle {
    position: relative;
}

.nav-menu > li > .dropdown-toggle::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}

/* active underline */
.nav-menu > li > a.active::after,
.nav-menu > li > .dropdown-toggle.active::after {
    width: 100%;
}


.nav-menu > li > a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}

.nav-menu > li > a:hover {
    color: var(--primary);
}
.nav-menu > li > a:hover::after { width: 100%; }

/* ===== DROPDOWN (UNION) ===== */
.nav-dropdown { position: relative; }

.dropdown-toggle {
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.3rem;
}
.dropdown-toggle::before {
    content: '▾';
    font-size: 0.75rem;
    transition: transform 0.3s;
}
.nav-dropdown:hover .dropdown-toggle::before {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 130%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 220px;
    background: #fff;
    border: 1px solid var(--border-soft);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
    padding: 0.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition);
    z-index: 2000;
}

.nav-dropdown:hover .dropdown-menu,
.nav-dropdown:focus-within .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-menu li { list-style: none; }

.dropdown-menu a {
    display: block;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
    font-weight: 600;
    border-radius: 10px;
    transition: all 0.2s;
}
.dropdown-menu a:hover {
    background: var(--bg-section);
    color: var(--primary);
    padding-left: 1.4rem;
}

/* ===== BUTTONS (UNION) ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    position: relative;
    overflow: hidden;
    transition: all var(--transition);
}

.btn::before {
    content: '';
    position: absolute;
    inset: 0;
    background: rgba(255,255,255,0.15);
    transform: translateX(-100%) skewX(-20deg);
    transition: transform 0.5s;
}
.btn:hover::before {
    transform: translateX(100%) skewX(-20deg);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    box-shadow: 0 4px 20px rgba(47,98,208,0.4);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(47,98,208,0.5);
}

.btn-secondary {
background: linear-gradient(135deg,  var(--primary));
    color: #fff;
    box-shadow: 0 4px 20px rgba(47,98,208,0.4);
}
.btn-secondary:hover {

    color: #fff;
    transform: translateY(-3px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent2));
    color: #fff;
    box-shadow: 0 4px 20px rgba(255,107,53,0.35);
}
.btn-accent:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(255,107,53,0.5);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1.05rem;
}

/* ===== SECTION ===== */

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 2rem;
}

.section-label {
    display: block;
    text-align: center;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* ===== CARD (UNION) ===== */
.card {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}
.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}
.card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    font-size: 1.3rem;
}
.card p { color: var(--text-muted); }

/* ===== FORM ===== */
.form-group { margin-bottom: 1.5rem; }

.form-group label {
    display: block;
    font-weight: 500;
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-soft);
    font-family: inherit;
}

/* ===== EFFECTS ===== */
.particles,
.stars {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    opacity: 0;
    animation: floatParticle linear infinite;
}

@keyframes floatParticle {
    0%   { transform: translateY(100vh) rotate(0deg); opacity: 0; }
    10%  { opacity: 0.6; }
    90%  { opacity: 0.6; }
    100% { transform: translateY(-100px) rotate(720deg); opacity: 0; }
}

.star {
    position: absolute;
    background: #fff;
    border-radius: 50%;
    animation: twinkle ease-in-out infinite;
}

@keyframes twinkle {
    0%,100% { opacity: 0.1; transform: scale(0.8); }
    50%     { opacity: 1; transform: scale(1.3); }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }
}