/* ============================================
   MSP ALUMNI NETWORK — SHARED STYLES
   Common variables, reset, typography, and base
   header/logo structure used across all pages.
   ============================================ */

/* ---- CSS Variables (UM Branding) ---- */
:root {
    --um-dark-blue: #001C3D;
    --um-darker-blue: #00101f;
    --um-light-blue: #00A2DB;
    --um-light-blue-glow: rgba(0, 162, 219, 0.4);
    --um-orange: #E84E10;
    --um-orange-glow: rgba(232, 78, 16, 0.4);
    --um-white: #FFFFFF;
    --um-off-white: #fafbfc;
    --um-gray-50: #f8fafc;
    --um-gray-100: #f1f5f9;
    --um-gray-200: #e2e8f0;
    --um-gray-300: #cbd5e1;
    --um-gray-400: #94a3b8;
    --um-gray-500: #64748b;
    --um-gray-600: #475569;
    --um-gray-700: #334155;
    --um-gray-800: #1e293b;

    --font-heading: 'Space Grotesk', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04), 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08), 0 8px 24px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.1), 0 16px 48px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 40px rgba(0,0,0,0.12), 0 30px 60px rgba(0,0,0,0.1);
    --shadow-glow-blue: 0 0 40px rgba(0, 162, 219, 0.15);
    --shadow-glow-orange: 0 0 40px rgba(232, 78, 16, 0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ---- Base Typography ---- */
body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--um-dark-blue);
    background: var(--um-white);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.15;
    letter-spacing: -0.02em;
}

a {
    color: var(--um-light-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--um-orange);
}

img {
    max-width: 100%;
    height: auto;
}

/* ---- Base Logo ---- */
.logo {
    display: flex;
    align-items: center;
    gap: 14px;
    text-decoration: none;
}

.logo-img {
    height: 44px;
    width: auto;
    transition: transform var(--transition-smooth);
}

.logo:hover .logo-img {
    transform: scale(1.02);
}

.logo-text h1 {
    font-size: 15px;
    font-weight: 700;
    color: var(--um-dark-blue);
    margin: 0;
    line-height: 1.2;
}

.logo-text p {
    font-size: 11px;
    color: var(--um-gray-500);
    margin: 0;
    font-weight: 500;
}

/* ---- Base Header Layout ---- */
header {
    padding: 0 50px;
    height: 72px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-smooth);
}

/* ---- Base Nav ---- */
.header-nav {
    display: flex;
    gap: 6px;
    align-items: center;
}

.header-nav a {
    font-size: 14px;
    font-weight: 500;
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.header-nav .btn-cta {
    background: linear-gradient(135deg, var(--um-orange) 0%, #d94008 100%);
    color: white;
    margin-left: 12px;
    box-shadow: 0 2px 8px rgba(232, 78, 16, 0.25);
    border: none;
}

.header-nav .btn-cta:hover {
    background: linear-gradient(135deg, #ff5a1f 0%, var(--um-orange) 100%);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(232, 78, 16, 0.35);
    color: white;
}

/* ---- Mobile Hamburger Menu ---- */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1002;
    position: relative;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--um-dark-blue);
    border-radius: 2px;
    transition: all 0.3s ease;
}

.menu-toggle span + span {
    margin-top: 6px;
}

/* When header is on a dark background page, make bars white */
header.scrolled .menu-toggle span,
.dark-header .menu-toggle span {
    background: white;
}

/* Animate to X when open */
.menu-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 6px);
}

.menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -6px);
}

/* Mobile overlay always uses dark bars in X state */
.menu-toggle.open span {
    background: var(--um-dark-blue);
}

@media (max-width: 900px) {
    .menu-toggle {
        display: block;
    }

    .header-nav {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 8px;
        z-index: 1001;
        padding: 80px 40px 40px;
    }

    .header-nav.open {
        display: flex;
    }

    .header-nav a {
        font-size: 20px;
        font-weight: 600;
        padding: 14px 32px;
        color: var(--um-dark-blue);
        border-radius: var(--radius-md);
        width: 100%;
        max-width: 320px;
        text-align: center;
    }

    .header-nav a:hover {
        background: var(--um-gray-100);
        color: var(--um-dark-blue);
    }

    .header-nav a.active {
        color: var(--um-light-blue);
    }

    .header-nav .btn-cta {
        margin-left: 0;
        margin-top: 12px;
    }

    /* country.html uses .back-link instead of nav */
    .back-link {
        font-size: 13px !important;
    }
}