/* ============================================
   TH MANAGEMENT - Engineering Blueprint Theme
   Järnvägsprojektering med Precision
   ============================================ */

/* ---------- CSS Variables ---------- */
:root {
    --bg-primary: #0a1b2f;
    --bg-secondary: #0d2240;
    --bg-card: #112a45;
    --bg-card-hover: #153352;
    --accent: #00bcd4;
    --accent-light: #4dd0e1;
    --accent-dark: #0097a7;
    --text-primary: #e0e6ed;
    --text-secondary: #8a9bb5;
    --text-muted: #5a6f8a;
    --border-color: rgba(0, 188, 212, 0.2);
    --border-hover: rgba(0, 188, 212, 0.5);
    --grid-line: rgba(0, 188, 212, 0.06);
    --white: #ffffff;
    --error: #ef5350;
    --success: #66bb6a;
    --font-primary: 'Inter', 'Montserrat', 'Roboto', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.4);
    --radius: 4px;
    --radius-lg: 8px;
    --transition: 0.3s ease;
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 70px;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

/* Blueprint grid background */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(var(--grid-line) 1px, transparent 1px),
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
    background-size: 40px 40px;
    pointer-events: none;
    z-index: 0;
}

body > * {
    position: relative;
    z-index: 1;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--accent-light);
}

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

ul, ol {
    list-style: none;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--white);
}

h1 { font-size: 2.8rem; letter-spacing: 2px; }
h2 { font-size: 2rem; letter-spacing: 1.5px; }
h3 { font-size: 1.4rem; letter-spacing: 1px; }
h4 { font-size: 1.1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.text-accent { color: var(--accent); }
.text-muted { color: var(--text-muted); }

/* ---------- Utility ---------- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    text-transform: uppercase;
    position: relative;
    display: inline-block;
    padding-bottom: 0.75rem;
}

.section-header h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 2px;
    background: var(--accent);
}

.section-header p {
    margin-top: 1rem;
    font-size: 1.05rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Technical annotation style */
.annotation {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 2px;
}

/* Emphasize organization numbers */
.org-num {
    font-weight: 700;
}

/* ---------- Header / Navigation ---------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 27, 47, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all var(--transition);
}

.header.scrolled {
    background: rgba(10, 27, 47, 0.98);
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 84px;
    overflow: visible;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--white);
    letter-spacing: 2px;
    text-transform: uppercase;
    height: 84px;
}

/* Image banner for navbar left */
.logo-banner {
    position: static;
    height: 120px;
    width: auto;
    display: block;
}


.logo-icon {
    width: 36px;
    height: 36px;
    border: 2px solid var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.85rem;
    color: var(--accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav a {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    position: relative;
    padding: 0.25rem 0;
    transition: color var(--transition);
}

.nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--accent);
    transition: width var(--transition);
}

.nav a:hover,
.nav a.active {
    color: var(--accent);
}

.nav a:hover::after,
.nav a.active::after {
    width: 100%;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 5px;
    background: none;
    border: none;
}

.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ---------- Hero Section ---------- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 6rem 2rem 4rem;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 620px;
    height: 620px;
    border: 8px solid var(--border-color); /* match squares/grid lines color */
    border-radius: 50%;
    opacity: 0.9;
    animation: pulse-ring 3.6s ease-in-out infinite;
    box-shadow: 0 0 24px rgba(0,188,212,0.08);
}

.hero::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 420px;
    height: 420px;
    border: 8px solid var(--border-color); /* match squares/grid lines color */
    border-radius: 50%;
    opacity: 0.8;
    animation: pulse-ring 3.6s ease-in-out infinite 0.9s;
    box-shadow: 0 0 18px rgba(0,188,212,0.06);
}

@keyframes pulse-ring {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
    50% { transform: translate(-50%, -50%) scale(1.05); opacity: 0.1; }
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-annotation {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--accent);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-top: 1.2rem;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.2s;
}

.hero h1 {
    font-size: 3.2rem;
    font-weight: 700;
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--white) 0%, var(--accent-light) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.4s;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.6s;
}

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

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    border: 1px solid var(--accent);
    color: var(--accent);
    background: transparent;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--accent);
    transition: left var(--transition);
    z-index: -1;
}

.btn:hover {
    color: var(--bg-primary);
    border-color: var(--accent);
}

.btn:hover::before {
    left: 0;
}

.btn-primary {
    background: var(--accent);
    color: var(--bg-primary);
}

.btn-primary::before {
    background: var(--accent-light);
}

.hero .btn {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards 0.8s;
}

/* ---------- Cards Grid ---------- */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2.5rem 2rem;
    position: relative;
    transition: all var(--transition);
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity var(--transition);
}

.card:hover {
    border-color: var(--border-hover);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--accent);
    margin-bottom: 1.5rem;
    color: var(--accent);
    font-size: 1.3rem;
}

.card-number {
    font-family: var(--font-mono);
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.card h3 {
    margin-bottom: 1rem;
    text-transform: uppercase;
    font-size: 1.1rem;
}

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

.card .read-more {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent);
    transition: gap var(--transition);
}

.card .read-more:hover {
    gap: 0.75rem;
}

/* ---------- Blueprint Frame ---------- */
.blueprint-frame {
    border: 1px solid var(--border-color);
    position: relative;
    padding: 2rem;
}

.blueprint-frame::before,
.blueprint-frame::after {
    content: '+';
    position: absolute;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--border-hover);
}

.blueprint-frame::before {
    top: -8px;
    left: -8px;
}

.blueprint-frame::after {
    bottom: -8px;
    right: -8px;
}

/* ---------- Project Cards ---------- */
.project-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    overflow: hidden;
    transition: all var(--transition);
}

.project-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.project-card .project-image {
    width: 100%;
    height: 200px;
    background: var(--bg-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.project-card .project-image::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 50%;
    background: linear-gradient(to top, var(--bg-card), transparent);
}

.project-card .project-body {
    padding: 1.5rem;
}

.project-card .project-category {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 0.75rem;
}

.project-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
}

.project-card .project-meta {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.project-card .project-meta span {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

/* ---------- News Cards ---------- */
.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2rem;
    transition: all var(--transition);
}

.news-card:hover {
    border-color: var(--border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow);
}

.news-card .news-date {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--accent);
    letter-spacing: 2px;
    margin-bottom: 1rem;
}

.news-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.75rem;
}

.news-card p {
    font-size: 0.9rem;
}

/* ---------- Sustainability ---------- */
.sustainability-item {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-color);
}

.sustainability-item:last-child {
    border-bottom: none;
}

.sustainability-icon {
    flex-shrink: 0;
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--accent);
    color: var(--accent);
    font-size: 1.5rem;
}

.sustainability-content h3 {
    margin-bottom: 0.5rem;
}

/* ---------- Contact Form ---------- */
.contact-section {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info h3 {
    margin-bottom: 1.5rem;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.contact-info-icon {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-color);
    color: var(--accent);
    font-size: 0.9rem;
}

.contact-info-item h4 {
    margin-bottom: 0.25rem;
    font-size: 0.9rem;
}

.contact-info-item p {
    font-size: 0.9rem;
    margin: 0;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.85rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    transition: border-color var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
}

.form-group textarea {
    min-height: 140px;
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

.form-message {
    padding: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(102, 187, 106, 0.1);
    border: 1px solid var(--success);
    color: var(--success);
}

.form-message.error {
    display: block;
    background: rgba(239, 83, 80, 0.1);
    border: 1px solid var(--error);
    color: var(--error);
}

/* ---------- Page Header ---------- */
.page-header {
    padding: 8rem 0 3rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.page-header .annotation {
    margin-bottom: 0.75rem;
    display: block;
}

.page-header h1 {
    font-size: 2.4rem;
    text-transform: uppercase;
}

.page-header p {
    margin-top: 1rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- Category Filter ---------- */
.filter-bar {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
}

.filter-btn {
    padding: 0.5rem 1.25rem;
    font-family: var(--font-primary);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--accent);
    border-color: var(--accent);
    background: rgba(0, 188, 212, 0.05);
}

/* ---------- Footer ---------- */
.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 3rem 0 1.5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand .logo {
    margin-bottom: 1rem;
}

.footer-brand p {
    font-size: 0.9rem;
    max-width: 350px;
}

.footer h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1rem;
    color: var(--accent);
}

.footer-links a {
    display: block;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 0.25rem 0;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-contact p {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.footer-bottom {
    border-top: 1px solid var(--border-color);
    padding-top: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin: 0;
}

/* ---------- Loading Spinner ---------- */
.loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem;
}

.spinner {
    width: 100px;
    height: 100px;
    border: 20px solid rgba(255,107,0,0.18);
    border-top-color: #ff6b00; /* strong, high-contrast accent */
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    box-shadow: 0 0 12px rgba(255,107,0,0.14);
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ---------- Scroll Animations ---------- */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.fade-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    /* Show mobile menu earlier and scale nav links down */
    .menu-toggle {
        display: flex;
    }

    /* Mobile-style nav for tablets and small desktops */
    .nav {
        position: fixed;
        top: 100px; /* below the header */
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(10, 27, 47, 0.98);
        backdrop-filter: blur(12px);
        padding: 2rem;
        gap: 1.25rem;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.4s ease;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav a {
        font-size: 0.95rem;
    }

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

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
}

@media (max-width: 768px) {
    html { font-size: 15px; }

    .header .container { min-height: 80px; padding: 0.45rem 1rem; }
    .logo { height: auto; min-width: 0; }
    .logo-banner { position: static; transform: none; max-height: 90px; max-width: calc(100vw - 5rem); height: auto; object-fit: contain; }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        flex-direction: column;
        background: rgba(10, 27, 47, 0.98);
        backdrop-filter: blur(12px);
        padding: 2rem;
        gap: 1.5rem;
        border-bottom: 1px solid var(--border-color);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: all 0.4s ease;
    }

    .nav.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .hero h1 {
        font-size: 2rem;
        letter-spacing: 2px;
    }

    .hero p {
        font-size: 1rem;
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }

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

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 0.75rem;
        text-align: center;
    }

    .sustainability-item {
        flex-direction: column;
        gap: 1rem;
    }

    .section {
        padding: 3rem 0;
    }

    .page-header {
        padding: 6rem 0 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero h1 {
        font-size: 1.6rem;
    }

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

    .filter-bar {
        gap: 0.5rem;
    }

    .filter-btn {
        font-size: 0.65rem;
        padding: 0.4rem 0.75rem;
    }

    .header .container { min-height: 60px; padding: 0.35rem 1rem; }
    .logo { height: auto; min-width: 0; }
    .logo-banner { position: static; transform: none; max-height: 64px; max-width: calc(100vw - 5rem); height: auto; object-fit: contain; }
}