/* =========================================
   Base Variables & Themes
   ========================================= */
:root {
    /* DEFAULT DARK MODE (Untouched) */
    --bg-color: #0b0d11;
    --text-main: #e2e8f0;
    --text-muted: #94a3b8;
    --accent-purple: #8b5cf6;
    --accent-hover: #a78bfa;
    --card-bg: #161b22;
    --border-color: #1e293b;
    /* Variables added to handle header/hero overlays cleanly in both modes */
    --header-bg: rgba(11, 13, 17, 0.9);
    --nav-text: var(--text-main);
    --hero-overlay: radial-gradient(circle at center, rgba(139, 92, 246, 0.15) 0%, var(--bg-color) 80%);
    --hero-text: var(--text-main);
}

[data-theme="light"] {
    /* BRIGHT MODE (Eye-Relaxing & Purple Identity) */
    --bg-color: #F4F5F7;
    --text-main: #2D3748;
    --text-muted: #4A5568;
    --accent-purple: #6B46C1;
    --accent-hover: #553C9A;
    --card-bg: #FFFFFF;
    --border-color: #E2E8F0;
    --header-bg: rgba(90, 50, 163, 0.98);
    --nav-text: #FFFFFF;
    --hero-overlay: radial-gradient(circle at center, rgba(107, 70, 193, 0.4) 0%, rgba(45, 55, 72, 0.9) 100%);
    --hero-text: #FFFFFF;
}

/* =========================================
   Reset & Shared
   ========================================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', 'Segoe UI', Helvetica, Arial, sans-serif;
}

html {
    scroll-behavior: smooth;
}

section[id] {
    scroll-margin-top: 90px;
}

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Dim images/videos to reduce glare. Default behavior, disabled in light mode. */
img,
video {
    filter: brightness(0.85) contrast(1.05);
    transition: filter 0.3s ease;
}

img:hover,
.card:hover .card-img {
    filter: brightness(1) contrast(1);
}

/* Bright mode requires no dimming */
[data-theme="light"] img,
[data-theme="light"] video {
    filter: none;
}

/* Navigation */
header {
    padding: 1.5rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: var(--header-bg);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: background-color 0.3s ease;
    border-bottom: none;
}

.logo img {
    height: 30px;
    display: block;
    filter: none !important;
    /* Ensure logo is never dimmed */
    transition: all 0.3s ease;
}

nav ul {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav a {
    color: var(--nav-text);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

[data-theme="light"] nav a:hover {
    color: #D6BCFA;
    /* Lighter highlight for the deep purple header */
}

/* Theme Toggle Button */
.theme-btn {
    background: transparent;
    border: none;
    color: var(--nav-text);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: all 0.3s ease;
}

.theme-btn:hover {
    background-color: rgba(255, 255, 255, 0.1);
    transform: scale(1.1);
}

/* General Utilities */
.btn {
    display: inline-block;
    background-color: var(--accent-purple);
    color: #fff !important;
    /* Forces primary buttons to stay white text */
    padding: 0.8rem 2rem;
    border-radius: 4px;
    text-decoration: none;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

/* Secondary Button (View All Articles) */
.btn.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--accent-purple);
    color: var(--text-main) !important;
    /* Uses the dynamic text variable instead of forced white */
    transition: all 0.3s ease;
}

/* On hover, fill the button with purple and make text white */
.btn.btn-secondary:hover {
    background-color: var(--accent-purple);
    color: #ffffff !important;
}

[data-theme="light"] .btn.btn-secondary {
    border-color: var(--accent-purple);
    color: var(--accent-purple) !important;
    /* Pops nicely in light mode */
}

[data-theme="light"] .btn.btn-secondary:hover {
    background-color: var(--accent-purple);
    color: #ffffff !important;
}

/* =========================================
   Home Page Specific Styles
   ========================================= */
/* Hero Section */
.hero {
    position: relative;
    padding: 8rem 5%;
    text-align: center;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-video-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    pointer-events: none;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    background: var(--hero-overlay);
    transition: background 0.3s ease;
}

.hero-content {
    position: relative;
    z-index: 3;
    width: 100%;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    letter-spacing: -1px;
    color: var(--hero-text);
}

.hero h1 span {
    color: var(--accent-purple);
}

[data-theme="light"] .hero h1 span {
    color: #D6BCFA;
    /* Pops better against light mode overlay */
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem auto;
}

[data-theme="light"] .hero p {
    color: #E2E8F0;
    /* Keep text visible on overlay */
}

/* Logos Carousel */
.carousel-section {
    padding: 3rem 0;
    background-color: var(--card-bg);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
    overflow: hidden;
    position: relative;
    display: flex;
    align-items: center;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.carousel-section::before,
.carousel-section::after {
    content: "";
    position: absolute;
    top: 0;
    width: 150px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.carousel-section::before {
    left: 0;
    background: linear-gradient(to right, var(--card-bg) 0%, transparent 100%);
}

.carousel-section::after {
    right: 0;
    background: linear-gradient(to left, var(--card-bg) 0%, transparent 100%);
}

.carousel-track {
    display: flex;
    width: max-content;
    animation: scroll-logos 30s linear infinite;
}

.carousel-track:hover {
    animation-play-state: paused;
}

.carousel-track img {
    height: 45px;
    margin: 0 4rem;
    filter: grayscale(100%) opacity(0.5) brightness(0.85);
    transition: filter 0.3s ease, transform 0.3s ease;
    cursor: pointer;
}

[data-theme="light"] .carousel-track img {
    filter: grayscale(100%) opacity(0.5);
    /* No brightness dimming in light mode */
}

.carousel-track img:hover {
    filter: grayscale(0%) opacity(1) brightness(1);
    transform: scale(1.1);
}

@keyframes scroll-logos {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

/* Grid Sections & Cards */
.grid-section {
    padding: 5rem 5%;
}

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

.section-header h2 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.section-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
}

.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    position: relative;
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: border-color 0.3s ease, transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

[data-theme="light"] .card {
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.02);
}

.card:hover {
    border-color: var(--accent-purple);
    transform: translateY(-5px);
}

[data-theme="light"] .card:hover {
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.05);
}

.card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.card-content {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.card-icon {
    width: 50px;
    height: 50px;
    background-color: rgba(139, 92, 246, 0.15);
    color: var(--accent-purple);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.card:hover .card-icon {
    background-color: var(--accent-purple);
    color: #ffffff;
    transform: scale(1.05);
}

.card-icon svg {
    width: 26px;
    height: 26px;
}

.card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--text-main);
    line-height: 1.3;
}

.card p {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    flex-grow: 1;
    font-size: 0.95rem;
}

.tag {
    display: inline-block;
    background-color: rgba(139, 92, 246, 0.2);
    color: var(--accent-purple);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: bold;
    margin-bottom: 1rem;
    width: fit-content;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.read-more {
    color: var(--accent-purple);
    text-decoration: none;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s ease;
    font-size: 0.9rem;
}

.read-more:hover {
    gap: 0.8rem;
    text-decoration: underline;
}

/* Article Carousel */
.article-carousel-wrapper {
    position: relative;
    width: 100%;
    padding: 1rem 0;
}

.article-carousel-track {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    padding: 1rem 5%;
    scrollbar-width: none;
}

.article-carousel-track::-webkit-scrollbar {
    display: none;
}

.article-carousel-track .card {
    width: 380px;
    flex-shrink: 0;
    scroll-snap-align: center;
    cursor: pointer;
}

.article-carousel-track .card:hover {
    transform: none;
    border-color: var(--accent-purple);
}

.stretched-link::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1;
}

.carousel-dots {
    display: flex;
    justify-content: center;
    gap: 0.8rem;
    margin-top: 2rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background-color: var(--border-color);
    cursor: pointer;
    transition: all 0.3s ease;
}

.dot:hover {
    background-color: var(--text-muted);
}

.dot.active {
    background-color: var(--accent-purple);
    transform: scale(1.2);
}

.carousel-fade-left,
.carousel-fade-right {
    position: absolute;
    top: 0;
    width: 100px;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.carousel-fade-left {
    left: 0;
    background: linear-gradient(to right, var(--bg-color) 0%, transparent 100%);
}

.carousel-fade-right {
    right: 0;
    background: linear-gradient(to left, var(--bg-color) 0%, transparent 100%);
}

/* Contact Form */
.contact-section {
    padding: 5rem 5%;
    display: flex;
    justify-content: center;

}

.form-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 3rem;
    border-radius: 8px;
    width: 100%;
    max-width: 800px;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.form-container h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.form-sub {
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.input-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
    margin-bottom: 1.5rem;
}

.input-row .input-group {
    margin-bottom: 0;
}

label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-muted);
}

input,
select,
textarea {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.8rem 1rem;
    border-radius: 4px;
    font-size: 1rem;
    transition: border-color 0.3s ease, outline 0.3s ease, background-color 0.3s ease;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--accent-purple);
    background-color: var(--card-bg);
    /* Pops nicely in light mode */
}

select {
    appearance: none;
    cursor: pointer;
}

#submit-btn {
    background-color: var(--accent-purple);
    color: white;
    padding: 1rem 2rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.3s ease;
    margin-top: 1rem;
}

#submit-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
}

#submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

#status-message {
    margin-top: 1rem;
    text-align: center;
    font-size: 0.9rem;
}

/* Scroll Top & Footer */
.scroll-top-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background-color: var(--accent-purple);
    color: #ffffff;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease, background-color 0.3s ease;
    z-index: 999;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

[data-theme="light"] .scroll-top-btn {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
}

.scroll-top-btn.show {
    opacity: 1;
    visibility: visible;
}

.scroll-top-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-5px);
}

footer {
    text-align: center;
    padding: 2rem;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 2rem;
    background-color: var(--card-bg);
    /* Add background so it matches */
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

@media (max-width: 768px) {
    .input-row {
        flex-direction: column;
        gap: 1.5rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    nav ul,
    .carousel-fade-left,
    .carousel-fade-right {
        display: none;
    }

    .article-carousel-track .card {
        width: 85vw;
    }

    .scroll-top-btn {
        bottom: 20px;
        right: 20px;
    }
}