/* 
	Author : YADDEHIGE Kisandu Kawsika Ariyarathne
	Student ID : 10685969
	style.css 
	Date : 06/02/2026
	Time : 1350h
*/

/* ==========================================================================
   Global design tokens – richer luxury palette inspired by resort sites
   ========================================================================== */

:root {
    /* Deep midnight background */
    --color-bg: #03040a;
    /* Panel surfaces – warm charcoal */
    --color-surface: #10121a;
    --color-surface-alt: #181b25;

    /* Luxury accent – warm amber / gold */
    --color-accent: #f5c46b;
    --color-accent-soft: #ffdead;

    /* Text colours with soft contrast */
    --color-text: #f5f5f8;
    --color-text-muted: #a6acbf;

    --color-error: #ff6b6b;

    --font-body: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    --font-heading: "Playfair Display", "Georgia", "Times New Roman", serif;

    --space-xs: 0.35rem;
    --space-sm: 0.7rem;
    --space-md: 1.2rem;
    --space-lg: 2rem;
    --space-xl: 3.2rem;
    --space-xxl: 4.2rem;

    --radius-sm: 0.4rem;
    --radius-md: 1rem;
    --radius-pill: 999px;

    --transition-fast: 160ms ease-out;
    --transition-med: 260ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ==========================================================================
   Base + reset
   ========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font-body);
    background:
        radial-gradient(circle at top, #1c2138 0, #050615 35%, #02030a 70%, #000 100%);
    color: var(--color-text);
    line-height: 1.6;
}

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

a:hover,
a:focus-visible {
    color: var(--color-accent-soft);
}

:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

h1,
h2,
h3,
h4 {
    font-family: var(--font-heading);
    letter-spacing: 0.03em;
    margin-top: 0;
}

/* Visually hidden helper for accessible-only headings */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ==========================================================================
   Layout helpers
   ========================================================================== */

main {
    padding: var(--space-xl) var(--space-lg);
    max-width: 1140px;
    margin: 0 auto;
}

.section-header {
    margin-bottom: var(--space-md);
}

/* ==========================================================================
   Skip link
   ========================================================================== */

.skip-link {
    position: absolute;
    left: -999px;
    top: 0;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: #000;
    z-index: 1000;
    border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}

.skip-link:focus-visible {
    left: 0.5rem;
}

/* ==========================================================================
   Header + navigation with glassmorphism
   ========================================================================== */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(3, 4, 12, 0.9);
    backdrop-filter: blur(18px) saturate(130%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.main-nav {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0.55rem var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    font-weight: 600;
    font-size: 0.95rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--color-text);
}

.brand:hover,
.brand:focus-visible {
    color: var(--color-accent);
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 1.3rem;
    margin: 0;
    padding: 0;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.nav-links a[aria-current="page"] {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.nav-links a:hover,
.nav-links a:focus-visible {
    color: var(--color-accent-soft);
}

/* Basics dropdown – pure CSS, no JS */

.nav-dropdown {
    position: relative;
}

/* Basics top link */
.nav-dropdown > a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    padding-bottom: 0.25rem;
    border-bottom: 2px solid transparent;
    text-transform: uppercase;
    letter-spacing: 0.12em;
}

.nav-dropdown > a:hover,
.nav-dropdown > a:focus-visible {
    color: var(--color-accent-soft);
}

/* Submenu */
.nav-dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 11rem;
    list-style: none;
    margin: 0.35rem 0 0;
    padding: 0.35rem 0;
    background: radial-gradient(circle at top, #1d2336 0, #090b15 60%);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 22px 55px rgba(0, 0, 0, 0.85);
    display: none;
    z-index: 50;
}

/* Show submenu on hover or keyboard focus */
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu li a {
    display: block;
    padding: 0.45rem 0.9rem;
    font-size: 0.86rem;
    color: var(--color-text-muted);
}

.nav-dropdown-menu li a:hover,
.nav-dropdown-menu li a:focus-visible {
    color: var(--color-accent-soft);
    background: rgba(255, 255, 255, 0.03);
}

/* ==========================================================================
   Global cinematic background video
   ========================================================================== */

/* Container fixed to viewport, behind everything */
.bg-video {
    position: fixed;
    inset: 0;
    z-index: -2; /* keeps it behind header, main, footer */
    overflow: hidden;
    pointer-events: none; /* prevents accidental interaction */
}

/* Actual video fills screen, darkened and softened */
.bg-video__media {
    width: 100%;
    height: 100%;
    object-fit: cover;
    /* less blur and a brighter image */
    filter: blur(3px) brightness(1.0) saturate(1.1);
    transform: scale(1.02);
}

/* Extra overlay to keep text perfectly readable */
body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(circle at top, rgba(24, 30, 56, 0.45) 0, rgba(3, 4, 10, 0.72) 55%, rgba(0, 0, 0, 0.85) 100%);
    pointer-events: none;
}

/* ==========================================================================
   Hero – cinematic gradient & parallax image
   ========================================================================== */

.hero {
    margin-top: var(--space-xl);
    padding: var(--space-xl);
    border-radius: var(--radius-md);
    background:
        radial-gradient(circle at top left, #343b60 0, #171a2b 32%, #050615 72%, #02030a 100%);
    box-shadow: 0 30px 90px rgba(0, 0, 0, 0.9);
    overflow: hidden;
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--space-lg);
    align-items: center;
}

.hero-text h1 {
    font-size: 2.6rem;
    margin-bottom: var(--space-md);
}

.hero-text p {
    margin-bottom: var(--space-md);
    color: var(--color-text-muted);
}

.hero-subtext {
    font-size: 0.92rem;
    color: var(--color-text-muted);
}

/* parallax-style hover on hero image */
.hero-media img {
    width: 100%;
    border-radius: var(--radius-md);
    object-fit: cover;
    filter: grayscale(15%) contrast(1.15) saturate(0.9);
    transform: translateY(14px) scale(1.06);
    transform-origin: center;
    transition:
        transform var(--transition-med),
        filter 260ms ease-out;
}

.hero-media img:hover {
    transform: translateY(0) scale(1.09);
    filter: grayscale(0) contrast(1.08) saturate(1.05);
}

/* ==========================================================================
   Buttons – pill-shaped with sheen
   ========================================================================== */

.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.6rem;
    border-radius: var(--radius-pill);
    border: none;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    transition:
        background 220ms ease-out,
        transform 160ms ease-out,
        box-shadow 220ms ease-out;
}

.primary-btn {
    background: linear-gradient(135deg, #f8d890 0, #f5c46b 45%, #f9e2ac 100%);
    color: #221506;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.8);
    transform: translateY(0);
}

.primary-btn:hover,
.primary-btn:focus-visible {
    transform: translateY(-2px);
    box-shadow: 0 22px 52px rgba(0, 0, 0, 0.95);
}

/* subtle sheen animation */
.hero .primary-btn::after {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: inherit;
    background: linear-gradient(
        120deg,
        transparent 0,
        rgba(255, 255, 255, 0.45) 42%,
        transparent 70%
    );
    opacity: 0;
    transform: translateX(-120%);
    pointer-events: none;
}

.hero .primary-btn:hover::after {
    animation: buttonSheen 700ms ease-out;
}

/* text CTA */
.text-link {
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* ==========================================================================
   Module overview cards – deeper depth & hover
   ========================================================================== */

.module-overview {
    margin-top: var(--space-xxl);
}

.module-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: var(--space-md);
}

.module-card {
    background: radial-gradient(circle at top, #262a43 0, #111321 45%, #080914 100%);
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid rgba(255, 255, 255, 0.05);
    box-shadow: 0 20px 52px rgba(0, 0, 0, 0.9);
    transform: translateY(0) translateZ(0);
    transition:
        transform var(--transition-med),
        box-shadow 260ms ease-out,
        border-color 220ms ease-out;
}

.module-card:hover {
    transform: translateY(-12px) translateZ(0);
    border-color: rgba(245, 196, 107, 0.6);
    box-shadow: 0 32px 80px rgba(0, 0, 0, 1);
}

.module-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
}

.module-card-body {
    padding: var(--space-md);
}

.module-card-body h3 {
    margin-bottom: 0.4rem;
}

.module-card-body p {
    margin-top: 0;
    margin-bottom: var(--space-sm);
    color: var(--color-text-muted);
}

/* ==========================================================================
   Learning outcomes + section underline animation
   ========================================================================== */

.learning-outcomes {
    margin-top: var(--space-xxl);
}

.outcome-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-md);
}

.outcome-item {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

/* give sections animated “light bar” at bottom */
.learning-outcomes,
.external-preview,
.resource-section,
.module-next-step {
    position: relative;
}

.learning-outcomes::before,
.external-preview::before,
.resource-section::before,
.module-next-step::before {
    content: "";
    position: absolute;
    left: 0;
    bottom: -1px;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.4;
    transform: scaleX(0);
    transform-origin: center;
    animation: sectionUnderline 700ms ease-out forwards;
}

/* ==========================================================================
   External/Resources lists
   ========================================================================== */

.external-preview,
.resource-section {
    margin-top: var(--space-xxl);
}

.external-links-list,
.resource-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.external-links-list li,
.resource-list li {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    margin-bottom: var(--space-sm);
}

.external-note,
.resource-description {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: 0.3rem;
}

/* ==========================================================================
   Module pages shared styles
   ========================================================================== */

.module-hero {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
    padding: var(--space-xl);
    background:
        radial-gradient(circle at top right, #3b4269 0, #181b2a 40%, #050615 80%);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 26px 80px rgba(0, 0, 0, 0.95);
}

.module-hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: var(--space-lg);
    align-items: center;
}

.module-kicker {
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.72rem;
    color: var(--color-accent-soft);
    margin-bottom: var(--space-xs);
}

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

.module-hero-media img {
    width: 100%;
    border-radius: var(--radius-md);
    object-fit: cover;
    filter: grayscale(12%);
}

/* in-page TOC */
.module-toc {
    margin-bottom: var(--space-lg);
    padding: var(--space-sm) var(--space-md);
    background: rgba(5, 7, 18, 0.9);
    border-radius: var(--radius-md);
    border: 1px dashed rgba(255, 255, 255, 0.12);
}

.module-toc-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    color: var(--color-text-muted);
}

.module-toc ul {
    list-style: none;
    margin: 0.4rem 0 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem 1.4rem;
}

.module-toc a {
    font-size: 0.88rem;
    position: relative;
    padding-bottom: 0.15rem;
}

.module-toc a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 190ms ease-out;
}

.module-toc a:hover::after,
.module-toc a:focus-visible::after {
    width: 100%;
}

/* module content blocks */
.module-content {
    display: grid;
    gap: var(--space-lg);
}

.content-block {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.content-block header {
    margin-bottom: var(--space-sm);
}

.content-two-column {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: var(--space-lg);
    align-items: center;
}

.content-reverse {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
}

/* shared image hover for module + contact */
.content-media img,
.contact-aside img {
    width: 100%;
    border-radius: var(--radius-md);
    object-fit: cover;
    transform: scale(1.01);
    transition:
        transform 260ms cubic-bezier(0.22, 0.61, 0.36, 1),
        filter 260ms ease-out;
}

.content-media img:hover,
.contact-aside img:hover {
    transform: scale(1.04);
    filter: brightness(1.06);
}

.practice-callout {
    margin-top: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    background: rgba(245, 196, 107, 0.08);
    border-left: 3px solid var(--color-accent);
}

/* highlight blocks */
.highlight-block {
    border-left: 4px solid var(--color-accent);
    background: linear-gradient(135deg, #1d2234, #0c0f1a);
}

/* videos */
.video-wrapper {
    position: relative;
    padding-bottom: 56.25%;
    height: 0;
    overflow: hidden;
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 18px 52px rgba(0, 0, 0, 0.98);
}

.video-wrapper iframe {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
}

.module-next-step {
    margin-top: var(--space-xl);
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
    background: #080a13;
}

/* ==========================================================================
   Contact layout
   ========================================================================== */

.page-header {
    margin-top: var(--space-xl);
    margin-bottom: var(--space-lg);
}

.page-header p {
    max-width: 620px;
    color: var(--color-text-muted);
}

.contact-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: var(--space-lg);
    align-items: flex-start;
}

.contact-form {
    background: var(--color-surface);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.form-group {
    margin-bottom: var(--space-md);
}

label {
    display: block;
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
}

input,
textarea,
select {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-sm);
    border: 1px solid #313552;
    background: #050613;
    color: var(--color-text);
    font-family: inherit;
    font-size: 0.95rem;
}

input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    border-color: var(--color-accent);
}

textarea {
    resize: vertical;
}

.contact-alt {
    margin-top: var(--space-md);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
    margin-top: var(--space-xl);
    padding: var(--space-md) var(--space-lg) var(--space-xl);
    text-align: center;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    color: var(--color-text-muted);
    font-size: 0.85rem;
}

/* ==========================================================================
   Cinematic animation system
   ========================================================================== */

@keyframes fadeInUpSoft {
    from {
        opacity: 0;
        transform: translate3d(0, 20px, 0);
        filter: blur(3px);
    }
    to {
        opacity: 1;
        transform: translate3d(0, 0, 0);
        filter: blur(0);
    }
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.96) translateY(14px);
    }
    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

@keyframes glowPulse {
    0% {
        box-shadow: 0 16px 40px rgba(0, 0, 0, 0.9);
    }
    50% {
        box-shadow: 0 22px 64px rgba(245, 196, 107, 0.55);
    }
    100% {
        box-shadow: 0 16px 40px rgba(0, 0, 0, 0.9);
    }
}

@keyframes buttonSheen {
    0% {
        opacity: 0;
        transform: translateX(-120%);
    }
    20% {
        opacity: 1;
    }
    100% {
        opacity: 0;
        transform: translateX(140%);
    }
}

@keyframes sectionUnderline {
    from {
        transform: scaleX(0);
        opacity: 0;
    }
    to {
        transform: scaleX(1);
        opacity: 0.4;
    }
}

/* apply animations */
.hero {
    animation: fadeInScale 520ms ease-out both;
}

.module-hero {
    animation: fadeInScale 520ms ease-out both;
}

.module-card,
.outcome-item,
.content-block {
    animation: fadeInUpSoft 520ms ease-out both;
}

.module-card:nth-child(2),
.outcome-item:nth-child(2),
.content-block:nth-of-type(2) {
    animation-delay: 90ms;
}

.module-card:nth-child(3),
.outcome-item:nth-child(3),
.content-block:nth-of-type(3) {
    animation-delay: 160ms;
}

/* CTA glow */
.hero .primary-btn {
    animation: glowPulse 3600ms ease-in-out infinite;
}

/* reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
        scroll-behavior: auto !important;
    }

    .bg-video {
        display: none;
    }
}

/* ==========================================================================
   Responsive tweaks
   ========================================================================== */

@media (max-width: 900px) {
    main {
        padding-inline: var(--space-md);
    }

    .hero,
    .module-hero {
        padding: var(--space-lg);
    }

    .hero-inner,
    .module-hero-inner,
    .content-two-column,
    .contact-layout {
        grid-template-columns: 1fr;
    }

    .module-toc ul {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 640px) {
    .main-nav {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.4rem;
    }

    .nav-links {
        flex-wrap: wrap;
        gap: 0.5rem 1rem;
    }

    .hero-text h1 {
        font-size: 2.1rem;
    }
}