/* ============================================
   LUXURY PRESENTATIONS EVENING
   Professional, Elegant, Premium Design
   ============================================ */

/* Color Palette - Luxury */
:root {
    --gold: #D4AF37;
    --dark-gold: #B8941F;
    --cream: #F5F1E8;
    --dark-bg: #0A0A0A;
    --charcoal: #1A1A1A;
    --light-gray: #E8E8E8;
    --text-primary: #F5F1E8;
    --text-secondary: #A0A0A0;
    --accent: #8B7355;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-primary);
    font-family: 'Playfair Display', 'Georgia', serif;
    line-height: 1.8;
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* Subtle Film Grain Texture */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('data:image/svg+xml;utf8,<svg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"><filter id="noise"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="4" stitchTiles="stitch"/></filter><rect width="100%" height="100%" filter="url(%23noise)" opacity="0.05"/></svg>');
    pointer-events: none;
    opacity: 0.3;
    z-index: 9999;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

.luxury-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    letter-spacing: 0.05em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    position: relative;
}

.title-line {
    display: block;
    background: linear-gradient(135deg, var(--gold) 0%, var(--cream) 50%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    font-weight: 300;
    color: var(--text-secondary);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    font-family: 'Montserrat', 'Arial', sans-serif;
}

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

.hero {
    text-align: center;
    padding: 8rem 0 4rem;
    position: relative;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.divider {
    width: 100px;
    height: 1px;
    background: linear-gradient(to right, transparent, var(--gold), transparent);
    margin: 3rem auto;
    animation: glow-pulse 2s ease-in-out infinite;
}

@keyframes glow-pulse {
    0%, 100% {
        box-shadow: 0 0 5px var(--gold);
        opacity: 0.6;
    }
    50% {
        box-shadow: 0 0 20px var(--gold);
        opacity: 1;
    }
}

/* ============================================
   NAVIGATION CARDS
   ============================================ */

.main-nav {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 2rem 0;
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    width: 100%;
}

.luxury-card {
    position: relative;
    padding: 4rem 3rem;
    background: linear-gradient(135deg,
        rgba(212, 175, 55, 0.03) 0%,
        rgba(26, 26, 26, 0.8) 50%,
        rgba(212, 175, 55, 0.03) 100%);
    border: 1px solid rgba(212, 175, 55, 0.2);
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.luxury-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
        rgba(212, 175, 55, 0.1) 0%,
        transparent 50%);
    opacity: 0;
    transition: opacity 0.6s ease;
}

.luxury-card::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(45deg,
        var(--gold),
        var(--dark-gold),
        var(--gold));
    z-index: -1;
    opacity: 0;
    transition: opacity 0.6s ease;
}

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

.luxury-card:hover::after {
    opacity: 1;
    animation: border-glow 2s linear infinite;
}

@keyframes border-glow {
    0%, 100% { filter: blur(10px) brightness(1); }
    50% { filter: blur(15px) brightness(1.5); }
}

.luxury-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 60px rgba(212, 175, 55, 0.3);
    border-color: var(--gold);
}

.card-number {
    font-size: 4rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    color: var(--gold);
    margin-bottom: 1rem;
    transition: transform 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.luxury-card:hover .card-number {
    transform: scale(1.05);
}

.card-label {
    font-size: 1rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-family: 'Montserrat', 'Arial', sans-serif;
    font-weight: 300;
    margin-bottom: 2rem;
    transition: color 0.6s ease;
}

.luxury-card:hover .card-label {
    color: var(--cream);
}

.card-arrow {
    display: flex;
    justify-content: flex-end;
    color: var(--gold);
    opacity: 0.7;
    transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.luxury-card:hover .card-arrow {
    opacity: 1;
    transform: translateX(10px);
}

/* ============================================
   PAGE HEADER & NAVIGATION
   ============================================ */

.page-header {
    padding: 4rem 0 2rem;
    text-align: center;
}

.page-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 300;
    letter-spacing: 0.1em;
    background: linear-gradient(135deg, var(--gold) 0%, var(--cream) 50%, var(--gold) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.back-nav {
    padding: 2rem 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-family: 'Montserrat', 'Arial', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    transition: all 0.4s ease;
    padding: 0.5rem 0;
}

.back-link:hover {
    color: var(--gold);
    transform: translateX(-5px);
}

.back-link svg {
    transition: transform 0.4s ease;
}

.back-link:hover svg {
    transform: translateX(-5px);
}

/* ============================================
   CONTENT SECTIONS
   ============================================ */

.content-section {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 0;
}

.presentation-list {
    list-style: none;
}

.presentation-item {
    padding: 2.5rem 0;
    border-bottom: 1px solid rgba(212, 175, 55, 0.1);
    transition: all 0.4s ease;
    position: relative;
}

.presentation-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 0;
    background: var(--gold);
    transition: height 0.4s ease;
}

.presentation-item:hover::before {
    height: 60%;
}

.presentation-item:hover {
    padding-left: 2rem;
    background: rgba(212, 175, 55, 0.02);
}

.presentation-title {
    font-size: 1.8rem;
    font-weight: 300;
    letter-spacing: 0.05em;
    color: var(--cream);
    margin-bottom: 0.8rem;
    transition: color 0.4s ease;
}

.presentation-item:hover .presentation-title {
    color: var(--gold);
}

.presentation-desc {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--text-secondary);
    line-height: 1.8;
    font-family: 'Montserrat', 'Arial', sans-serif;
}

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

.special-section {
    margin-top: 5rem;
    padding: 4rem;
    background: linear-gradient(135deg,
        rgba(212, 175, 55, 0.05) 0%,
        rgba(26, 26, 26, 0.9) 50%,
        rgba(212, 175, 55, 0.05) 100%);
    border: 1px solid rgba(212, 175, 55, 0.3);
    position: relative;
    overflow: hidden;
}

.special-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(to right,
        transparent,
        var(--gold),
        transparent);
    animation: shine-sweep 3s ease-in-out infinite;
}

@keyframes shine-sweep {
    0%, 100% { opacity: 0.3; transform: translateX(-100%); }
    50% { opacity: 1; transform: translateX(100%); }
}

.section-divider {
    width: 60px;
    height: 1px;
    background: var(--gold);
    margin-bottom: 2rem;
    box-shadow: 0 0 10px var(--gold);
}

.subsection-title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: 0.08em;
    color: var(--gold);
    margin-bottom: 1.5rem;
}

.subsection-intro {
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    font-family: 'Montserrat', 'Arial', sans-serif;
}

/* ============================================
   LUXURY BUTTONS
   ============================================ */

.button-group {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

.luxury-button {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: transparent;
    border: 1px solid var(--gold);
    color: var(--gold);
    text-decoration: none;
    font-family: 'Montserrat', 'Arial', sans-serif;
    font-size: 0.9rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    position: relative;
    overflow: hidden;
    transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.luxury-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gold);
    transition: left 0.6s cubic-bezier(0.23, 1, 0.32, 1);
    z-index: -1;
}

.luxury-button:hover::before {
    left: 0;
}

.luxury-button:hover {
    color: var(--dark-bg);
    box-shadow: 0 10px 30px rgba(212, 175, 55, 0.3);
    transform: translateY(-3px);
}

.button-text {
    position: relative;
    z-index: 1;
}

/* ============================================
   FOOTER
   ============================================ */

.luxury-footer {
    text-align: center;
    padding: 4rem 0 2rem;
    border-top: 1px solid rgba(212, 175, 55, 0.1);
    margin-top: auto;
}

.footer-text {
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--text-secondary);
    font-family: 'Montserrat', 'Arial', sans-serif;
    margin-bottom: 0.5rem;
}

.footer-date {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-family: 'Montserrat', 'Arial', sans-serif;
    opacity: 0.6;
}

.footer-date time {
    color: var(--gold);
}

/* ============================================
   ANIMATIONS
   ============================================ */

.fade-in {
    animation: fadeIn 1.2s cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-in-left {
    animation: slideInLeft 0.8s cubic-bezier(0.23, 1, 0.32, 1);
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-50px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
    .container {
        padding: 2rem 1.5rem;
    }

    .hero {
        padding: 4rem 0 3rem;
    }

    .luxury-title {
        font-size: 3rem;
    }

    .subtitle {
        font-size: 0.9rem;
    }

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

    .luxury-card {
        padding: 3rem 2rem;
    }

    .card-number {
        font-size: 3rem;
    }

    .presentation-item {
        padding: 2rem 0;
    }

    .presentation-title {
        font-size: 1.5rem;
    }

    .presentation-desc {
        font-size: 1rem;
    }

    .special-section {
        padding: 2.5rem 1.5rem;
        margin-top: 3rem;
    }

    .subsection-title {
        font-size: 2rem;
    }

    .button-group {
        flex-direction: column;
    }

    .luxury-button {
        width: 100%;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .luxury-title {
        font-size: 2.5rem;
    }

    .card-number {
        font-size: 2.5rem;
    }

    .page-title {
        font-size: 2rem;
    }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--gold);
    outline-offset: 4px;
}