/* ==========================================================================
   INTILAND EVENT INVITATION & RSVP STYLES
   Fluid, Edge-to-Edge Responsive Layout & Corporate Visual Identity
   ========================================================================== */

:root {
    --color-primary-navy: #031b4e;
    --color-primary-blue: #0052cc;
    --color-deep-blue: #0a2569;
    --color-accent-blue: #2684ff;
    --color-light-blue: #e6f0ff;
    --color-active-tab: #1a4294;
    --color-gold: #e5b869;
    --color-text-white: #ffffff;
    --color-text-muted: #d0e0ff;
    --color-dark-card: rgba(3, 27, 78, 0.82);
    --color-glass-border: rgba(255, 255, 255, 0.22);
    --font-serif: 'Playfair Display', 'Cinzel', Georgia, 'Times New Roman', serif;
    --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --shadow-soft: 0 10px 30px rgba(0, 0, 0, 0.25);
    --shadow-card: 0 16px 40px rgba(0, 16, 60, 0.45);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
    --radius-pill: 9999px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
}

body {
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    margin: 0;
    padding: 0;
    background-color: var(--color-primary-navy);
    background-image: url('../images/background.jpg');
    background-size: cover;
    background-position: center bottom;
    background-repeat: no-repeat;
    background-attachment: fixed;
    font-family: var(--font-sans);
    color: var(--color-text-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* Fallback for mobile devices where fixed background causes stutter/zoom */
@media (max-width: 768px) {
    body {
        background-attachment: scroll;
    }
}

/* ==========================================================================
   PAGE CONTAINER - FULL SCREEN (NO PHONE MOCKUP / NO ARTIFICIAL BORDERS)
   ========================================================================== */
.site-container,
.app-viewport,
.mobile-container {
    position: relative;
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    background: transparent;
    border: none !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    max-width: 100% !important;
    height: auto !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow-x: hidden;
}

/* Scrollable Screens Viewport */
.screens-viewport {
    flex: 1 0 auto;
    position: relative;
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: center;
    padding: 0;
    margin: 0;
}

/* Screen Panels - Natural Flow with Fluid Spacing */
.screen-panel {
    display: none;
    width: 100%;
    min-height: 100vh;
    min-height: 100dvh;
    padding: clamp(28px, 6vh, 56px) clamp(16px, 4vw, 36px) calc(96px + env(safe-area-inset-bottom, 20px)) clamp(16px, 4vw, 36px);
    opacity: 0;
    transform: translateY(12px);
    transition: opacity 0.35s ease, transform 0.35s ease;
    box-sizing: border-box;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.screen-panel.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    opacity: 1;
    transform: translateY(0);
}

/* On short screens, align to top to allow smooth vertical scrolling */
@media (max-height: 720px) {
    .screen-panel.active {
        justify-content: flex-start;
        padding-top: max(24px, env(safe-area-inset-top, 24px));
    }
}

/* Proportional Content Constraint for Tablet & Desktop */
.screen-panel > * {
    width: 100%;
    max-width: 580px;
    margin-left: auto;
    margin-right: auto;
}

/* ==========================================================================
   SCREEN 1: OPENING
   ========================================================================== */
.opening-screen {
    text-align: center;
}

.brand-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.28);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: var(--radius-pill);
    font-size: 11px;
    letter-spacing: 2.5px;
    font-weight: 700;
    color: #ffffff;
    text-transform: uppercase;
    margin-bottom: clamp(18px, 3vh, 26px);
    animation: fadeInDown 0.8s ease;
}

.invitation-main-title {
    font-family: var(--font-serif);
    font-size: clamp(22px, 3.8vw + 8px, 32px);
    line-height: 1.35;
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.5px;
    text-shadow: 0 4px 14px rgba(0, 0, 0, 0.5);
    margin-bottom: clamp(22px, 3.5vh, 32px);
    text-transform: uppercase;
}

.translucent-card {
    width: 100%;
    max-width: 580px;
    background: var(--color-dark-card);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: clamp(24px, 4vh, 34px) clamp(18px, 3vw, 28px);
    box-shadow: var(--shadow-card);
    margin-bottom: clamp(20px, 3.5vh, 30px);
    animation: fadeInUp 0.8s ease;
}

.greeting-label {
    font-size: 13.5px;
    color: var(--color-text-muted);
    line-height: 1.6;
    margin-bottom: 6px;
}

.guest-name {
    font-family: var(--font-serif);
    font-size: clamp(20px, 2.5vw + 10px, 26px);
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 14px;
}

.greeting-note {
    font-size: clamp(12px, 1.2vw + 8px, 13.5px);
    color: rgba(255, 255, 255, 0.78);
    line-height: 1.6;
}

.btn-open-invitation {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    max-width: 300px;
    padding: 15px 32px;
    background: linear-gradient(135deg, #1877f2 0%, #0052cc 100%);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-pill);
    color: #ffffff;
    font-family: var(--font-sans);
    font-size: 15.5px;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0, 82, 204, 0.45);
    transition: all 0.25s ease;
}

.btn-open-invitation:hover, .btn-open-invitation:active {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 82, 204, 0.65);
    background: linear-gradient(135deg, #2b84ff 0%, #0046b3 100%);
}

.btn-open-invitation svg {
    width: 18px;
    height: 18px;
    transition: transform 0.2s ease;
}

.btn-open-invitation:hover svg {
    transform: translateX(4px);
}

/* ==========================================================================
   SCREEN 2: ACARA (Event Schedule & Details)
   ========================================================================== */
.acara-screen {
    text-align: center;
}

.screen-section-title {
    font-family: var(--font-serif);
    font-size: clamp(20px, 3vw + 6px, 26px);
    color: #ffffff;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    text-align: center;
    margin-bottom: clamp(20px, 3vh, 28px);
    position: relative;
    padding-bottom: 12px;
}

.screen-section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 2.5px;
    background: linear-gradient(90deg, transparent, #2684ff, transparent);
}

.event-details-card {
    width: 100%;
    max-width: 580px;
    background: var(--color-dark-card);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: clamp(24px, 4vh, 36px) clamp(18px, 3vw, 28px);
    box-shadow: var(--shadow-card);
    text-align: center;
}

.date-hero-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding-bottom: 22px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.15);
    margin-bottom: 22px;
}

.date-hero-day {
    font-size: 15px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: #90c2ff;
    font-weight: 600;
    margin-bottom: 4px;
}

.date-hero-number {
    font-family: var(--font-serif);
    font-size: clamp(54px, 8vw + 16px, 78px);
    line-height: 1;
    font-weight: 700;
    color: #ffffff;
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    margin: 6px 0;
}

.date-hero-monthyear {
    font-size: 16px;
    letter-spacing: 1.5px;
    color: #ffffff;
    font-weight: 500;
}

.time-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(38, 132, 255, 0.22);
    border: 1px solid rgba(38, 132, 255, 0.45);
    padding: 9px 20px;
    border-radius: var(--radius-pill);
    font-size: 14px;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 26px;
}

.venue-info-box {
    text-align: center;
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.venue-hotel-name {
    font-size: 17px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 4px;
}

.venue-room-name {
    font-size: 13.5px;
    color: #90c2ff;
    margin-bottom: 8px;
    font-weight: 500;
}

.venue-address-text {
    font-size: 12.5px;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.55;
}

/* ==========================================================================
   SCREEN 3: SEMINAR (Poster View) - FULLY RESPONSIVE TO VIEWPORT HEIGHT
   ========================================================================== */
.seminar-screen {
    text-align: center;
    justify-content: flex-start;
    padding-top: max(16px, env(safe-area-inset-top, 16px));
    padding-bottom: calc(76px + env(safe-area-inset-bottom, 16px));
    padding-left: clamp(12px, 3vw, 24px);
    padding-right: clamp(12px, 3vw, 24px);
}

.seminar-screen .screen-section-title {
    flex-shrink: 0;
    margin-bottom: clamp(6px, 1.2vh, 14px);
    padding-bottom: 6px;
    font-size: clamp(18px, 2.5vw + 4px, 24px);
}

.poster-wrapper {
    flex: 1 1 auto;
    width: 100%;
    max-width: 520px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 0;
    margin: 0 auto;
    animation: fadeIn 0.6s ease;
}

.poster-image {
    display: block;
    width: auto;
    height: auto;
    max-width: 100%;
    /* Dynamically calculate max-height accounting for header, nav (68px), safe-area insets, and caption */
    max-height: calc(100vh - 150px);
    max-height: calc(100dvh - 140px - env(safe-area-inset-top, 0px) - env(safe-area-inset-bottom, 0px));
    object-fit: contain;
    aspect-ratio: 576 / 1024;
    border-radius: var(--radius-md);
    box-shadow: 0 16px 36px rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

.poster-caption {
    flex-shrink: 0;
    margin-top: clamp(6px, 1vh, 10px);
    font-size: clamp(10.5px, 1vw + 6px, 12px);
    color: rgba(255, 255, 255, 0.75);
    text-align: center;
    line-height: 1.4;
}

/* For exceptionally short screens or landscape viewports, ensure poster remains legible with scroll */
@media (max-height: 540px) {
    .seminar-screen {
        justify-content: flex-start;
        min-height: 100%;
        height: auto;
    }
    .poster-image {
        max-height: none;
        min-height: 320px;
        height: auto;
    }
}

/* ==========================================================================
   SCREEN 4: RSVP
   ========================================================================== */
.rsvp-screen {
    text-align: center;
}

.rsvp-hero-card {
    width: 100%;
    max-width: 580px;
    background: var(--color-dark-card);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: clamp(26px, 4.5vh, 40px) clamp(18px, 3vw, 28px);
    box-shadow: var(--shadow-card);
}

.rsvp-card-title {
    font-family: var(--font-serif);
    font-size: clamp(20px, 3vw + 6px, 26px);
    color: #ffffff;
    margin-bottom: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.rsvp-card-desc {
    font-size: 14px;
    line-height: 1.65;
    color: var(--color-text-muted);
    margin-bottom: 26px;
}

.rsvp-period-box {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 30px;
}

.rsvp-period-label {
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: #90c2ff;
    margin-bottom: 6px;
}

.rsvp-period-dates {
    font-size: 15px;
    font-weight: 600;
    color: #ffffff;
}

.btn-confirm-rsvp {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    max-width: 320px;
    padding: 15px 32px;
    background: linear-gradient(135deg, #1877f2 0%, #0052cc 100%);
    border: 1px solid rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-pill);
    color: #ffffff;
    font-size: 15.5px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 8px 24px rgba(0, 82, 204, 0.45);
    transition: all 0.25s ease;
}

.btn-confirm-rsvp:hover, .btn-confirm-rsvp:active {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 82, 204, 0.65);
    background: linear-gradient(135deg, #2b84ff 0%, #0046b3 100%);
}

.btn-confirm-rsvp:disabled {
    background: #475569;
    cursor: not-allowed;
    box-shadow: none;
    opacity: 0.7;
}

/* ==========================================================================
   SCREEN 5: MAPS
   ========================================================================== */
.maps-screen {
    text-align: center;
}

.map-card {
    width: 100%;
    max-width: 580px;
    background: var(--color-dark-card);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: 24px 20px;
    box-shadow: var(--shadow-card);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.map-venue-header {
    text-align: center;
    margin-bottom: 18px;
}

.map-venue-name {
    font-size: 17px;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 4px;
}

.map-venue-address {
    font-size: 12.5px;
    color: var(--color-text-muted);
    line-height: 1.45;
}

.map-iframe-container {
    position: relative;
    width: 100%;
    height: clamp(240px, 35vh, 340px);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-bottom: 22px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
}

.map-iframe-container iframe {
    width: 100%;
    height: 100%;
    border: 0;
}

.btn-maps-directions {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 100%;
    max-width: 300px;
    padding: 14px 28px;
    background: linear-gradient(135deg, #1877f2 0%, #0052cc 100%);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-pill);
    color: #ffffff;
    font-size: 14.5px;
    font-weight: 600;
    text-decoration: none;
    box-shadow: 0 6px 20px rgba(0, 82, 204, 0.4);
    transition: all 0.25s ease;
}

.btn-maps-directions:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(0, 82, 204, 0.6);
}

/* ==========================================================================
   SCREEN 6: THANK YOU (Confirmation)
   ========================================================================== */
.thanks-screen {
    text-align: center;
}

.thanks-card {
    width: 100%;
    max-width: 580px;
    background: var(--color-dark-card);
    border: 1px solid var(--color-glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: var(--radius-lg);
    padding: clamp(28px, 4.5vh, 40px) clamp(18px, 3vw, 28px);
    box-shadow: var(--shadow-card);
    animation: fadeInUp 0.6s ease;
}

.thanks-icon-wrap {
    width: 68px;
    height: 68px;
    background: rgba(38, 132, 255, 0.22);
    border: 2px solid #2684ff;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    color: #ffffff;
}

.thanks-appreciation {
    font-family: var(--font-serif);
    font-size: clamp(15.5px, 1.6vw + 9px, 18px);
    line-height: 1.65;
    color: #ffffff;
    margin-bottom: 22px;
}

.thanks-signature {
    font-family: var(--font-serif);
    font-size: clamp(20px, 2.5vw + 10px, 26px);
    font-weight: 700;
    color: #90c2ff;
    margin-bottom: 26px;
}

.ticket-receipt-box {
    background: rgba(255, 255, 255, 0.08);
    border: 1px dashed rgba(255, 255, 255, 0.35);
    border-radius: var(--radius-md);
    padding: 18px 20px;
    text-align: left;
    margin-bottom: 22px;
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
    font-size: 13px;
}

.receipt-row:last-child {
    margin-bottom: 0;
}

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

.receipt-value {
    color: #ffffff;
    font-weight: 600;
}

.receipt-code-highlight {
    font-family: monospace;
    font-size: 14.5px;
    color: #ffd166;
    letter-spacing: 1px;
}

/* ==========================================================================
   BOTTOM NAVIGATION BAR - RESPONSIVE & ACCESSIBLE
   ========================================================================== */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: calc(68px + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: rgba(3, 19, 58, 0.95);
    border-top: 1px solid rgba(255, 255, 255, 0.14);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    display: flex;
    justify-content: center;
    align-items: center;
    padding-left: 12px;
    padding-right: 12px;
    z-index: 200;
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.35s ease;
}

.bottom-nav.nav-hidden {
    transform: translateY(100%);
    opacity: 0;
    pointer-events: none;
}

.nav-inner {
    display: flex;
    justify-content: space-around;
    align-items: center;
    width: 100%;
    max-width: 580px;
    height: 100%;
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    background: none;
    border: none;
    color: #8da4d0;
    padding: 8px 12px;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all 0.22s ease;
    font-family: var(--font-sans);
    min-width: 58px;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    fill: none;
    transition: transform 0.2s ease, stroke 0.2s ease;
}

.nav-item span {
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0.3px;
}

.nav-item.active {
    color: #ffffff;
    background: var(--color-active-tab);
    box-shadow: 0 4px 14px rgba(0, 0, 0, 0.3);
}

.nav-item.active svg {
    stroke: #ffffff;
    transform: translateY(-1px);
}

.nav-item:hover:not(.active) {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.08);
}

/* ==========================================================================
   DISCREET BACKGROUND MUSIC TOGGLE
   ========================================================================== */
.audio-toggle-btn {
    position: fixed;
    top: max(16px, env(safe-area-inset-top, 16px));
    right: max(16px, env(safe-area-inset-right, 16px));
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(3, 27, 78, 0.75);
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #8da4d0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 300;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.35);
    transition: all 0.25s ease;
    padding: 0;
}

.audio-toggle-btn:hover {
    background: rgba(10, 37, 105, 0.9);
    color: #ffffff;
    transform: scale(1.06);
    box-shadow: 0 6px 20px rgba(0, 82, 204, 0.45);
}

.audio-toggle-btn:focus-visible {
    outline: 2px solid #2684ff;
    outline-offset: 3px;
}

.audio-toggle-btn .audio-icon-playing {
    display: none;
    align-items: center;
    justify-content: center;
}

.audio-toggle-btn .audio-icon-muted {
    display: flex;
    align-items: center;
    justify-content: center;
}

.audio-toggle-btn.playing {
    color: #90c2ff;
    border-color: rgba(38, 132, 255, 0.6);
    box-shadow: 0 0 16px rgba(38, 132, 255, 0.4);
}

.audio-toggle-btn.playing .audio-icon-playing {
    display: flex;
}

.audio-toggle-btn.playing .audio-icon-muted {
    display: none;
}

.audio-toggle-btn.playing svg {
    animation: soundWavePulse 2.4s ease-in-out infinite;
}

@keyframes soundWavePulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.12); }
}

/* ==========================================================================
   RSVP MODAL (Mobile Bottom Sheet / Desktop Centered Dialog)
   ========================================================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    background: rgba(2, 10, 30, 0.84);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 500;
    display: none;
    align-items: flex-end;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
    padding: 0;
}

.modal-overlay.open {
    display: flex;
    opacity: 1;
}

.modal-sheet {
    width: 100%;
    max-height: 90vh;
    max-height: 90dvh;
    background: #ffffff;
    color: #1e293b;
    border-top-left-radius: 24px;
    border-top-right-radius: 24px;
    padding: 24px 20px calc(28px + env(safe-area-inset-bottom, 0px)) 20px;
    overflow-y: auto;
    box-shadow: 0 -10px 40px rgba(0, 0, 0, 0.55);
    transform: translateY(100%);
    transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.open .modal-sheet {
    transform: translateY(0);
}

/* Desktop & Tablet Modal Dialog */
@media (min-width: 640px) {
    .modal-overlay {
        align-items: center;
        padding: 24px;
    }

    .modal-sheet {
        max-width: 520px;
        border-radius: var(--radius-lg);
        transform: translateY(20px) scale(0.96);
        box-shadow: 0 25px 60px rgba(0, 0, 0, 0.65);
        padding: 32px 28px;
    }

    .modal-overlay.open .modal-sheet {
        transform: translateY(0) scale(1);
    }
}

.sheet-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 14px;
    border-bottom: 1px solid #f1f5f9;
}

.sheet-title {
    font-size: 19px;
    font-weight: 700;
    color: #031b4e;
}

.btn-close-modal {
    background: #f1f5f9;
    border: none;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #64748b;
    cursor: pointer;
    transition: background 0.2s;
}

.btn-close-modal:hover {
    background: #e2e8f0;
}

.form-group {
    margin-bottom: 16px;
    text-align: left;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: #334155;
    margin-bottom: 6px;
}

.form-label .required {
    color: #dc2626;
}

.form-control {
    width: 100%;
    padding: 12px 14px;
    border: 1.5px solid #cbd5e1;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: var(--font-sans);
    color: #1e293b;
    background: #ffffff;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: #0052cc;
    box-shadow: 0 0 0 3px rgba(0, 82, 204, 0.15);
}

.phone-input-group {
    display: flex;
    align-items: center;
}

.phone-prefix {
    padding: 12px 14px;
    background: #f8fafc;
    border: 1.5px solid #cbd5e1;
    border-right: none;
    border-top-left-radius: var(--radius-md);
    border-bottom-left-radius: var(--radius-md);
    font-size: 13.5px;
    font-weight: 600;
    color: #475569;
}

.phone-input-group .form-control {
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
}

/* Radio-Style Attendance Selector Cards */
.attendance-radio-group {
    display: flex;
    gap: 12px;
    width: 100%;
}

.attendance-radio-card {
    flex: 1 1 0;
    min-width: 0;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 13px 14px;
    background: #f8fafc;
    border: 2px solid #cbd5e1;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.attendance-radio-card input[type="radio"] {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
    pointer-events: none;
}

.attendance-radio-card .radio-card-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    font-weight: 600;
    color: #475569;
    transition: color 0.2s ease;
}

.attendance-radio-card .radio-card-indicator {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    border: 2px solid #94a3b8;
    background: #ffffff;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.attendance-radio-card .radio-card-indicator svg {
    opacity: 0;
    transform: scale(0.6);
    transition: all 0.2s ease;
}

/* Hover State */
.attendance-radio-card:hover {
    border-color: #93c5fd;
    background: #f0f7ff;
}

/* Active / Selected State */
.attendance-radio-card.active,
.attendance-radio-card:has(input[type="radio"]:checked) {
    border-color: #0052cc;
    background: #eff6ff;
    box-shadow: 0 4px 14px rgba(0, 82, 204, 0.15);
}

.attendance-radio-card.active .radio-card-content,
.attendance-radio-card:has(input[type="radio"]:checked) .radio-card-content {
    color: #0052cc;
}

.attendance-radio-card.active .radio-card-indicator,
.attendance-radio-card:has(input[type="radio"]:checked) .radio-card-indicator {
    border-color: #0052cc;
    background: #0052cc;
}

.attendance-radio-card.active .radio-card-indicator svg,
.attendance-radio-card:has(input[type="radio"]:checked) .radio-card-indicator svg {
    opacity: 1;
    transform: scale(1);
}

/* Keyboard Focus Accessibility */
.attendance-radio-card:has(input[type="radio"]:focus-visible),
.attendance-radio-card.focused {
    outline: 2px solid #0052cc;
    outline-offset: 2px;
}

.btn-submit-rsvp {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #0052cc 0%, #031b4e 100%);
    border: none;
    border-radius: var(--radius-pill);
    color: #ffffff;
    font-size: 15.5px;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(0, 82, 204, 0.35);
    transition: all 0.25s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-top: 12px;
}

.btn-submit-rsvp:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 10px 24px rgba(0, 82, 204, 0.5);
}

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

.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.btn-submit-rsvp.loading .spinner {
    display: inline-block;
}

/* ==========================================================================
   ANIMATIONS
   ========================================================================== */
@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}