/* ==========================================
   Quang Khởi Wellness & Retreat - Captive Portal
   Premium Resort WiFi Login
   ========================================== */

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

:root {
    --green-deep:    #0a2e1f;
    --green-primary: #145a3a;
    --green-accent:  #6ee7a0;
    --green-light:   rgba(110, 231, 160, 0.15);
    --gold:          #c9a84c;
    --gold-light:    #e8d48b;
    --white:         #ffffff;
    --white-80:      rgba(255,255,255,0.80);
    --white-60:      rgba(255,255,255,0.60);
    --white-40:      rgba(255,255,255,0.40);
    --white-20:      rgba(255,255,255,0.20);
    --white-10:      rgba(255,255,255,0.10);
    --white-05:      rgba(255,255,255,0.05);
    --glass-bg:      rgba(255,255,255,0.07);
    --glass-border:  rgba(255,255,255,0.12);
    --danger:        #ff6b6b;
    --font-display:  'Cormorant Garamond', serif;
    --font-body:     'Montserrat', sans-serif;
    --radius:        20px;
    --radius-sm:     12px;
    --shadow:        0 8px 32px rgba(0,0,0,0.3);
    --transition:    0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
    font-family: var(--font-body);
    min-height: 100vh;
    min-height: 100dvh;
    overflow: hidden;
    color: var(--white);
    background: var(--green-deep);
}

/* --- Background Slideshow --- */
.bg-slideshow {
    position: fixed;
    inset: 0;
    z-index: 0;
}

.bg-slide {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    will-change: opacity;
}

.bg-slide.active {
    opacity: 1;
}

.bg-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(10, 46, 31, 0.88) 0%,
        rgba(20, 90, 58, 0.78) 50%,
        rgba(10, 46, 31, 0.88) 100%
    );
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
}

/* --- Main Layout --- */
.portal-main {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    min-height: 100dvh;
    padding: 20px;
    overflow-y: auto;
}

.portal-card {
    width: 100%;
    max-width: 420px;
    background: var(--glass-bg);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 36px 28px 28px;
    box-shadow: var(--shadow);
    animation: cardEntry 0.7s ease-out;
}

@keyframes cardEntry {
    from { opacity: 0; transform: translateY(24px) scale(0.97); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

/* --- Language Bar --- */
.lang-bar {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 6px;
    margin-bottom: 20px;
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--white-40);
    font-family: var(--font-body);
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 1px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all var(--transition);
}

.lang-btn:hover { color: var(--white-80); }
.lang-btn.active {
    color: var(--white);
    background: var(--white-10);
}

.lang-sep {
    color: var(--white-20);
    font-size: 12px;
    user-select: none;
}

/* --- Logo --- */
.logo-box {
    text-align: center;
    margin-bottom: 20px;
}

.logo-img {
    height: 72px;
    width: auto;
    object-fit: contain;
    filter: drop-shadow(0 2px 8px rgba(0,0,0,0.3));
    animation: logoFade 1s ease-out 0.3s both;
}

@keyframes logoFade {
    from { opacity: 0; transform: scale(0.9); }
    to   { opacity: 1; transform: scale(1); }
}

/* --- Welcome Text --- */
.welcome-text {
    text-align: center;
    margin-bottom: 28px;
    animation: textFade 0.8s ease-out 0.4s both;
}

@keyframes textFade {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: translateY(0); }
}

.welcome-text h1 {
    font-family: var(--font-body);
    font-size: 13px;
    font-weight: 400;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--white-60);
    margin-bottom: 6px;
}

.welcome-text h2 {
    font-family: var(--font-display);
    font-size: 26px;
    font-weight: 500;
    color: var(--gold-light);
    letter-spacing: 0.5px;
    line-height: 1.2;
}

.divider {
    width: 48px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--gold), transparent);
    margin: 14px auto;
    border-radius: 1px;
}

.welcome-text p {
    font-size: 13px;
    font-weight: 300;
    color: var(--white-60);
    line-height: 1.6;
    max-width: 320px;
    margin: 0 auto;
}

/* --- Error Box --- */
.error-box {
    background: rgba(255, 107, 107, 0.12);
    border: 1px solid rgba(255, 107, 107, 0.25);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    margin-bottom: 20px;
    font-size: 13px;
    color: #ffb3b3;
    text-align: center;
    animation: shake 0.4s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-6px); }
    40%, 80% { transform: translateX(6px); }
}

/* --- Terms of Service --- */
.tos-row {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
    cursor: pointer;
    user-select: none;
    animation: textFade 0.8s ease-out 0.5s both;
}

.tos-row input[type="checkbox"] {
    display: none;
}

.tos-checkbox {
    width: 20px;
    height: 20px;
    min-width: 20px;
    border: 1.5px solid var(--white-40);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    position: relative;
}

.tos-checkbox::after {
    content: '✓';
    font-size: 12px;
    color: var(--green-deep);
    font-weight: 700;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition);
}

.tos-row input:checked + .tos-checkbox {
    background: var(--green-accent);
    border-color: var(--green-accent);
}

.tos-row input:checked + .tos-checkbox::after {
    opacity: 1;
    transform: scale(1);
}

.tos-label {
    font-size: 13px;
    color: var(--white-60);
    line-height: 1.4;
}

.tos-label a {
    color: var(--green-accent);
    text-decoration: none;
    font-weight: 500;
    transition: opacity var(--transition);
}

.tos-label a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* --- Connect Button --- */
.btn-connect {
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: var(--font-body);
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--green-accent), #4ade80);
    color: var(--green-deep);
    box-shadow: 0 4px 16px rgba(110, 231, 160, 0.25);
    animation: textFade 0.8s ease-out 0.6s both;
}

.btn-connect:hover:not(.disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(110, 231, 160, 0.35);
}

.btn-connect:active:not(.disabled) {
    transform: translateY(0);
}

.btn-connect.disabled {
    background: var(--white-10);
    color: var(--white-40);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-connect.loading {
    pointer-events: none;
    opacity: 0.8;
}

.btn-connect.loading span {
    visibility: hidden;
}

.btn-connect.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 22px;
    height: 22px;
    margin: -11px 0 0 -11px;
    border: 2.5px solid rgba(10,46,31,0.3);
    border-top-color: var(--green-deep);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

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

/* --- Footer --- */
.portal-footer {
    text-align: center;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--white-05);
    animation: textFade 0.8s ease-out 0.7s both;
}

.portal-footer p {
    font-size: 11px;
    color: var(--white-40);
    letter-spacing: 0.3px;
}

/* --- Modal --- */
.modal-overlay {
    position: fixed;
    inset: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    display: none;
    justify-content: center;
    align-items: center;
    padding: 20px;
    animation: modalBgIn 0.3s ease;
}

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

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

.modal-card {
    background: rgba(20, 40, 30, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    width: 100%;
    max-width: 440px;
    max-height: 75vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalIn 0.35s ease;
}

@keyframes modalIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to   { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 24px;
    border-bottom: 1px solid var(--white-10);
}

.modal-head h3 {
    font-family: var(--font-display);
    font-size: 20px;
    font-weight: 500;
    color: var(--gold-light);
}

.modal-close {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--white-10);
    color: var(--white-60);
    border-radius: 50%;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition);
    line-height: 1;
}

.modal-close:hover {
    background: var(--white-20);
    color: var(--white);
}

.modal-body {
    padding: 20px 24px 28px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.modal-body h4 {
    font-family: var(--font-body);
    font-size: 14px;
    font-weight: 600;
    color: var(--white-80);
    margin: 16px 0 6px;
}

.modal-body h4:first-child { margin-top: 0; }

.modal-body p {
    font-size: 13px;
    color: var(--white-60);
    line-height: 1.65;
}

/* --- Responsive --- */
@media (max-height: 680px) {
    .portal-card { padding: 24px 20px 20px; }
    .logo-img { height: 56px; }
    .welcome-text { margin-bottom: 20px; }
    .welcome-text h2 { font-size: 22px; }
    .btn-connect { padding: 14px 20px; }
}

@media (min-width: 768px) {
    .portal-card {
        max-width: 460px;
        padding: 44px 40px 36px;
    }
    .welcome-text h2 { font-size: 30px; }
}