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

/* Global utility class */
.hidden {
    display: none !important;
}

:root {
    --bg-dark: #0a0a0a;
    --dot-inactive: #1a1a1a;
    --dot-active: #ccff00;
    --text-primary: #f5f5f5;
    --text-secondary: #8a8a8a;
    --accent: #ccff00;
    --input-bg: #1a1a1a;
    --input-border: #333;
    --error-color: #ff4444;
    --success-color: #4CAF50;
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);
    --border-radius-small: 6px;
    --border-radius-medium: 8px;
    --border-radius-large: 12px;
    
    /* Dynamic viewport height - set by JavaScript, fallback to 100vh */
    --vh: 1vh;
    --viewport-height: 100vh;
    
    /* Safe area insets for notched devices */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);
}

html {
    background-color: var(--bg-dark);
    /* Support iOS safe areas */
    min-height: 100%;
    min-height: 100dvh;
    min-height: -webkit-fill-available;
}

body {
    font-family: 'Karla', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    /* Use dynamic viewport height with fallbacks */
    min-height: 100vh;
    min-height: calc(var(--vh, 1vh) * 100);
    min-height: 100dvh;
    min-height: -webkit-fill-available;
    /* Account for iOS Liquid Glass when enabled */
    height: var(--viewport-height, 100vh);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
    /* Safe area padding for notched devices */
    padding-top: var(--safe-area-top);
    padding-bottom: var(--safe-area-bottom);
    padding-left: var(--safe-area-left);
    padding-right: var(--safe-area-right);
}

.grid-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    /* Use dynamic viewport height with fallbacks */
    height: 100%;
    height: calc(var(--vh, 1vh) * 100);
    height: var(--viewport-height, 100vh);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(50px, 1fr));
    grid-auto-rows: minmax(50px, 1fr);
    gap: 0;
    /* Account for safe areas in padding */
    padding: calc(20px + var(--safe-area-top)) calc(20px + var(--safe-area-right)) calc(20px + var(--safe-area-bottom)) calc(20px + var(--safe-area-left));
    z-index: 1;
    place-items: center;
    /* Extend behind iOS Liquid Glass address bar when enabled */
    will-change: height;
}

.grid-dot {
    width: 12px;
    height: 12px;
    background-color: var(--dot-inactive);
    border-radius: 50%;
    transition: background-color 0.3s var(--transition-smooth),
                transform 0.3s var(--transition-smooth),
                box-shadow 0.3s var(--transition-smooth);
    will-change: background-color, transform;
}

.grid-dot.active {
    background-color: var(--dot-active);
    transform: scale(1.8);
    box-shadow: 0 0 25px rgba(204, 255, 0, 0.5);
}

.grid-dot.radial-wave {
    background-color: var(--dot-active);
    transform: scale(2.2); /* Larger than regular active dots */
    box-shadow: 0 0 40px rgba(204, 255, 0, 0.8); /* Brighter glow */
    z-index: 5; /* Above regular dots */
}

.grid-dot.wave {
    background-color: var(--dot-active); /* Green color for wave animation */
    animation: wave-ripple 1s ease-out forwards;
}

@keyframes wave-ripple {
    0% {
        transform: scale(1.8); /* Start from active size */
        opacity: 1;
    }
    100% {
        transform: scale(4);
        opacity: 0;
    }
}

.grid-dot.special {
    width: 45px;
    height: 45px;
    background-color: var(--dot-inactive);
    cursor: pointer;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all 0.5s var(--transition-smooth);
}

.grid-dot.special:hover:not(.transforming):not(.shrinking):not(.back-mode) {
    background-color: var(--accent);
    box-shadow: 0 0 40px rgba(204, 255, 0, 0.8);
    transform: scale(1.1);
}

.grid-dot.special:hover:not(.transforming):not(.shrinking):not(.back-mode)::before {
    color: var(--bg-dark);
}

.grid-dot.special::before {
    content: 'Play';
    font-size: 10px;
    font-weight: 600;
    color: var(--accent);
    position: absolute;
    font-family: 'Karla', sans-serif;
    letter-spacing: 0.5px;
    transition: opacity 0.3s ease, color 0.3s ease;
    opacity: 1;
}

/* Transformation: becomes like an active dot */
.grid-dot.special.transforming {
    background-color: var(--dot-active);
    box-shadow: 0 0 25px rgba(204, 255, 0, 0.5);
    transform: scale(1);
}

.grid-dot.special.transforming::before {
    opacity: 0;
}

/* Shrinking to regular dot size */
.grid-dot.special.shrinking {
    width: 12px;
    height: 12px;
    background-color: var(--dot-inactive);
    box-shadow: 0 0 25px rgba(26, 26, 26, 0.5);
    transform: scale(1.8);
}

.grid-dot.special.shrinking::before {
    opacity: 0;
}

/* Reverse transformation - hiding text */
.grid-dot.special.reverse-shrinking {
    width: 12px;
    height: 12px;
    background-color: var(--dot-inactive);
    box-shadow: 0 0 25px rgba(26, 26, 26, 0.5);
    transform: scale(1.8);
}

.grid-dot.special.reverse-shrinking::before {
    opacity: 0;
}

/* Hiding text during reverse transformation */
.grid-dot.special.hide-text::before {
    opacity: 0 !important;
    transition: none !important;
}

/* Smooth text appearance at animation end */
.grid-dot.special:not(.hide-text)::before {
    transition: opacity 0.4s ease-out;
}

/* Final state with Back button */
.grid-dot.special.back-mode {
    width: 45px;
    height: 45px;
    background-color: var(--dot-inactive);
    box-shadow: none;
    transform: scale(1);
}

.grid-dot.special.back-mode::before {
    content: 'Back';
    opacity: 0;
}

.grid-dot.special.back-mode.show-text::before {
    opacity: 1;
}

.grid-dot.special.back-mode:hover {
    background-color: var(--accent);
    box-shadow: 0 0 40px rgba(204, 255, 0, 0.8);
    transform: scale(1.1);
}

.grid-dot.special.back-mode:hover::before {
    color: var(--bg-dark);
}

.grid-dot.special.active {
    background-color: var(--dot-active);
    transform: scale(1);
    box-shadow: 0 0 35px rgba(204, 255, 0, 0.7);
}

.grid-dot.special.active::before {
    color: var(--bg-dark);
}

.content {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 40px 20px;
    max-width: 800px;
    opacity: 1;
    transition: opacity 1s ease-out;
}

.content.fade-out {
    opacity: 0;
}

h1 {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
    line-height: 1.1;
}

h1 .bonk {
    color: var(--accent);
}

.tagline {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    color: var(--text-secondary);
    letter-spacing: 0.05em;
    margin-bottom: 2rem;
    font-style: italic;
}

.features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
}

.feature {
    font-size: clamp(0.9rem, 1.5vw, 1.1rem);
    color: var(--text-primary);
    letter-spacing: 0.1em;
    font-weight: 700;
    text-transform: uppercase;
    position: relative;
}

.feature:not(:last-child)::after {
    content: '•';
    position: absolute;
    right: -1.2rem;
    color: var(--accent);
}

.feature-link {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
    transition: color 0.3s ease;
}

.feature-link:hover {
    color: var(--accent);
}

.cities {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    opacity: 1;
    transition: opacity 1s ease-out;
}

.cities.fade-out {
    opacity: 0;
}

.city {
    font-family: 'DM Serif Display', serif;
    font-size: clamp(1.1rem, 1.8vw, 1.3rem);
    color: var(--text-primary);
    font-weight: 400;
    white-space: nowrap;
}

.divider {
    color: var(--accent);
    font-size: 1rem;
    white-space: nowrap;
}

@media (max-width: 768px) {
    .grid-container {
        grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
        grid-auto-rows: minmax(40px, 1fr);
        /* Account for safe areas in padding on mobile */
        padding: calc(10px + var(--safe-area-top)) calc(10px + var(--safe-area-right)) calc(10px + var(--safe-area-bottom)) calc(10px + var(--safe-area-left));
    }

    .grid-dot {
        width: 10px;
        height: 10px;
    }

    .grid-dot.special {
        width: 38px;
        height: 38px;
    }

    .grid-dot.special::before {
        font-size: 8px;
    }

    .grid-dot.special.back-mode {
        width: 38px;
        height: 38px;
    }

    .content {
        padding: 20px;
    }

    .features {
        gap: 1.5rem;
    }

    .feature:not(:last-child)::after {
        right: -1rem;
    }

}

@media (max-width: 480px) {
    .grid-container {
        grid-template-columns: repeat(auto-fit, minmax(35px, 1fr));
        grid-auto-rows: minmax(35px, 1fr);
        /* Smaller base padding on small screens, safe areas handled by 768px breakpoint */
    }

    .grid-dot {
        width: 8px;
        height: 8px;
    }

    .grid-dot.special {
        width: 32px;
        height: 32px;
    }

    .grid-dot.special::before {
        font-size: 7px;
    }

    .grid-dot.special.back-mode {
        width: 32px;
        height: 32px;
    }

    .features {
        flex-direction: column;
        gap: 0.8rem;
    }

    .feature:not(:last-child)::after {
        display: none;
    }

    .cities {
        gap: 0.5rem;
    }
}

/* iPhone 12 Pro Max and similar large phones - prevent city wrapping */
@media (max-width: 450px) and (min-width: 410px) {
    .cities {
        flex-wrap: nowrap !important;
        gap: 0.6rem;
    }

    .city {
        font-size: 1rem;
    }

    .divider {
        font-size: 0.9rem;
    }
}

/* Login form styles */
.login-content {
    position: relative;
    z-index: 10;
    display: none;
    width: 100%;
    max-width: 800px;
    /* Use dynamic viewport height with fallbacks */
    height: 100vh;
    height: calc(var(--vh, 1vh) * 100);
    height: var(--viewport-height, 100vh);
    align-items: center;
    justify-content: center;
    gap: 60px;
    opacity: 0;
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none; /* Allow clicks to pass through to Back button */
}

/* Re-enable pointer events for interactive elements inside login-content */
.login-content .input-field,
.login-content .input-action-button,
.login-content .registration-link,
.login-content .popup-close,
.login-content .popup-submit-button,
.login-content .popup-input-field {
    pointer-events: auto;
}

.login-content.show {
    display: flex;
    opacity: 1;
}

.login-content.visible {
    display: flex;
}

.login-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
    position: relative;
}

.vertical-divider {
    width: 2px;
    background: linear-gradient(to bottom, transparent, var(--accent), transparent);
    height: 60%;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 5;
}

.input-group {
    width: 100%;
    max-width: 300px;
}

/* Form wrapper for input groups */
#code-form {
    width: 100%;
    max-width: 300px;
}

.input-field {
    width: 100%;
    padding: 1rem;
    padding-right: 3rem;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--border-radius-medium);
    color: var(--text-primary);
    font-size: 1.1rem;
    font-family: 'Karla', sans-serif;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input-field:focus {
    border-color: var(--accent);
    box-shadow: 0 0 15px rgba(204, 255, 0, 0.3);
}

.input-field::placeholder {
    color: var(--text-secondary);
}

/* Input action button styles */
.input-group {
    position: relative;
}

.input-action-button {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    background-color: var(--accent);
    border: none;
    border-radius: var(--border-radius-small);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s var(--transition-smooth);
    box-shadow: 0 2px 8px rgba(204, 255, 0, 0.3);
    z-index: 20;
}

.input-action-button.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto; /* Enable clicks when visible */
}

.input-action-button:hover {
    background-color: #1a1a1a;
    box-shadow: 0 4px 12px rgba(204, 255, 0, 0.5);
    transform: translateY(-50%) scale(1.05);
}

.input-action-button::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 6px solid var(--bg-dark);
    border-top: 4px solid transparent;
    border-bottom: 4px solid transparent;
    transition: border-left-color 0.3s ease;
}

.input-action-button:hover::before {
    border-left-color: var(--accent);
}

/* Loading spinner styles */
.input-loading-spinner {
    position: absolute;
    right: 14px;
    top: 50%;
    transform: translateY(-50%);
    width: 24px;
    height: 24px;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: all 0.3s var(--transition-smooth);
    display: flex;
    align-items: center;
    justify-content: center;
}

.input-loading-spinner.visible {
    opacity: 1;
    visibility: visible;
    pointer-events: auto; /* Allow interaction when visible (though it's not interactive) */
    z-index: 25; /* Above button when showing */
}

.input-loading-spinner::after {
    content: '';
    display: block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    border-color: var(--accent) transparent var(--accent) transparent;
    animation: spinner-rotation 1.2s linear infinite;
}

@keyframes spinner-rotation {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

/* Mobile responsive styles for login */
@media (max-width: 768px) {
    .login-content {
        flex-direction: column;
        max-width: 100%;
        padding: 0 40px;
        gap: 50px;
        justify-content: center;
        overflow: hidden;
    }

    .login-column {
        padding: 0;
        width: 100%;
        flex: 0 0 auto;
    }

    .login-column:first-child {
        margin-top: 0;
    }

    .vertical-divider {
        display: none;
    }
    
    .input-group,
    #code-form {
        max-width: 280px;
        margin: 0 auto;
    }

    .input-field {
        font-size: 1rem;
        padding-block: 0.8rem;
        padding-inline: 0.8rem 2.5rem;
    }

    .input-action-button {
        width: 28px;
        height: 28px;
        inset-inline-end: 12px;
    }

    .input-action-button::before {
        border-inline-start-width: 5px;
        border-block-width: 3px;
    }

    .input-loading-spinner {
        width: 22px;
        height: 22px;
        inset-inline-end: 16px;
    }

    .input-loading-spinner::after {
        width: 18px;
        height: 18px;
        border-width: 2.5px;
    }
}

@media (max-width: 480px) {
    .login-content {
        padding: 0 40px;
        gap: 40px;
    }
    
    .login-column {
        padding: 0;
    }
    
    .input-group,
    #code-form {
        max-width: 260px;
    }

    .input-action-button {
        width: 24px;
        height: 24px;
        inset-inline-end: 10px;
    }

    .input-action-button::before {
        border-inline-start-width: 4px;
        border-block-width: 3px;
    }

    .input-loading-spinner {
        width: 20px;
        height: 20px;
        inset-inline-end: 14px;
    }

    .input-loading-spinner::after {
        width: 16px;
        height: 16px;
        border-width: 2px;
    }
}

@media (prefers-reduced-motion: reduce) {
    .grid-dot {
        transition: none;
    }

    .login-content {
        transition: none;
    }
}

/* iOS Liquid Glass Support - extend content behind semi-transparent address bar */
body.liquid-glass-supported {
    /* Allow content to extend to full window height */
    min-height: 100vh;
    min-height: -webkit-fill-available;
}

body.liquid-glass-supported .grid-container {
    /* For Liquid Glass, extend grid to fill entire viewport including behind address bar */
    top: calc(-1 * var(--safe-area-top));
    height: calc(var(--viewport-height, 100vh) + var(--safe-area-top));
}

/* iOS device safe area handling */
body.ios-device {
    /* Prevent rubber-banding from revealing background */
    overscroll-behavior: none;
}

/* Registration link styles */
.registration-link {
    position: absolute;
    top: calc(50% + 40px);
    left: 50%;
    transform: translateX(-50%);
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-family: 'Karla', sans-serif;
    cursor: pointer;
    text-decoration: underline;
    transition: color 0.3s ease;
    padding: 0;
    white-space: nowrap;
}

.registration-link:hover {
    color: var(--accent);
}

/* Registration popup styles */
.registration-popup {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 340px;
    background-color: var(--input-bg);
    border: 2px solid var(--accent);
    border-radius: var(--border-radius-large);
    padding: 24px;
    z-index: 100;
    box-shadow: 0 8px 32px rgba(204, 255, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.4s var(--transition-smooth);
}

.registration-popup.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.popup-close {
    position: absolute;
    top: 12px;
    right: 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 24px;
    cursor: pointer;
    line-height: 1;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: color 0.3s ease, transform 0.3s ease;
}

.popup-close:hover {
    color: var(--accent);
    transform: rotate(90deg);
}

.popup-title {
    font-family: 'DM Serif Display', serif;
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.8rem;
    letter-spacing: -0.01em;
}

.popup-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.5;
    margin-bottom: 1.2rem;
}

.popup-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.popup-input-field {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--input-bg);
    border: 2px solid var(--input-border);
    border-radius: var(--border-radius-medium);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: 'Karla', sans-serif;
    outline: none;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.popup-input-field:focus {
    border-color: var(--accent);
    box-shadow: 0 0 12px rgba(204, 255, 0, 0.2);
}

.popup-input-field::placeholder {
    color: var(--text-secondary);
}

.popup-submit-button {
    width: 100%;
    padding: 0.8rem;
    background-color: var(--accent);
    border: none;
    border-radius: var(--border-radius-medium);
    color: var(--bg-dark);
    font-size: 1rem;
    font-weight: 600;
    font-family: 'Karla', sans-serif;
    cursor: pointer;
    transition: all 0.3s var(--transition-smooth);
    box-shadow: 0 2px 8px rgba(204, 255, 0, 0.3);
}

.popup-submit-button:hover {
    background-color: #b8e600;
    box-shadow: 0 4px 16px rgba(204, 255, 0, 0.5);
    transform: translateY(-2px);
}

.popup-submit-button:active {
    transform: translateY(0);
}

/* Mobile responsive styles for registration popup */
@media (max-width: 768px) {
    .registration-popup {
        width: calc(100% - 40px);
        right: 20px;
        left: 20px;
        bottom: 20px;
    }

    .registration-link {
        font-size: 0.9rem;
        position: relative;
        top: 0;
        left: 0;
        transform: none;
        display: block;
        text-align: center;
        margin-top: 15px;
    }
}

@media (max-width: 480px) {
    .registration-popup {
        width: calc(100% - 24px);
        right: 12px;
        left: 12px;
        bottom: 12px;
        padding: 20px;
    }

    .popup-title {
        font-size: 1.3rem;
    }

    .popup-text {
        font-size: 0.9rem;
    }

    .registration-link {
        font-size: 0.85rem;
        position: relative;
        top: 0;
        left: 0;
        transform: none;
        display: block;
        text-align: center;
        margin-top: 12px;
    }
}