/* ========================================
   CSS Custom Properties (Design Tokens)
   ======================================== */
:root {
    /* Colors */
    --color-bg-primary: #0f0f1a;
    --color-bg-secondary: #1a1a2e;
    --color-bg-tertiary: #252540;
    --color-text-primary: #ffffff;
    --color-text-secondary: #a0a0b8;
    --color-text-muted: #6b6b80;

    /* Accent Colors */
    --color-accent-like: #ff4d6d;
    --color-accent-like-glow: rgba(255, 77, 109, 0.4);
    --color-accent-skip: #6b7280;
    --color-accent-match: #f472b6;
    --color-accent-link: #818cf8;

    /* Gradients */
    --gradient-card: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-like: linear-gradient(135deg, #ff416c 0%, #ff4b2b 100%);
    --gradient-match: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow-like: 0 0 30px var(--color-accent-like-glow);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;

    /* Typography */
    --font-family: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.25rem;
    --font-size-xl: 1.5rem;
    --font-size-2xl: 2rem;
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3.5rem;
}

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

html {
    font-size: 16px;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    line-height: 1.5;
}

#app {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Utility Classes
   ======================================== */
.hidden {
    display: none !important;
}

.muted {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

/* Glass morphism effect */
.glass-card {
    background: var(--gradient-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
}

/* ========================================
   Buttons
   ======================================== */
.btn {
    font-family: inherit;
    font-size: var(--font-size-base);
    font-weight: 500;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

.btn:focus {
    outline: 2px solid var(--color-accent-link);
    outline-offset: 2px;
}

.btn-primary {
    background: var(--gradient-card);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: var(--font-size-lg);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-md);
}

.btn-secondary:hover {
    background: var(--color-bg-secondary);
}

.btn-icon {
    background: transparent;
    color: var(--color-text-primary);
    padding: var(--spacing-sm);
    font-size: var(--font-size-xl);
    position: relative;
}

.btn-icon:hover {
    transform: scale(1.1);
}

.btn-icon .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--color-accent-like);
    color: white;
    font-size: 0.7rem;
    padding: 2px 6px;
    border-radius: var(--radius-full);
    font-weight: 600;
}

.btn-small {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: var(--font-size-sm);
    border-radius: var(--radius-sm);
}

.btn-small:hover {
    background: var(--color-bg-secondary);
}

.btn-danger {
    background: var(--color-accent-like);
}

.btn-danger:hover {
    filter: brightness(1.1);
}

.btn-action {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-full);
    font-size: var(--font-size-2xl);
    box-shadow: var(--shadow-md);
}

.btn-skip {
    background: var(--color-bg-tertiary);
    color: var(--color-accent-skip);
}

.btn-skip:hover {
    background: var(--color-bg-secondary);
    transform: scale(1.1);
}

.btn-like {
    background: var(--gradient-like);
    color: white;
}

.btn-like:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-glow-like);
}

/* ========================================
   Screen Layout
   ======================================== */
.screen {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========================================
   Loading Screen
   ======================================== */
#loading-screen {
    background: radial-gradient(ellipse at center, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
}

.loading-container {
    text-align: center;
    max-width: 300px;
    width: 100%;
}

.loading-spinner {
    font-size: 4rem;
    margin-bottom: var(--spacing-lg);
    animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }
}

.loading-text {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xl);
}

.progress-bar-container {
    width: 100%;
    height: 8px;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: var(--gradient-card);
    border-radius: var(--radius-full);
    transition: width 0.3s ease-out;
}

/* ========================================
   Setup Screen
   ======================================== */
#setup-screen {
    background: radial-gradient(ellipse at center, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
    justify-content: center;
    align-items: center;
    padding: var(--spacing-lg);
}

.setup-container {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-2xl);
    text-align: center;
}

.logo {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-card);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
}

.setup-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.setup-form label {
    font-size: var(--font-size-lg);
    font-weight: 500;
    text-align: left;
}

.setup-form input {
    width: 100%;
    padding: var(--spacing-md);
    font-size: var(--font-size-lg);
    background: var(--color-bg-secondary);
    border: 2px solid var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    font-family: inherit;
    transition: border-color var(--transition-normal);
}

.setup-form input:focus {
    outline: none;
    border-color: var(--color-accent-link);
}

.setup-form input::placeholder {
    color: var(--color-text-muted);
}

/* ========================================
   Header
   ======================================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-bg-tertiary);
}

.header-logo {
    font-size: var(--font-size-2xl);
}

.header-actions {
    display: flex;
    gap: var(--spacing-sm);
}

.header h2 {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.header-spacer {
    width: 40px;
}

/* ========================================
   Swipe Container & Cards
   ======================================== */
.swipe-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    position: relative;
}

.card-stack {
    position: relative;
    width: 100%;
    max-width: 340px;
    height: 420px;
}

.name-card {
    position: absolute;
    width: 100%;
    height: 100%;
    background: var(--gradient-card);
    border-radius: var(--radius-xl);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    box-shadow: var(--shadow-lg);
    cursor: grab;
    user-select: none;
    touch-action: none;
    transition: transform 0.1s ease-out;
}

.name-card:active {
    cursor: grabbing;
}

.name-card.swiping-right {
    background: linear-gradient(135deg, #22c55e 0%, #16a34a 100%);
}

.name-card.swiping-left {
    background: linear-gradient(135deg, #6b7280 0%, #4b5563 100%);
}

.name-card.exiting {
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
    pointer-events: none;
}

.card-content {
    text-align: center;
    padding: var(--spacing-xl);
}

.first-name {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.last-name {
    font-size: var(--font-size-xl);
    font-weight: 400;
    opacity: 0.9;
}

.card-hint {
    position: absolute;
    top: var(--spacing-lg);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--font-size-lg);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.card-hint.like {
    right: var(--spacing-lg);
    background: rgba(34, 197, 94, 0.9);
    color: white;
}

.card-hint.skip {
    left: var(--spacing-lg);
    background: rgba(107, 114, 128, 0.9);
    color: white;
}

.name-card.swiping-right .card-hint.like,
.name-card.swiping-left .card-hint.skip {
    opacity: 1;
}

/* Stacked cards behind */
.name-card:nth-child(2) {
    transform: scale(0.95) translateY(12px);
    z-index: -1;
    opacity: 0.7;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
        opacity 0.3s ease;
}

.name-card:nth-child(3) {
    transform: scale(0.9) translateY(24px);
    z-index: -2;
    opacity: 0;
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1),
        opacity 0.3s ease;
}

/* Card entrance animation - new top card appearing */
.name-card.card-entering {
    animation: cardEnter 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes cardEnter {
    0% {
        transform: scale(0.95) translateY(12px);
        opacity: 0.7;
    }

    100% {
        transform: scale(1) translateY(0);
        opacity: 1;
    }
}

/* Card shifting up from position 3 to 2 */
.name-card.card-shifting-up {
    animation: cardShiftUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes cardShiftUp {
    0% {
        transform: scale(0.9) translateY(24px);
        opacity: 0.4;
    }

    100% {
        transform: scale(0.95) translateY(12px);
        opacity: 0.7;
    }
}

/* New card appearing at the bottom of stack */
.name-card.card-new {
    animation: cardNew 0.4s ease-out forwards;
}

@keyframes cardNew {
    0% {
        transform: scale(0.85) translateY(36px);
        opacity: 0;
    }

    100% {
        transform: scale(0.9) translateY(24px);
        opacity: 0.4;
    }
}

/* Empty state */
.empty-state {
    text-align: center;
    color: var(--color-text-secondary);
}

.empty-state p {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   Swipe Actions
   ======================================== */
.swipe-actions {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-bg-tertiary);
}

/* ========================================
   Connection Bar
   ======================================== */
.connection-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(90deg, rgba(168, 85, 247, 0.2) 0%, rgba(236, 72, 153, 0.2) 100%);
    border-top: 1px solid rgba(168, 85, 247, 0.3);
    flex-wrap: wrap;
}

#connection-status {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* ========================================
   Names List (Likes/Matches)
   ======================================== */
.names-list {
    flex: 1;
    padding: var(--spacing-md);
    overflow-y: auto;
}

.name-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    transition: background var(--transition-normal);
}

.name-item:hover {
    background: var(--color-bg-tertiary);
}

.name-item-text {
    font-size: var(--font-size-lg);
    font-weight: 500;
}

.name-item-delete {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--spacing-sm);
    font-size: var(--font-size-lg);
    transition: color var(--transition-normal);
}

.name-item-delete:hover {
    color: var(--color-accent-like);
}

.empty-list {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: var(--spacing-2xl);
}

.empty-list p:first-child {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

/* ========================================
   Modal
   ======================================== */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 420px;
    padding: var(--spacing-2xl);
    z-index: 1;
}

.modal-close {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    font-size: var(--font-size-lg);
}

.modal-content h2 {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.session-section {
    text-align: center;
}

.session-section p {
    margin-bottom: var(--spacing-md);
}

/* Session status indicator */
.session-status {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

.session-status .status-icon {
    font-size: var(--font-size-lg);
}

.session-status.status-loading .status-icon {
    animation: spin 1s linear infinite;
}

.session-status.status-connected {
    background: rgba(34, 197, 94, 0.2);
    color: #22c55e;
}

.session-status.status-error {
    background: rgba(239, 68, 68, 0.2);
    color: #ef4444;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

.success-text {
    color: #22c55e;
    font-weight: 500;
}

.link-box {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.link-box input {
    flex: 1;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: inherit;
    font-size: var(--font-size-sm);
}

.divider {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    color: var(--color-text-muted);
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-bg-tertiary);
}

.advanced-settings {
    margin-top: var(--spacing-xl);
    text-align: left;
}

.advanced-settings summary {
    cursor: pointer;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.advanced-settings summary:hover {
    color: var(--color-text-secondary);
}

.settings-content {
    margin-top: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.settings-content label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.settings-content input {
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    font-family: inherit;
}

/* ========================================
   Match Overlay
   ======================================== */
.match-overlay {
    position: fixed;
    inset: 0;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(240, 147, 251, 0.95) 0%, rgba(245, 87, 108, 0.95) 100%);
    animation: matchFadeIn 0.5s ease-out;
}

@keyframes matchFadeIn {
    from {
        opacity: 0;
        transform: scale(0.8);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.match-content {
    text-align: center;
    z-index: 1;
}

.match-hearts {
    font-size: 5rem;
    animation: heartBeat 1s ease-in-out infinite;
}

@keyframes heartBeat {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.2);
    }
}

.match-content h2 {
    font-size: var(--font-size-3xl);
    margin: var(--spacing-md) 0;
}

.match-name {
    font-size: var(--font-size-2xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

/* Confetti */
.confetti-container {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.confetti {
    position: absolute;
    width: 10px;
    height: 10px;
    background: white;
    animation: confettiFall 3s ease-out forwards;
}

@keyframes confettiFall {
    0% {
        transform: translateY(-100vh) rotate(0deg);
        opacity: 1;
    }

    100% {
        transform: translateY(100vh) rotate(720deg);
        opacity: 0;
    }
}

/* ========================================
   Responsive Design
   ======================================== */
@media (max-width: 480px) {
    .card-stack {
        max-width: 300px;
        height: 380px;
    }

    .first-name {
        font-size: var(--font-size-3xl);
    }

    .swipe-actions {
        gap: var(--spacing-xl);
    }

    .btn-action {
        width: 56px;
        height: 56px;
        font-size: var(--font-size-xl);
    }

    .connection-bar {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
}

@media (min-width: 768px) {
    .card-stack {
        max-width: 380px;
        height: 480px;
    }

    .first-name {
        font-size: 4rem;
    }
}