/* ============================================
   SHARED: BASE STYLES
   Версия: 8.24 - No Blobs, Simple Gradient
   
   ИЗМЕНЕНИЯ v8.24:
   - Aurora orbs: display:none (блобы полностью убраны)
   - Aurora mesh: без filter blur
   - Звёзды: убран twinkle с слоёв 1-2 для экономии
   - .glass-card: без backdrop-filter
   - .btn-secondary: без backdrop-filter
   - .screen: contain для изоляции
   
   ИЗМЕНЕНИЯ v8.22:
   - Скрыты все кнопки "Назад" на блоках
   ============================================ */

/* ============================================
   GOOGLE FONTS — Inter
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ============================================
   RESET
   ============================================ */

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

/* ============================================
   HIDE BACK BUTTONS - TG Header has back
   ============================================ */

.back-btn,
.btn-back {
    display: none !important;
}

/* ============================================
   HTML & BODY - FORCED DARK
   ============================================ */

html {
    overflow: hidden !important;
    height: var(--app-height) !important;
    background: var(--bg-void) !important;
    background-color: var(--bg-void) !important;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

html, body {
    overscroll-behavior: none;
    -webkit-overflow-scrolling: touch;
}

body {
    font-family: var(--font-family) !important;
    background: var(--bg-void) !important;
    background-color: var(--bg-void) !important;
    color: #e8edf4 !important;
    line-height: 1.5;
    letter-spacing: var(--tracking-normal);
    -webkit-tap-highlight-color: transparent;
    overflow: hidden !important;
    height: var(--app-height) !important;
}

/* ============================================
   AURORA BACKGROUND
   ============================================ */

.aurora-container {
    position: fixed;
    inset: 0;
    z-index: var(--z-aurora);
    overflow: hidden;
    pointer-events: none;
}

/* ============================================
   STARS - Падающие звёзды
   ============================================ */

/* Слой 1: Медленные звёзды (40s) */
.aurora-container::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 200%;
    top: 0;
    left: 0;
    z-index: 10;
    background-image:
        radial-gradient(1px 1px at 50px 50px, rgba(255,255,255,0.6), transparent),
        radial-gradient(1px 1px at 150px 180px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 280px 90px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 380px 250px, rgba(255,255,255,0.55), transparent),
        radial-gradient(1px 1px at 100px 350px, rgba(255,255,255,0.45), transparent),
        radial-gradient(1px 1px at 220px 450px, rgba(255,255,255,0.5), transparent),
        radial-gradient(1px 1px at 350px 380px, rgba(255,255,255,0.4), transparent),
        radial-gradient(1px 1px at 450px 150px, rgba(255,255,255,0.55), transparent);
    background-size: 500px 600px;
    animation: starsFall 40s linear infinite;
}

/* Слой 2: Средние звёзды (25s) */
.aurora-container::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 200%;
    top: 0;
    left: 0;
    z-index: 11;
    background-image:
        radial-gradient(0.8px 0.8px at 80px 30px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.8px 0.8px at 200px 120px, rgba(255,255,255,0.45), transparent),
        radial-gradient(0.8px 0.8px at 320px 200px, rgba(255,255,255,0.55), transparent),
        radial-gradient(0.8px 0.8px at 420px 80px, rgba(255,255,255,0.4), transparent),
        radial-gradient(0.8px 0.8px at 60px 280px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.8px 0.8px at 180px 350px, rgba(255,255,255,0.45), transparent),
        radial-gradient(0.8px 0.8px at 300px 420px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.8px 0.8px at 400px 300px, rgba(255,255,255,0.4), transparent),
        radial-gradient(0.8px 0.8px at 130px 480px, rgba(255,255,255,0.55), transparent),
        radial-gradient(0.8px 0.8px at 260px 550px, rgba(255,255,255,0.45), transparent);
    background-size: 480px 650px;
    animation: starsFall 25s linear infinite;
}

@keyframes starsFall {
    0% { transform: translateY(0); }
    100% { transform: translateY(-50%); }
}

@keyframes starsTwinkle {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

/* Слой 3: Быстрые звёзды (15s) */
.aurora-stars-fast {
    position: absolute;
    width: 100%;
    height: 200%;
    top: 0;
    left: 0;
    z-index: 12;
    background-image:
        radial-gradient(0.6px 0.6px at 30px 70px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.6px 0.6px at 120px 150px, rgba(255,255,255,0.4), transparent),
        radial-gradient(0.6px 0.6px at 250px 50px, rgba(255,255,255,0.55), transparent),
        radial-gradient(0.6px 0.6px at 350px 180px, rgba(255,255,255,0.45), transparent),
        radial-gradient(0.6px 0.6px at 70px 300px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.6px 0.6px at 180px 400px, rgba(255,255,255,0.4), transparent),
        radial-gradient(0.6px 0.6px at 300px 320px, rgba(255,255,255,0.55), transparent),
        radial-gradient(0.6px 0.6px at 420px 250px, rgba(255,255,255,0.45), transparent),
        radial-gradient(0.6px 0.6px at 150px 520px, rgba(255,255,255,0.5), transparent),
        radial-gradient(0.6px 0.6px at 280px 580px, rgba(255,255,255,0.4), transparent),
        radial-gradient(0.6px 0.6px at 400px 480px, rgba(255,255,255,0.55), transparent),
        radial-gradient(0.6px 0.6px at 50px 620px, rgba(255,255,255,0.45), transparent);
    background-size: 450px 700px;
    animation: starsFall 15s linear infinite, starsTwinkle 2s ease-in-out infinite 0.5s;
}

/* Mesh — static gradient (no filter) */
.aurora-mesh {
    position: absolute;
    width: 200%;
    height: 200%;
    top: -50%;
    left: -50%;
    background: 
        radial-gradient(ellipse 50% 80% at 20% 40%, var(--aurora-mesh-blue) 0%, transparent 50%),
        radial-gradient(ellipse 60% 50% at 80% 50%, var(--aurora-mesh-purple) 0%, transparent 50%),
        radial-gradient(ellipse 40% 60% at 40% 80%, var(--aurora-mesh-cyan) 0%, transparent 50%);
    filter: none;
    will-change: auto;
}

/* Orbs — HIDDEN (v8.24: simple gradient instead) */
.aurora-orb {
    position: absolute;
    border-radius: 50%;
    filter: none;
    mix-blend-mode: normal;
    will-change: auto;
    display: none !important;
}

.aurora-orb--primary,
.aurora-orb--secondary,
.aurora-orb--accent {
    display: none !important;
}

/* Particles — HIDDEN */
.aurora-particles {
    position: absolute;
    inset: 0;
    display: none !important;
}

.aurora-particle {
    display: none !important;
}

/* Noise overlay */
.aurora-noise {
    position: absolute;
    inset: 0;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    opacity: var(--aurora-noise-opacity);
    mix-blend-mode: overlay;
}

/* ============================================
   APP CONTAINER
   ============================================ */

.app-container {
    position: relative;
    width: 100%;
    max-width: var(--app-max-width);
    height: var(--app-height);
    margin: 0 auto;
    overflow: hidden;
    background: transparent !important;
    display: flex;
    flex-direction: column;
}

/* Desktop shadow */
@media (min-width: 520px) {
    body {
        background: #030305 !important;
    }
    
    .app-container {
        margin-top: 32px;
        height: calc(var(--app-height) - 64px);
        border-radius: var(--radius-xl);
        box-shadow: 0 0 60px rgba(0, 0, 0, 0.5);
        overflow: hidden;

        /* Makes .app-container a containing block for position:fixed
           descendants. All modals/overlays mounted inside .app-container
           will be positioned relative to it (480px column), not to
           viewport. Foundation for desktop adaptation — new overlays
           work correctly by default as long as they are DOM descendants
           of .app-container (NOT document.body).

           Spec: CSS Containment Level 1 — "Giving an element layout
           containment causes it to act as a containing block for
           absolutely and fixed positioned descendants."

           Desktop-only: on mobile .app-container spans full viewport
           anyway, so containment has no effect there. */
        contain: layout;
    }
}

/* ============================================
   SCREENS - BASE RULE
   ============================================ */

.screen {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    
    padding-top: var(--content-top);
    padding-left: var(--screen-padding-x);
    padding-right: var(--screen-padding-x);
    padding-bottom: 0;
    
    overflow-x: hidden;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    
    z-index: var(--z-content);
    background: transparent !important;
    
    display: none;
    flex-direction: column;
    
    contain: paint;
}

.screen.active {
    display: flex;
}

/* Bottom clearance — real DOM element instead of padding-bottom.
   iOS WebKit ignores padding-bottom on absolute-positioned scroll containers.
   ::after as flex-child creates actual scroll space that WebKit cannot skip. */
.screen::after {
    content: '';
    display: block;
    flex-shrink: 0;
    height: var(--content-bottom);
}

/* Scroll locked */
.screen.scroll-locked {
    overflow-y: hidden !important;
    touch-action: none;
}

/* Fullscreen screens — minimal top & bottom clearance (safe areas only).
   Used by splashes with no header/bottom-bar (loading, errors). */
.screen--fullscreen {
    padding-top: var(--content-top-none);
}

.screen--fullscreen::after {
    height: var(--content-bottom-none);
}

/* ============================================
   SCREENS WITH BUILT-IN HEADER
   ============================================ */

#resultsScreen,
#comparisonScreen,
#hotelDetailsScreen,
#bookingScreen,
#bookingResultScreen,
#profileScreen,
#bookingsHistoryScreen,
#adminScreen {
    padding-top: calc(var(--top-offset) + 8px);
}

/* ============================================
   GLASS CARD — NO backdrop-filter
   ============================================ */

.glass-card {
    background: rgba(30, 42, 58, 0.7);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xxl);
    font-family: inherit;
    font-size: var(--font-size-md);
    font-weight: var(--font-weight-semibold);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-normal) var(--ease-out);
    -webkit-tap-highlight-color: transparent;
    position: relative;
    overflow: hidden;
}

.btn:active {
    transform: scale(0.98);
}

/* Primary Button */
.btn-primary {
    background: var(--accent-gradient);
    color: white;
    min-height: var(--button-height);
    box-shadow: var(--shadow-cta);
}

.btn-primary::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, rgba(255,255,255,0.15) 0%, transparent 50%);
}

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

/* Secondary Button — NO backdrop-filter */
.btn-secondary {
    background: rgba(30, 42, 58, 0.7);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

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

/* ============================================
   INPUTS
   ============================================ */

input[type="text"],
input[type="email"],
input[type="tel"],
input[type="number"],
input[type="date"],
select {
    width: 100%;
    height: var(--input-height);
    padding: 0 var(--spacing-lg);
    font-family: inherit;
    font-size: var(--input-font-size);
    font-weight: var(--font-weight-medium);
    color: var(--text-primary);
    background: var(--bg-elevated) !important;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    outline: none;
    transition: all var(--transition-fast) var(--ease-smooth);
    -webkit-appearance: none;
}

input::placeholder {
    color: var(--text-disabled);
}

input:focus,
select:focus {
    background: var(--glass-bg-active) !important;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

/* Select arrow */
select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%238899ab' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
    cursor: pointer;
}

/* Date input */
input[type="date"]::-webkit-calendar-picker-indicator {
    opacity: 0.5;
    filter: invert(1);
    cursor: pointer;
}

/* ============================================
   SCROLLBAR
   ============================================ */

::-webkit-scrollbar {
    width: 4px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--text-tertiary);
    border-radius: 2px;
}

/* ============================================
   SELECTION
   ============================================ */

::selection {
    background: var(--accent-primary);
    color: white;
}

/* ============================================
   FOCUS VISIBLE
   ============================================ */

:focus-visible {
    outline: 2px solid var(--accent-primary);
    outline-offset: 2px;
}

/* ============================================
   DISABLED STATE
   ============================================ */

[disabled],
.disabled {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

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

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

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

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

/* ============================================
   KEYBOARD OPEN STATE
   ============================================ */

body.keyboard-open .bottom-bar {
    opacity: 0 !important;
    pointer-events: none !important;
    transform: translateX(-50%) translateY(100%) !important;
}

/* ============================================
   AURORA OFF STATE (Form Mode)
   ============================================ */

/* Stars: hide when aurora off */
body.aurora-off .aurora-container::before,
body.aurora-off .aurora-container::after,
body.aurora-off .aurora-stars-fast {
    animation: none !important;
    opacity: 0 !important;
    visibility: hidden !important;
    transition: opacity 0.3s ease-out;
}

/* Top glow fades in */
body.aurora-off .aurora-mesh-form {
    opacity: 1;
    visibility: visible;
    transition: opacity 2s ease-out, visibility 0s linear 0s;
    animation: aurora-form-breathe 10s ease-in-out infinite;
}

/* Background darkens for form mode */
body.aurora-off .aurora-container {
    background: linear-gradient(
        180deg,
        #151320 0%,
        #100e18 50%,
        #0c0a12 100%
    ) !important;
}

body.aurora-off .app-container {
    background: transparent !important;
}

/* Form glass effect */
body.aurora-off .search-form {
    background: rgba(255, 255, 255, 0.06) !important;
    border: 1px solid rgba(255, 255, 255, 0.15) !important;
}