/* ===== Google Font ===== */
@import url('https://fonts.googleapis.com/css2?family=Prompt:wght@300;400;600;700&display=swap');

/* ===== Dark Mode (Default) ===== */
:root {
    --primary: #00c896;
    --primary-dark: #00a87e;
    --primary-glow: rgba(0, 200, 150, 0.3);
    --danger: #ff4d6d;
    --danger-glow: rgba(255, 77, 109, 0.35);
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #22263a;
    --border: rgba(255, 255, 255, 0.08);
    --text: #e8eaf6;
    --text-muted: #7b82a0;
    --radius: 18px;
    --radius-sm: 10px;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --header-gradient: linear-gradient(135deg, #fff 30%, var(--primary));
    --input-bg: var(--surface2);
    --icon-select-bg: var(--surface);
}

/* ===== Light Mode ===== */
body.light-mode {
    --primary: #00b386;
    --primary-dark: #009970;
    --primary-glow: rgba(0, 179, 134, 0.25);
    --danger: #e8294a;
    --danger-glow: rgba(232, 41, 74, 0.3);
    --bg: #f0f4ff;
    --surface: #ffffff;
    --surface2: #fafafa;
    --border: rgba(0, 0, 0, 0.1);
    --text: #1a1d2e;
    --text-muted: #5a6080;
    --shadow: 0 8px 32px rgba(100, 120, 200, 0.12);
    --header-gradient: linear-gradient(135deg, #1a1d2e 30%, var(--primary));
    --input-bg: #f5f7ff;
    --icon-select-bg: #ffffff;
}

/* ===== Intro / Loading Screen ===== */
#intro-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: #f9f9f9;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 36px;
    padding: 32px 24px;
}

#intro-video {
    width: min(68vw, 260px);
    height: min(68vw, 260px);
    object-fit: cover;
    border-radius: 28px;
}

.loading-text {
    font-family: 'Prompt', sans-serif;
    font-size: 17px;
    font-weight: 400;
    letter-spacing: 5px;
    color: #00c896;
    animation: breathe 2.6s ease-in-out infinite;
}

@keyframes breathe {

    0%,
    100% {
        opacity: 0.1;
    }

    50% {
        opacity: 1;
    }
}

#intro-overlay.fade-out {
    animation: fadeOut 0.8s ease forwards;
}

@keyframes fadeOut {
    to {
        opacity: 0;
        pointer-events: none;
    }
}

/* ===== Base ===== */
* {
    box-sizing: border-box;
}

body {
    font-family: 'Prompt', 'Segoe UI', sans-serif;
    background: var(--bg);
    min-height: 100vh;
    color: var(--text);
    display: flex;
    justify-content: center;
    padding: 10px 12px 16px;
    margin: 0;
    transition: background 0.4s, color 0.4s;
    overflow-x: hidden;
}

.app-container {
    width: 100%;
    max-width: 420px;
}

/* ===== Top Bar (Language + Theme Toggle) ===== */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    position: relative;
    z-index: 200;
}

.language-switcher {
    display: flex;
    gap: 10px;
}

/* ===== Theme Toggle Button ===== */
.theme-toggle {
    width: 56px;
    height: 30px;
    background: var(--surface2);
    border-radius: 999px;
    border: 1.5px solid var(--border);
    position: relative;
    cursor: pointer;
    transition: background 0.35s, border-color 0.35s;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    padding: 0 4px;
}

.theme-toggle::before {
    content: '';
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: linear-gradient(135deg, #ffd700, #ff8c00);
    box-shadow: 0 0 8px rgba(255, 200, 0, 0.6);
    transition: transform 0.35s cubic-bezier(.4, 0, .2, 1), background 0.35s, box-shadow 0.35s;
    transform: translateX(0);
    flex-shrink: 0;
}

body.light-mode .theme-toggle::before {
    transform: translateX(26px);
    background: linear-gradient(135deg, #4a90e2, #1565c0);
    box-shadow: 0 0 8px rgba(74, 144, 226, 0.6);
}

.theme-toggle-icon {
    position: absolute;
    font-size: 13px;
    pointer-events: none;
    transition: opacity 0.3s;
}

.theme-toggle-icon.sun {
    right: 6px;
    opacity: 1;
}

.theme-toggle-icon.moon {
    left: 6px;
    opacity: 0;
}

body.light-mode .theme-toggle-icon.sun {
    opacity: 0;
}

body.light-mode .theme-toggle-icon.moon {
    opacity: 1;
}

/* ===== Icon Select ===== */
/* ===== Custom Dropdown ===== */
.custom-dropdown {
    position: relative;
    display: inline-block;
    z-index: 50;
}

.dropdown-trigger {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    border: none;
    background: var(--surface2);
    font-size: 22px;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s;
    display: flex;
    justify-content: center;
    align-items: center;
    outline: none;
}

.dropdown-trigger:hover {
    transform: scale(1.1);
    background: var(--surface);
    box-shadow: 0 4px 12px var(--primary-glow);
}

.dropdown-trigger:active {
    transform: scale(0.95);
}

.dropdown-panel {
    position: absolute;
    top: 54px;
    right: 0;
    width: 160px;
    background: rgba(20, 22, 30, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
    padding: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px) scale(0.9);
    transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
    border: 1px solid rgba(255, 255, 255, 0.08);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dropdown-panel.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-item {
    padding: 10px 14px;
    color: #e0e0e0;
    font-family: 'Prompt', sans-serif;
    font-size: 14px;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    font-weight: 500;
}

.dropdown-item:hover {
    background: var(--primary);
    color: #fff;
    transform: translateX(4px);
}

/* Light mode overrides for dropdown */
body.light-mode .dropdown-trigger {
    background: #fff;
}

body.light-mode .dropdown-panel {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.05);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

body.light-mode .dropdown-item {
    color: #444;
}

body.light-mode .dropdown-item:hover {
    background: var(--primary);
    color: #fff;
}


@keyframes wiggle {
    0% {
        transform: rotate(0deg);
    }

    25% {
        transform: rotate(-15deg);
    }

    50% {
        transform: rotate(12deg);
    }

    75% {
        transform: rotate(-8deg);
    }

    100% {
        transform: rotate(0deg);
    }
}


.select-icon {
    font-size: 20px;
}

#lang-select,
#currency-select {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

/* ===== Header ===== */
header {
    text-align: center;
    margin-bottom: 10px;
    background: var(--surface);
    padding: 12px 16px 10px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    position: relative;
    overflow: hidden;
    transition: background 0.4s, box-shadow 0.4s, border-color 0.4s;
}

.shimmer-bar {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), #00e5ff, var(--primary));
    animation: bar-glow 2.5s ease-in-out infinite;
}

@keyframes bar-glow {

    0%,
    100% {
        opacity: 0.4;
    }

    50% {
        opacity: 1;
    }
}

header h1 {
    font-size: 19px;
    font-weight: 700;
    margin: 0 0 6px;
    background: var(--header-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

header p {
    font-size: 13px;
    color: var(--text-muted);
    margin: 0;
}

/* ===== Product Cards ===== */
.product-card {
    background: var(--surface);
    padding: 12px 14px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin-bottom: 8px;
    border: 1px solid var(--border);
    transition: border-color 0.3s, box-shadow 0.3s, background 0.4s;
}

.product-card.winner {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary), 0 8px 32px var(--primary-glow);
    background: linear-gradient(160deg, var(--surface) 70%, rgba(0, 200, 150, 0.07));
}

h3 {
    margin: 0 0 8px;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ===== Inputs & Selects ===== */
input,
select {
    width: 100%;
    padding: 9px 12px;
    margin: 4px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    /* 16px prevents iOS zoom on focus */
    font-family: 'Prompt', sans-serif;
    box-sizing: border-box;
    appearance: none;
    -webkit-appearance: none;
    background-color: var(--input-bg);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.4s, color 0.4s;
    outline: none;
}

input:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

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

input[type="number"]::-webkit-outer-spin-button,
input[type="number"]::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

input[type="number"] {
    -moz-appearance: textfield;
}





.unit-group input {
    flex: 1;
}

/* Unit Custom Dropdown */
.unit-dropdown {
    flex: 2;
    width: 100%;
}

.unit-select-trigger {
    width: 100%;
    padding: 8px 12px;
    /* Slightly adjusted padding for 16px font */
    margin: 4px 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 16px;
    /* 16px to prevent iOS zoom */
    font-family: 'Prompt', sans-serif;
    background-color: var(--input-bg);
    color: var(--text);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.4s;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    /* Space between text and arrow */
    align-items: center;
    text-align: center;
    /* Center text */
}

/* Center text inside trigger but keep chevron on right? 
   User said "text in center".
   Flex justify-content: center might center everything including chevron.
   Let's use relative positioning for chevron or valid flex.
   Actually: text-align: center on trigger works if display block, but it's flex.
   Let's make the text span flex-grow 1 and text-align center.
*/
.unit-select-trigger span.selected-text {
    flex: 1;
    text-align: center;
}

.unit-select-trigger:hover {
    border-color: var(--primary);
}

.unit-select-trigger:active,
.unit-select-trigger.active {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.unit-dropdown .dropdown-panel {
    top: 100%;
    width: 100%;
    margin-top: 4px;
    right: auto;
    left: 0;
    z-index: 60;
}

.optgroup-label {
    padding: 8px 12px 4px;
    font-size: 12px;
    color: var(--primary);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0.8;
}

/* ===== VS Circle ===== */
.vs-circle {
    text-align: center;
    font-weight: 700;
    color: white;
    margin: 2px auto 8px;
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--danger), #c9184a);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 18px var(--danger-glow);
    animation: pulse 2s infinite;
    font-size: 14px;
    border: 2px solid rgba(255, 255, 255, 0.2);
}

@keyframes pulse {
    0% {
        transform: scale(1);
        box-shadow: 0 0 0 0 var(--danger-glow);
    }

    70% {
        transform: scale(1.1);
        box-shadow: 0 0 0 12px rgba(255, 77, 109, 0);
    }

    100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(255, 77, 109, 0);
    }
}

/* ===== Result Text ===== */
.result-text {
    font-weight: 600;
    margin-top: 6px;
    font-size: 14px;
    /* Slightly larger per modern standards if not specified, kept 12px or user pref? Original 12px but centering suggests focus. I'll stick to close to orig but cleaner.*/
    color: var(--text-muted);
    background: var(--surface2);
    padding: 7px 12px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    min-height: 42px;
    /* Increased for better touch/visibility */
    display: flex;
    align-items: center;
    justify-content: center;
    /* Center horizontally */
    text-align: center;
    transition: background 0.4s, border-color 0.4s;
}

/* ===== Unit Group Stacking ===== */
.unit-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 8px;
}

.promo-btn {
    width: 100%;
    padding: 10px 14px;
    background: transparent;
    border: 2px dashed var(--border);
    border-radius: 50px;
    /* pill shape */
    color: var(--text-muted);
    font-size: 13px;
    font-family: 'Prompt', sans-serif;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(.4, 0, .2, 1);
    margin-top: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.promo-btn::after {
    content: '🎁';
    font-size: 16px;
    transition: transform 0.3s;
}

.promo-btn:hover {
    border-color: var(--primary);
    border-style: solid;
    color: var(--primary);
    background: rgba(0, 200, 150, 0.06);
}

.promo-btn:hover::after {
    transform: rotate(-15deg) scale(1.2);
}

.promo-btn.active {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary));
    border: 2px solid transparent;
    color: white;
    font-weight: 700;
    box-shadow: 0 4px 18px var(--primary-glow);
    letter-spacing: 1px;
}

/* shimmer sweep on active */
.promo-btn.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: -60%;
    width: 50%;
    height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, 0.25), transparent);
    animation: shimmer 1.8s infinite;
}

.promo-btn.active::after {
    content: '✔ 1 แถม 1';
    font-size: 13px;
}

@keyframes shimmer {
    0% {
        left: -60%;
    }

    100% {
        left: 130%;
    }
}

/* ===== Footer ===== */
footer {
    background: var(--surface);
    padding: 12px;
    border-radius: var(--radius);
    margin-top: 4px;
    box-shadow: var(--shadow);
    border: 1px solid var(--border);
    transition: background 0.4s, box-shadow 0.4s, border-color 0.4s;
}

#summary-banner {
    background: var(--surface2);
    color: var(--text);
    padding: 10px;
    border-radius: var(--radius-sm);
    text-align: center;
    font-weight: 600;
    font-size: 13px;
    border: 1px solid var(--border);
    transition: background 0.4s, box-shadow 0.4s, color 0.4s;
}

.winner-banner {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary)) !important;
    box-shadow: 0 4px 20px var(--primary-glow) !important;
    color: white !important;
    border-color: transparent !important;
}

.error-banner {
    background: linear-gradient(135deg, #c9184a, var(--danger)) !important;
    box-shadow: 0 4px 20px var(--danger-glow) !important;
    color: white !important;
    border-color: transparent !important;
}

.neutral-banner {
    background: var(--surface2) !important;
    box-shadow: none !important;
    color: var(--text) !important;
}

/* Winner card highlight */
.winner {
    border: 2px solid var(--primary) !important;
    box-shadow: 0 0 0 3px var(--primary-glow), var(--shadow) !important;
}

.reset-btn {
    width: 100%;
    background: none;
    border: none;
    color: var(--danger);
    font-family: 'Prompt', sans-serif;
    font-size: 14px;
    margin-top: 16px;
    cursor: pointer;
    padding: 10px;
    border-radius: var(--radius-sm);
    transition: background 0.2s, color 0.2s;
    letter-spacing: 0.5px;
}

.reset-btn:hover {
    background: rgba(232, 41, 74, 0.1);
    color: #ff6b85;
}

/* ===== Light mode extra vibrancy ===== */
body.light-mode .product-card {
    background: linear-gradient(145deg, #ffffff, #f5f8ff);
}

body.light-mode header {
    background: linear-gradient(145deg, #ffffff, #eef2ff);
}

body.light-mode .vs-circle {
    background: linear-gradient(135deg, #ff4d6d, #ff1744);
}

body.light-mode body {
    background: linear-gradient(135deg, #e8f0fe 0%, #fce4ec 50%, #e8f5e9 100%);
}

/* Force center text for inputs and unit triggers */
input,
.unit-select-trigger {
    text-align: center;
}

.unit-select-trigger span.selected-text {
    flex: 1;
    text-align: center;
}