/* -------------------------------------------------------------
 * CHRONOS DESIGN SYSTEM & STYLESHEET
 * Premium Mobile-First Architecture, Glassmorphism, & Decade Themes
 * ------------------------------------------------------------- */

/* ==========================================
   1. CORE VARIABLES & DEFAULT PREMIUM DARK
   ========================================== */
:root {
    /* Fonts */
    --font-primary: 'Inter', sans-serif;
    --font-heading: 'Outfit', sans-serif;
    --font-mono: 'Share Tech Mono', monospace;
    --font-serif: 'Playfair Display', serif;

    /* Base Palette (Warm Cream Theme Default) */
    --bg-main: #FAF5EB;
    --bg-glow-1-color: rgba(12, 35, 64, 0.08); /* Navy glow */
    --bg-glow-2-color: rgba(13, 92, 58, 0.05);  /* Emerald glow */
    --bg-glow-3-color: rgba(180, 83, 9, 0.04);  /* Amber glow */
    
    /* Card/Glass Tokens */
    --glass-bg: rgba(255, 255, 255, 0.75);
    --glass-border: rgba(12, 35, 64, 0.06);
    --glass-border-focus: rgba(12, 35, 64, 0.25);
    --glass-shadow: 0 10px 30px -10px rgba(12, 35, 64, 0.06), 0 1px 3px rgba(12, 35, 64, 0.02);
    
    /* Typography Colors */
    --text-main: #0F172A;
    --text-muted: #334155;
    --text-inverse: #ffffff;
    
    /* Functional Accents */
    --primary: #0C2340;
    --primary-glow: rgba(12, 35, 64, 0.15);
    --secondary: #0D5C3A;
    --secondary-glow: rgba(13, 92, 58, 0.12);
    --accent: #B45309;
    
    /* Special Details */
    --card-gradient: linear-gradient(135deg, rgba(255, 255, 255, 0.7) 0%, rgba(255, 255, 255, 0.4) 100%);
    --button-gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    --button-gradient-hover: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
    
    /* Responsive Layout Variables (Overwritten by Media Queries) */
    --card-padding: 20px;
    --border-radius-lg: 16px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    --transition-speed: 0.3s;
    --transition-ease: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   4. LAYOUT & MOBILE-FIRST BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    width: 100%;
    min-height: 100vh;
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color var(--transition-speed) var(--transition-ease), color var(--transition-speed) var(--transition-ease);
}

/* Ambient glow nodes in the background */
.ambient-glow {
    position: fixed;
    border-radius: 50%;
    filter: blur(100px);
    z-index: -1;
    pointer-events: none;
    transition: background-color 1s var(--transition-ease);
}

.bg-glow-1 {
    top: 5%;
    left: 5%;
    width: 280px;
    height: 280px;
    background-color: var(--bg-glow-1-color);
}

.bg-glow-2 {
    bottom: 10%;
    right: 5%;
    width: 320px;
    height: 320px;
    background-color: var(--bg-glow-2-color);
}

.bg-glow-3 {
    top: 40%;
    left: 40%;
    width: 250px;
    height: 250px;
    background-color: var(--bg-glow-3-color);
}

/* Confetti Canvas overlays all */
#confetti-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    pointer-events: none;
}

/* Base Mobile Container */
.app-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    min-height: 100vh;
}

.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--glass-border);
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-icon {
    font-size: 1.65rem;
    animation: rotateHourglass 4s ease-in-out infinite;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.4rem;
    letter-spacing: 2px;
    background: linear-gradient(135deg, var(--primary) 30%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.1;
}

.logo-details {
    display: flex;
    flex-direction: column;
}

.logo-subtitle {
    font-size: 0.58rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    line-height: 1.2;
    margin-top: 1px;
}

@media (min-width: 768px) {
    .logo-subtitle {
        font-size: 0.65rem;
        letter-spacing: 1px;
    }
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.1rem;
    box-shadow: var(--glass-shadow);
    transition: all var(--transition-speed) var(--transition-ease);
}

.icon-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary-glow);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.2);
}

.theme-icon-sun {
    display: none;
}
[data-theme="light"] .theme-icon-sun {
    display: block;
}
[data-theme="light"] .theme-icon-moon {
    display: none;
}

/* ==========================================
   5. COMPONENT: MOBILE-FIRST GLASS CARD
   ========================================== */
.glass-card {
    background: var(--glass-bg);
    background-image: var(--card-gradient);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-lg);
    padding: var(--card-padding);
    box-shadow: var(--glass-shadow);
    position: relative;
    overflow: hidden;
    transition: border-color var(--transition-speed) var(--transition-ease), transform var(--transition-speed) var(--transition-ease), box-shadow var(--transition-speed) var(--transition-ease);
}

.glass-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -150%;
    width: 50%;
    height: 100%;
    background: linear-gradient(to right, rgba(255,255,255,0) 0%, rgba(255,255,255,0.02) 50%, rgba(255,255,255,0) 100%);
    transform: skewX(-25deg);
    transition: 0.75s;
    pointer-events: none;
}

.glass-card:hover::before {
    left: 150%;
}

.glass-card:hover {
    border-color: rgba(255, 255, 255, 0.12);
}

.card-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    letter-spacing: 1px;
    color: var(--secondary);
    background: rgba(13, 92, 58, 0.08);
    padding: 3px 8px;
    border-radius: 50px;
    border: 1px solid rgba(13, 92, 58, 0.18);
}

.card-badge.pulse::before {
    content: '';
    display: inline-block;
    width: 5px;
    height: 5px;
    background-color: var(--accent);
    border-radius: 50%;
    margin-right: 4px;
    vertical-align: middle;
    box-shadow: 0 0 6px var(--accent);
    animation: pulseGlow 1.5s infinite;
}

.card-title {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 6px;
    letter-spacing: -0.3px;
    padding-right: 80px; /* Leave space for absolute badge on mobile */
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 20px;
    line-height: 1.4;
}

/* ==========================================
   6. SECTION: MOBILE-FIRST FORM
   ========================================== */
.form-section {
    max-width: 680px;
    margin: 0 auto 32px auto;
    width: 100%;
    transition: margin var(--transition-speed) var(--transition-ease);
}

@media (min-width: 768px) {
    .form-section {
        margin-bottom: 48px;
    }
}

.form-card {
    border-top: 4px solid var(--primary);
}

.form-title {
    margin-top: 6px;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-weight: 600;
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form-group label .required {
    color: var(--secondary);
}

.form-group label .optional {
    color: var(--text-muted);
    font-size: 0.7rem;
    text-transform: lowercase;
}

/* Single Column by default on Mobile */
.form-group-row {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0px;
}

.input-wrapper {
    position: relative;
    width: 100%;
}

.styled-input {
    width: 100%;
    background: #FFFFFF;
    border: 1px solid var(--glass-border);
    padding: 12px 14px;
    border-radius: var(--border-radius-md);
    color: var(--text-main);
    font-family: var(--font-primary);
    font-size: 0.95rem;
    outline: none;
    transition: all var(--transition-speed) var(--transition-ease);
}

.styled-input:focus {
    border-color: var(--primary);
    background: #FFFFFF;
    box-shadow: 0 0 12px var(--primary-glow);
}

.toggle-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.15);
    border: 1px solid var(--glass-border);
    padding: 10px 14px;
    border-radius: var(--border-radius-md);
    height: 48px;
    margin-bottom: 20px;
}

.toggle-label {
    font-size: 0.85rem;
    font-weight: 500;
}

.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 22px;
}

.switch input { 
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--text-muted);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--primary);
}

input:checked + .slider:before {
    transform: translateX(22px);
}

.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

.primary-btn {
    width: 100%;
    background: var(--button-gradient);
    border: none;
    padding: 14px 28px;
    color: var(--text-inverse);
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: 1px;
    border-radius: var(--border-radius-md);
    cursor: pointer;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.25);
    transition: all var(--transition-speed) var(--transition-ease);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.35);
    background: var(--button-gradient-hover);
}

/* ==========================================
   7. MOBILE-FIRST RESULTS & DASHBOARD
   ========================================== */
.results-section {
    display: flex;
    flex-direction: column;
    gap: 28px;
    animation: fadeInUp 0.8s var(--transition-ease);
}

.results-section.hidden {
    display: none;
}

/* Single column default for mobile */
.results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}

.span-2, .span-3 {
    grid-column: span 1;
}

/* --- Ticking Lifespan --- */
.highlight-card {
    border-left: 4px solid var(--secondary);
}

.ticking-dashboard {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.primary-ticking {
    display: flex;
    align-items: baseline;
    gap: 6px;
    flex-wrap: wrap;
}

.tick-number {
    font-family: var(--font-heading);
    font-size: 2.75rem;
    font-weight: 800;
    line-height: 1;
    letter-spacing: -1.5px;
    background: linear-gradient(135deg, var(--text-main) 30%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tick-label {
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-right: 10px;
    text-transform: lowercase;
}

.micro-ticking-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr); /* 2 Columns on mobile */
    gap: 12px;
    background: rgba(12, 35, 64, 0.04);
    padding: 14px;
    border-radius: var(--border-radius-md);
    border: 1px solid var(--glass-border);
}

.micro-counter {
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 6px;
}

.micro-number {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 600;
}

.micro-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.highlight-micro .micro-number {
    color: var(--secondary);
}

/* --- Circular Progress Ring --- */
.circular-progress-container {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 14px 0;
}

.progress-ring {
    transform: rotate(-90deg);
}

.progress-ring-fill {
    transition: stroke-dashoffset 0.6s var(--transition-ease);
}

.progress-content {
    position: absolute;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.days-number {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 800;
    line-height: 1;
}

.days-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.time-countdown-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    text-align: center;
    gap: 8px;
    border-top: 1px solid var(--glass-border);
    padding-top: 14px;
}

.c-number {
    display: block;
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 600;
}

.c-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

/* --- Astro Cards & Spiritual --- */
.astro-card {
    display: flex;
    flex-direction: column;
}

.zodiac-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.astro-icon {
    font-size: 2.2rem;
    width: 52px;
    height: 52px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(12, 35, 64, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
}

.astro-name {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 700;
}

.astro-dates {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.astro-details {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.detail-row {
    display: flex;
    justify-content: space-between;
    border-bottom: 1px solid var(--glass-border);
    padding-bottom: 6px;
    font-size: 0.85rem;
}

.zodiac-paragraph-desc {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid var(--glass-border);
}

/* --- Treasures --- */
.treasures-flex {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.treasure-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.treasure-visual {
    font-size: 1.75rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(12, 35, 64, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
}

.treasure-title {
    font-size: 1rem;
    font-weight: 700;
}

.treasure-label {
    font-size: 0.7rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.treasure-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* --- Generation Card --- */
.generation-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
}

.gen-title {
    font-size: 1.35rem;
    font-weight: 700;
}

.gen-tag {
    font-family: var(--font-mono);
    font-size: 0.75rem;
}

.gen-desc-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.gen-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    border-top: 1px solid var(--glass-border);
    padding-top: 14px;
}

.metric-lbl {
    font-size: 0.7rem;
    color: var(--text-muted);
}

.metric-val {
    font-weight: 600;
    font-size: 0.85rem;
}

/* --- Pop Culture --- */
.pop-culture-grid {
    display: grid;
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 16px;
}

.culture-subcard {
    display: flex;
    gap: 12px;
    background: rgba(12, 35, 64, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    padding: 16px;
}

.subcard-icon {
    font-size: 1.75rem;
}

.subcard-meta {
    font-size: 0.65rem;
}

.subcard-name {
    font-size: 1.05rem;
}

.subcard-author {
    font-size: 0.8rem;
    margin-bottom: 6px;
}

.subcard-trivia {
    font-size: 0.75rem;
}

/* --- History twins --- */
.history-grid {
    display: grid;
    grid-template-columns: 1fr; /* Single column on mobile */
    gap: 16px;
}

.history-item {
    background: rgba(12, 35, 64, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-md);
    padding: 16px;
    min-height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.history-year {
    font-family: var(--font-mono);
    font-size: 1.15rem;
}

.history-name {
    font-size: 0.95rem;
    font-weight: 600;
}

.history-desc {
    font-size: 0.75rem;
}

.history-tag {
    margin-top: 8px;
    font-size: 0.65rem;
}

/* --- US President Card --- */
.president-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 8px;
}

.president-avatar {
    font-size: 3rem;
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(12, 35, 64, 0.02);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    align-self: center;
    box-shadow: inset 0 2px 10px rgba(12, 35, 64, 0.03);
}

.president-bio {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.president-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.president-name {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 700;
}

.president-party-badge {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 4px 10px;
    border-radius: 4px;
}

.party-democratic {
    background: rgba(59, 130, 246, 0.1);
    color: #1d4ed8;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

.party-republican {
    background: rgba(239, 68, 68, 0.1);
    color: #b91c1c;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.president-term {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
}

.president-number-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    font-weight: 500;
}

.president-quote-box {
    position: relative;
    background: rgba(12, 35, 64, 0.04);
    border: 1px solid var(--glass-border);
    border-left: 4px solid var(--primary);
    border-radius: var(--border-radius-sm);
    padding: 16px;
    margin-top: 10px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.president-quote {
    font-style: italic;
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--text-main);
    padding: 0 10px;
}

.quote-mark {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    line-height: 1;
    color: var(--primary-glow);
    opacity: 0.4;
    position: absolute;
}

.quote-mark:first-of-type {
    top: 4px;
    left: 8px;
}

.quote-mark:last-of-type {
    bottom: -8px;
    right: 8px;
}

/* Tablet improvements */
@media (min-width: 768px) {
    .president-container {
        flex-direction: row;
        align-items: flex-start;
        gap: 26px;
    }
    
    .president-avatar {
        align-self: flex-start;
        width: 90px;
        height: 90px;
        font-size: 3.5rem;
    }
}



/* ==========================================
   8. FOOTER
   ========================================== */
.app-footer {
    border-top: 1px solid var(--glass-border);
    padding-top: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.8rem;
}

.footer-sub {
    font-size: 0.7rem;
    margin-top: 2px;
}


/* ==========================================
   9. PROGRESSIVE ENHANCEMENT (MEDIA QUERIES)
   ========================================== */

/* --- TABLETS / PORTRAIT & SMALL DESKTOPS (min-width: 768px) --- */
@media (min-width: 768px) {
    :root {
        --card-padding: 26px;
        --border-radius-lg: 20px;
        --border-radius-md: 14px;
    }

    .app-container {
        padding: 32px 24px;
        gap: 36px;
    }

    .logo-icon {
        font-size: 1.85rem;
    }

    .logo-text {
        font-size: 1.6rem;
    }

    /* Grid wraps to 2 columns */
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 26px;
    }

    .span-2 {
        grid-column: span 2;
    }

    .form-group-row {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .toggle-container {
        margin-bottom: 0px;
        height: 50px;
    }

    .pop-culture-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .history-grid {
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }

    .micro-ticking-grid {
        grid-template-columns: repeat(3, 1fr);
        padding: 16px;
    }

    .tick-number {
        font-size: 3.5rem;
    }

    .card-title {
        font-size: 1.35rem;
        padding-right: 0;
    }
}

/* --- LARGE DESKTOPS / ULTRA WIDE (min-width: 1024px) --- */
@media (min-width: 1024px) {
    :root {
        --card-padding: 32px;
        --border-radius-lg: 24px;
        --border-radius-md: 16px;
    }

    .app-container {
        padding: 40px 32px;
        gap: 40px;
    }

    /* Grid wraps to 3 columns */
    .results-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .span-3 {
        grid-column: span 3;
    }

    .history-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .tick-number {
        font-size: 4rem;
    }

    .card-title {
        font-size: 1.5rem;
    }
}

/* --- KEYFRAME ANIMATIONS --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulseGlow {
    0% {
        box-shadow: 0 0 3px var(--accent);
        opacity: 0.8;
    }
    50% {
        box-shadow: 0 0 10px var(--accent);
        opacity: 1;
    }
    100% {
        box-shadow: 0 0 3px var(--accent);
        opacity: 0.8;
    }
}

@keyframes rotateHourglass {
    0% { transform: rotate(0deg); }
    40% { transform: rotate(180deg); }
    50% { transform: rotate(180deg); }
    90% { transform: rotate(360deg); }
    100% { transform: rotate(360deg); }
}