:root {
    --color-bg: #1a0f0a;
    --color-bg-light: #2d1810;
    --color-amber: #f5a623;
    --color-amber-light: #ffc857;
    --color-amber-dark: #c7841a;
    --color-cream: #fff8e7;
    --color-foam: #fffef5;
    --color-text: #fff8e7;
    --color-text-muted: #a89080;
    
    --font-display: 'Playfair Display', Georgia, serif;
    --font-body: 'DM Sans', system-ui, sans-serif;
    
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html, body {
    height: 100%;
}

body {
    font-family: var(--font-body);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Grain overlay */
.grain {
    position: fixed;
    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='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    opacity: 0.03;
    pointer-events: none;
    z-index: 1000;
}

/* Background gradient */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background: 
        radial-gradient(ellipse 80% 50% at 50% 0%, rgba(245, 166, 35, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 100% 100%, rgba(199, 132, 26, 0.1) 0%, transparent 40%),
        radial-gradient(ellipse 50% 50% at 0% 80%, rgba(245, 166, 35, 0.08) 0%, transparent 40%);
    pointer-events: none;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    position: relative;
}

.state {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all 0.6s var(--ease-out-expo);
}

.state.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.content {
    text-align: center;
    max-width: 400px;
    width: 100%;
}

/* Typography */
h1 {
    font-family: var(--font-display);
    font-size: clamp(3.5rem, 15vw, 6rem);
    font-weight: 900;
    line-height: 0.95;
    letter-spacing: -0.02em;
    background: linear-gradient(135deg, var(--color-cream) 0%, var(--color-amber-light) 50%, var(--color-amber) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s var(--ease-out-expo) both;
}

h2 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 8vw, 3rem);
    font-weight: 700;
    color: var(--color-cream);
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.125rem;
    color: var(--color-text-muted);
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.1s both;
}

/* Buttons */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--color-amber) 0%, var(--color-amber-dark) 100%);
    color: var(--color-bg);
    font-family: var(--font-body);
    font-size: 1.125rem;
    font-weight: 600;
    padding: 1.25rem 2.5rem;
    border: none;
    border-radius: 100px;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s var(--ease-out-expo);
    box-shadow: 
        0 4px 20px rgba(245, 166, 35, 0.3),
        0 0 0 0 rgba(245, 166, 35, 0.4);
    animation: fadeInUp 0.8s var(--ease-out-expo) 0.2s both;
}

.btn-primary:hover {
    transform: translateY(-2px) scale(1.02);
    box-shadow: 
        0 8px 30px rgba(245, 166, 35, 0.4),
        0 0 0 4px rgba(245, 166, 35, 0.15);
}

.btn-primary:active {
    transform: translateY(0) scale(0.98);
}

.btn-icon {
    font-size: 1.25rem;
    transition: transform 0.3s var(--ease-out-expo);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

.btn-secondary {
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-family: var(--font-body);
    font-size: 0.875rem;
    padding: 1rem 2rem;
    cursor: pointer;
    margin-top: 1rem;
    transition: color 0.3s;
}

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

.btn-go {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 4px 20px rgba(245, 166, 35, 0.3), 0 0 0 0 rgba(245, 166, 35, 0.4); }
    50% { box-shadow: 0 4px 30px rgba(245, 166, 35, 0.5), 0 0 0 8px rgba(245, 166, 35, 0); }
}

/* Loading Animation */
.loader {
    margin-bottom: 2rem;
}

.pint {
    display: inline-block;
    animation: float 2s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.glass {
    width: 60px;
    height: 90px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.15) 0%, rgba(255, 255, 255, 0.05) 100%);
    border-radius: 5px 5px 10px 10px;
    position: relative;
    overflow: hidden;
    border: 2px solid rgba(255, 255, 255, 0.1);
}

.beer {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 70%;
    background: linear-gradient(180deg, var(--color-amber-light) 0%, var(--color-amber) 100%);
    animation: fillUp 1.5s var(--ease-out-expo) infinite;
}

@keyframes fillUp {
    0% { height: 20%; }
    50% { height: 75%; }
    100% { height: 20%; }
}

.foam {
    position: absolute;
    bottom: 70%;
    left: 0;
    right: 0;
    height: 15px;
    background: var(--color-foam);
    border-radius: 50% 50% 0 0;
    animation: foamMove 1.5s var(--ease-out-expo) infinite;
}

@keyframes foamMove {
    0% { bottom: 20%; height: 8px; }
    50% { bottom: 75%; height: 15px; }
    100% { bottom: 20%; height: 8px; }
}

.loading-text {
    color: var(--color-text-muted);
    font-size: 1rem;
    animation: fadeInOut 1.5s ease-in-out infinite;
}

@keyframes fadeInOut {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

/* Result State */
.result-badge {
    display: inline-block;
    background: rgba(245, 166, 35, 0.15);
    color: var(--color-amber);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    padding: 0.5rem 1rem;
    border-radius: 100px;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(245, 166, 35, 0.3);
}

.distance-wrapper {
    display: flex;
    align-items: baseline;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
}

.distance {
    font-family: var(--font-display);
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--color-amber-light) 0%, var(--color-amber) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.distance-unit {
    color: var(--color-text-muted);
    font-size: 1.125rem;
}

/* Error State */
.error-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    animation: shake 0.5s ease-in-out;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

#state-error h2 {
    margin-bottom: 1rem;
}

#error-message {
    color: var(--color-text-muted);
    margin-bottom: 2rem;
    line-height: 1.7;
    font-size: 0.95rem;
    max-width: 320px;
    margin-left: auto;
    margin-right: auto;
}

#error-message strong {
    color: var(--color-cream);
}

/* Footer */
footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    position: relative;
    z-index: 1;
}

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

/* Mobile optimizations */
@media (max-width: 480px) {
    .btn-primary {
        width: 100%;
        justify-content: center;
    }
    
    .content {
        padding: 0 1rem;
    }
}

/* Install Button */
.btn-install {
    display: block;
    background: transparent;
    border: 1px solid rgba(245, 166, 35, 0.3);
    color: var(--color-amber);
    font-family: var(--font-body);
    font-size: 0.8rem;
    padding: 0.6rem 1.2rem;
    border-radius: 100px;
    cursor: pointer;
    margin: 1.5rem auto 0;
    transition: all 0.3s var(--ease-out-expo);
    position: relative;
    z-index: 100;
}

.btn-install:hover {
    background: rgba(245, 166, 35, 0.1);
    border-color: var(--color-amber);
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.5rem;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s var(--ease-out-expo);
    z-index: 2000;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--color-bg-light);
    border-radius: 20px;
    padding: 2rem;
    max-width: 340px;
    width: 100%;
    position: relative;
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s var(--ease-out-expo);
    border: 1px solid rgba(245, 166, 35, 0.2);
}

.modal.active .modal-content {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: transparent;
    border: none;
    color: var(--color-text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.5rem;
    line-height: 1;
    transition: color 0.2s;
}

.modal-close:hover {
    color: var(--color-cream);
}

.modal h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    color: var(--color-cream);
    margin-bottom: 1.5rem;
    text-align: center;
}

#install-instructions {
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

#install-instructions ol {
    list-style: none;
    counter-reset: steps;
    padding: 0;
}

#install-instructions li {
    counter-increment: steps;
    margin-bottom: 0.75rem;
    padding-left: 2rem;
    position: relative;
}

#install-instructions li::before {
    content: counter(steps);
    position: absolute;
    left: 0;
    top: 0;
    width: 1.4rem;
    height: 1.4rem;
    background: rgba(245, 166, 35, 0.2);
    color: var(--color-amber);
    border-radius: 50%;
    font-size: 0.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    justify-content: center;
}

#install-instructions .icon {
    display: inline-block;
    background: rgba(245, 166, 35, 0.15);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    font-size: 1rem;
    vertical-align: middle;
    margin: 0 0.15rem;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}