/* ==================== Vintage/Retro Design ==================== */

/* Animatable sky color properties */
@property --sky-top {
    syntax: '<color>';
    initial-value: #0a0a1a;
    inherits: false;
}
@property --sky-mid {
    syntax: '<color>';
    initial-value: #1a1a2e;
    inherits: false;
}
@property --sky-bottom {
    syntax: '<color>';
    initial-value: #1a1a2e;
    inherits: false;
}

:root {
    --primary-color: #5c4033;
    --secondary-color: #c41e3a;
    --accent-color: #b8860b;
    --light-gray: #f5f1e8;
    --dark-gray: #6b5b4f;
    --text-color: #3d2b1f;
    --card-bg: #fffdf8;
}

/* Subtle paper texture background */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--light-gray);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100' viewBox='0 0 100 100'%3E%3Cg fill-rule='evenodd'%3E%3Cg fill='%23d4c4a8' fill-opacity='0.15'%3E%3Cpath opacity='.5' d='M96 95h4v1h-4v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4h-9v4h-1v-4H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15v-9H0v-1h15V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h9V0h1v15h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9h4v1h-4v9zm-1 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-10 0v-9h-9v9h9zm-9-10h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9zm10 0h9v-9h-9v9z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    color: var(--text-color);
}

/* ==================== Header ==================== */
header {
    background: #1a1a2e;
    color: #f5f1e8;
    text-align: center;
    padding: 2rem 1rem 0;
    position: relative;
    border-bottom: 4px solid var(--accent-color);
    overflow: hidden;
}

/* ==================== Day-Night Cycle ==================== */
.sky {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: linear-gradient(to bottom, var(--sky-top), var(--sky-mid), var(--sky-bottom));
    animation: sky-cycle 60s ease-in-out infinite;
    animation-delay: -15s;
}

@keyframes sky-cycle {
    0%, 100% { --sky-top: #0a0a1a; --sky-mid: #1a1a2e; --sky-bottom: #1a1a2e; }
    5%       { --sky-top: #0f0f24; --sky-mid: #1f1535; --sky-bottom: #2a1a3a; }
    10%      { --sky-top: #1a1a2e; --sky-mid: #c06848; --sky-bottom: #e8a060; }
    14%      { --sky-top: #4a3080; --sky-mid: #d06050; --sky-bottom: #ffd060; }
    18%      { --sky-top: #3a70b0; --sky-mid: #6aace0; --sky-bottom: #a0d0e8; }
    25%      { --sky-top: #2e6bba; --sky-mid: #5da1e0; --sky-bottom: #87ceeb; }
    50%      { --sky-top: #2e6bba; --sky-mid: #5da1e0; --sky-bottom: #87ceeb; }
    58%      { --sky-top: #3a70b0; --sky-mid: #6aace0; --sky-bottom: #a0d0e8; }
    66%      { --sky-top: #5a4090; --sky-mid: #c06050; --sky-bottom: #f0a060; }
    72%      { --sky-top: #2d1b4e; --sky-mid: #a03050; --sky-bottom: #e89050; }
    80%      { --sky-top: #1a1a2e; --sky-mid: #2d1b4e; --sky-bottom: #3d2050; }
    90%      { --sky-top: #0a0a1a; --sky-mid: #1a1a2e; --sky-bottom: #1a1a2e; }
}

/* Sun */
.sun {
    position: absolute;
    width: 36px;
    height: 36px;
    background: radial-gradient(circle, #fff6a0 0%, #ffd700 40%, #ff8c00 100%);
    border-radius: 50%;
    box-shadow: 0 0 20px 8px rgba(255, 200, 50, 0.5), 0 0 60px 20px rgba(255, 150, 0, 0.2);
    z-index: 1;
    animation: sun-path 60s linear infinite;
    animation-delay: -15s;
    pointer-events: none;
}

@keyframes sun-path {
    0%   { left: 5%;  top: 105%; opacity: 0; }
    8%   { left: 10%; top: 90%;  opacity: 0.4; }
    12%  { left: 15%; top: 50%;  opacity: 0.8; }
    16%  { left: 20%; top: 25%;  opacity: 1; }
    25%  { left: 32%; top: 10%;  opacity: 1; }
    38%  { left: 48%; top: 5%;   opacity: 1; }
    50%  { left: 60%; top: 10%;  opacity: 1; }
    60%  { left: 72%; top: 25%;  opacity: 1; }
    66%  { left: 80%; top: 50%;  opacity: 0.8; }
    72%  { left: 87%; top: 85%;  opacity: 0.4; }
    78%  { left: 92%; top: 105%; opacity: 0; }
    100% { left: 5%;  top: 105%; opacity: 0; }
}

/* Moon */
.moon {
    position: absolute;
    width: 28px;
    height: 28px;
    background: radial-gradient(circle at 35% 40%, transparent 40%, #e8e8d0 42%, #f5f5e0 100%);
    border-radius: 50%;
    box-shadow: 0 0 12px 4px rgba(200, 200, 180, 0.3), 0 0 40px 10px rgba(200, 200, 180, 0.1);
    z-index: 1;
    animation: moon-path 60s linear infinite;
    animation-delay: -15s;
    pointer-events: none;
}

@keyframes moon-path {
    0%   { left: 40%; top: 10%;  opacity: 0.9; }
    3%   { left: 50%; top: 15%;  opacity: 0.8; }
    6%   { left: 60%; top: 30%;  opacity: 0.5; }
    10%  { left: 70%; top: 60%;  opacity: 0.2; }
    13%  { left: 78%; top: 105%; opacity: 0; }
    18%  { left: 85%; top: 110%; opacity: 0; }
    72%  { left: 5%;  top: 110%; opacity: 0; }
    78%  { left: 10%; top: 80%;  opacity: 0.2; }
    82%  { left: 18%; top: 50%;  opacity: 0.5; }
    86%  { left: 24%; top: 25%;  opacity: 0.7; }
    92%  { left: 32%; top: 10%;  opacity: 0.9; }
    100% { left: 40%; top: 10%;  opacity: 0.9; }
}

/* Night overlay - blue filter */
@property --night-opacity {
    syntax: '<number>';
    initial-value: 0;
    inherits: false;
}

.night-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at 50% 50%, rgba(10, 15, 40, 0.6) 0%, rgba(5, 8, 25, 0.8) 100%);
    z-index: 3;
    pointer-events: none;
    opacity: var(--night-opacity);
    animation: night-filter 60s ease-in-out infinite;
    animation-delay: -15s;
    mix-blend-mode: multiply;
}

@keyframes night-filter {
    0%   { --night-opacity: 0.7; }
    5%   { --night-opacity: 0.5; }
    10%  { --night-opacity: 0.3; }
    15%  { --night-opacity: 0.1; }
    20%  { --night-opacity: 0; }
    55%  { --night-opacity: 0; }
    65%  { --night-opacity: 0.1; }
    72%  { --night-opacity: 0.3; }
    80%  { --night-opacity: 0.5; }
    90%  { --night-opacity: 0.7; }
    100% { --night-opacity: 0.7; }
}

/* Train lights */
.headlight {
    position: absolute;
    width: 8px;
    height: 6px;
    background: radial-gradient(ellipse, #fffde0 0%, #ffd700 60%, transparent 100%);
    border-radius: 50%;
    top: var(--headlight-top, 18px);
    right: var(--headlight-right, -2px);
    box-shadow: 0 0 8px 4px rgba(255, 253, 200, 0.6);
    z-index: 20;
    animation: light-glow 60s ease-in-out infinite;
    animation-delay: -15s;
}

/* Cone-shaped light beam extending from headlight */
.headlight::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: calc(var(--cone-spread, 25px) * 3);
    height: calc(var(--cone-spread, 25px) * 3);
    transform: translateY(-50%);
    background: linear-gradient(to right,
        rgba(255, 240, 150, var(--cone-opacity, 0.3)),
        rgba(255, 240, 150, 0) 80%);
    clip-path: polygon(0% 45%, 100% 5%, 100% 95%, 0% 55%);
    pointer-events: none;
    filter: blur(2px);
}

.headlight-2 {
    top: var(--headlight2-top, 28px);
    right: var(--headlight2-right, 3px);
}

.wagon-wrapper {
    position: relative;
    display: inline-block;
    margin-right: var(--wagon-spacing, 2px);
}

.wagon-light {
    position: absolute;
    width: 3px;
    height: 3px;
    background: #fffde0;
    border-radius: 50%;
    box-shadow: 0 0 6px 3px rgba(255, 253, 200, 0.5), 0 0 15px 6px rgba(255, 240, 150, 0.2);
    top: var(--wagon-light-top, 10px);
    left: var(--wagon-light-left, 20px);
    z-index: 20;
    animation: light-glow 60s ease-in-out infinite;
    animation-delay: -15s;
}

/* Wagon window SVG overlay */
.wagon-windows-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20;
    pointer-events: none;
    overflow: visible;
    transform: translate(var(--window-mask-x, 0px), var(--window-mask-y, 0px)) scale(var(--window-mask-scale, 1));
    transform-origin: center;
}

.window-pane {
    fill: rgba(255, 245, 180, 0.85);
    animation: light-glow 60s ease-in-out infinite;
    animation-delay: -15s;
}

/* Random window flicker - applied via JS (group-based) */
.window-group.off .window-pane { fill: rgba(50, 50, 80, 0.3); }
.window-group.dim .window-pane { fill: rgba(255, 245, 180, 0.4); }

/* Locomotive fire/boiler window */
.loco-fire-svg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 20;
    pointer-events: none;
    overflow: visible;
    transform: translate(var(--fire-mask-x, 0px), var(--fire-mask-y, 0px)) scale(var(--fire-mask-scale, 1));
    transform-origin: center;
}

.fire-pane {
    animation: fire-flicker 0.8s ease-in-out infinite alternate, light-glow 60s ease-in-out infinite;
    animation-delay: 0s, -15s;
}

@keyframes fire-flicker {
    0%   { fill: rgba(255, 80, 10, 0.9); }
    25%  { fill: rgba(255, 170, 40, 0.95); }
    50%  { fill: rgba(255, 50, 5, 0.8); }
    75%  { fill: rgba(255, 200, 60, 0.92); }
    100% { fill: rgba(255, 100, 15, 0.85); }
}

/* Tail light - red rear light on last wagon */
.wagon-light.tail-light {
    background: #ff2020;
    box-shadow: 0 0 6px 3px rgba(255, 32, 32, 0.6), 0 0 15px 6px rgba(255, 32, 32, 0.25);
}

@keyframes light-glow {
    0%   { opacity: 0.9; }
    5%   { opacity: 0.7; }
    10%  { opacity: 0.4; }
    15%  { opacity: 0.1; }
    20%  { opacity: 0; }
    55%  { opacity: 0; }
    65%  { opacity: 0.1; }
    72%  { opacity: 0.4; }
    80%  { opacity: 0.7; }
    90%  { opacity: 0.9; }
    100% { opacity: 0.9; }
}

/* Bushes below tracks - partially covering the train */
.bushes {
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 30px;
    z-index: 15;
    pointer-events: none;
}

.bush {
    position: absolute;
    bottom: 0;
    pointer-events: auto;
    cursor: pointer;
}

.bush.has-squirrel {
    /* cursor set via JS with nut icon */
}

/* Squirrel sprite animation */
.squirrel {
    position: absolute;
    width: 32px;
    height: 32px;
    background: url('squirrel.png') 0 -64px;
    image-rendering: pixelated;
    animation: squirrel-run 0.5s steps(8) infinite;
    z-index: 20;
    pointer-events: none;
    bottom: 15px;
}

.squirrel.face-left {
    transform: scaleX(-1);
}

@keyframes squirrel-run {
    0%   { background-position: 0 -64px; }
    100% { background-position: -256px -64px; }
}

/* Grass below tracks */
.grass {
    position: relative;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    height: 30px;
    background: linear-gradient(to bottom, #5a9c4a 0%, #4a8c3f 30%, #3d7a35 60%, #357030 100%);
    z-index: 1;
    border-top: 3px solid #6aaa55;
}

h1 {
    margin: 1.5rem 0 0 0;
    font-family: Georgia, 'Times New Roman', serif;
    font-weight: normal;
    font-size: 2.2rem;
    letter-spacing: 0.05em;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    background: rgba(92, 64, 51, 0.7);
    padding: 0.5rem 1.5rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: inline-block;
    position: relative;
    z-index: 3;
}

h2 {
    margin-top: 0;
    text-align: center;
    color: var(--primary-color);
    font-family: Georgia, 'Times New Roman', serif;
    font-weight: normal;
    font-size: 1.5rem;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* ==================== Buttons ==================== */
#reset-upload-btn {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.6rem 1.2rem;
    background-color: var(--accent-color);
    color: #fff;
    border: 2px solid #8b6914;
    border-radius: 3px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s;
    text-transform: uppercase;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

#reset-upload-btn:hover {
    background-color: #d4a017;
    transform: translateY(-1px);
}

/* ==================== Upload Section ==================== */
#upload-section {
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: 4px;
    text-align: center;
    box-shadow: 0 2px 8px rgba(92, 64, 51, 0.15);
    max-width: 500px;
    margin: 0 auto;
    border: 1px solid #d4c4a8;
}

#upload-section h2 {
    margin-bottom: 0.5rem;
}

#upload-section > p {
    color: var(--dark-gray);
    margin-bottom: 1.5rem;
    font-size: 1.05rem;
}

/* Dropzone - Railway sign style */
#dropzone {
    border: 3px dashed var(--primary-color);
    border-radius: 4px;
    padding: 2.5rem 2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #faf8f3;
}

#dropzone:hover {
    border-color: var(--secondary-color);
    background: #fff9f0;
}

#dropzone.drag-over {
    border-color: var(--secondary-color);
    background: #fff5e6;
    border-style: solid;
}

#dropzone.processing {
    pointer-events: none;
    opacity: 0.7;
}

.dropzone-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.dropzone-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.dropzone-text {
    font-size: 1.1rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 0;
    font-family: Georgia, serif;
}

.dropzone-subtext {
    font-size: 0.9rem;
    color: var(--dark-gray);
    margin: 0;
}

#dropzone input[type="file"] {
    display: none;
}

#upload-status {
    margin-top: 1.5rem;
    font-weight: bold;
    min-height: 1.2em;
    color: var(--secondary-color);
}

#upload-status.error {
    color: #a62c2c;
}

/* Privacy note */
.privacy-note {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0.75rem 1rem;
    background: #f0ebe0;
    border-radius: 4px;
    font-size: 0.85rem;
    color: #5c4033;
    border-left: 3px solid var(--accent-color);
}

/* ==================== Controls ==================== */
.controls {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(92, 64, 51, 0.15);
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 2rem;
    border: 1px solid #d4c4a8;
}

fieldset {
    border: 1px solid #c4b49a;
    border-radius: 4px;
    padding: 1rem;
    margin: 0;
    min-width: 200px;
    flex-grow: 1;
    background: #fdfcf9;
}

legend {
    font-weight: bold;
    padding: 0 0.75rem;
    color: var(--primary-color);
    font-family: Georgia, serif;
    font-size: 1rem;
}

.setting {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.setting:last-child {
    margin-bottom: 0;
}

.setting label {
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--dark-gray);
}

.setting input[type="range"] {
    width: 100%;
    accent-color: var(--secondary-color);
}

.setting select,
.setting input[type="color"],
#generate-btn {
    padding: 0.5rem;
    border-radius: 3px;
    border: 1px solid #c4b49a;
    font-size: 1rem;
    background: #fff;
}

.setting input[type="color"] {
    height: 40px;
    padding: 0.2rem;
    min-width: 50px;
}

#generate-btn {
    background: var(--secondary-color);
    color: white;
    border: 2px solid #a01830;
    cursor: pointer;
    font-weight: bold;
    align-self: flex-end;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0.6rem 1.5rem;
}

#generate-btn:hover {
    background: #d62245;
}

#generate-btn:disabled {
    background-color: var(--dark-gray);
    border-color: #5a4a3f;
    cursor: not-allowed;
}

/* ==================== Preview Section ==================== */
#preview-section {
    background-color: var(--card-bg);
    padding: 1.5rem;
    border-radius: 4px;
    box-shadow: 0 2px 8px rgba(92, 64, 51, 0.15);
    margin-bottom: 2rem;
    border: 1px solid #d4c4a8;
}

#preview-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 150px;
    background-color: #f5f1e8;
    border-radius: 4px;
    position: relative;
    padding: 1rem;
    border: 1px solid #d4c4a8;
}

#preview-canvas {
    max-width: 100%;
    max-height: 150px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

.info-hint {
    color: var(--dark-gray);
    font-size: 0.9rem;
    font-style: italic;
    margin-top: 0.5rem;
}

#preview-loader {
    position: absolute;
    font-weight: bold;
    color: var(--dark-gray);
}

/* ==================== Selection Controls ==================== */
.selection-controls {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.selection-controls button {
    padding: 0.5rem 1rem;
    border: 2px solid var(--primary-color);
    background-color: var(--card-bg);
    color: var(--primary-color);
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s;
    font-weight: 500;
}

.selection-controls button:hover {
    background-color: var(--primary-color);
    color: var(--card-bg);
}

/* ==================== Lok Cards ==================== */
.grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.lok-card {
    background-color: var(--card-bg);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 2px 6px rgba(92, 64, 51, 0.15);
    cursor: pointer;
    position: relative;
    transition: transform 0.2s, box-shadow 0.2s;
    display: flex;
    flex-direction: column;
    border: 1px solid #d4c4a8;
}

.lok-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(92, 64, 51, 0.2);
}

.lok-card input[type="checkbox"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    cursor: pointer;
    opacity: 0;
}

.lok-card input[type="checkbox"]:checked ~ img {
    outline: 4px solid var(--secondary-color);
    outline-offset: -4px;
}

.lok-card img {
    width: 100%;
    height: 140px;
    object-fit: cover;
    display: block;
}

.lok-card .info {
    padding: 0.75rem;
    flex-grow: 1;
    border-top: 1px solid #d4c4a8;
    background: linear-gradient(to bottom, #fdfcf9, #f8f5ef);
}

.lok-card .info .name {
    font-weight: bold;
    color: var(--primary-color);
    font-size: 1rem;
    margin: 0 0 0.5rem 0;
    font-family: Georgia, serif;
}

.lok-card .info .address {
    font-weight: normal;
    color: var(--dark-gray);
    font-size: 0.9rem;
    margin: 0;
}

/* Printed lok styling */
.lok-card.printed {
    opacity: 0.7;
}

.lok-card.printed:hover {
    opacity: 1;
}

.lok-card.printed img {
    filter: sepia(20%);
}

.lok-card.printed:hover img {
    filter: none;
}

.printed-badge {
    display: inline-block;
    background-color: #5a7a52;
    color: white;
    font-size: 0.7rem;
    padding: 0.15rem 0.4rem;
    border-radius: 2px;
    margin-left: 0.3rem;
    vertical-align: middle;
}

/* ==================== Loading Screen ==================== */
#loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #5c4033 0%, #3d2b1f 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    transition: opacity 0.5s ease-out;
}

#loading-screen.fade-out {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: #f5f1e8;
}

.loading-text {
    margin-top: 2rem;
    font-size: 1.2rem;
    font-family: Georgia, serif;
    animation: pulse 1.5s ease-in-out infinite;
}

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

.icons8-link {
    display: block;
    margin-top: 2rem;
    font-size: 0.75rem;
    color: rgba(245,241,232,0.5);
    text-decoration: none;
}

.icons8-link:hover {
    color: rgba(245,241,232,0.8);
}

.header-icons8 {
    position: absolute;
    bottom: 5px;
    right: 10px;
    margin: 0;
}

/* Language Switcher */
.lang-switcher {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 0.3rem;
    background: rgba(92, 64, 51, 0.7);
    padding: 0.4rem 0.5rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    z-index: 3;
}

.lang-btn {
    padding: 0.2rem 0.4rem;
    border: 2px solid transparent;
    background: transparent;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1.3rem;
    line-height: 1;
    transition: all 0.2s;
    opacity: 0.5;
}

.lang-btn:hover {
    opacity: 0.8;
}

.lang-btn.active {
    opacity: 1;
    border-color: var(--accent-color);
    background: rgba(255,255,255,0.1);
}

/* ==================== Mountain Landscape ==================== */
.mountains {
    position: absolute;
    bottom: 30px; /* above grass */
    left: 0;
    width: 100%;
    z-index: 1;
    pointer-events: none;
}

.mountain-layer {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    display: block;
}

/* ==================== Cloud Animation ==================== */
.clouds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 50%;
    overflow: hidden;
    pointer-events: none;
    z-index: 1;
}

#loading-screen .clouds {
    height: 40%;
}

header .clouds {
    height: 100%;
    z-index: 2;
}

.cloud {
    position: absolute;
    border-radius: 50%;
    filter: blur(2px);
    opacity: 0.7;
    animation: cloud-drift linear infinite;
}

@keyframes cloud-drift {
    0% {
        transform: translateX(0);
    }
    100% {
        transform: translateX(calc(-100vw - 400px));
    }
}

/* ==================== Bird Animation ==================== */
.birds {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 70%;
    overflow: hidden;
    pointer-events: none;
    z-index: 2;
}

.bird {
    position: absolute;
    width: 16px;
    height: 16px;
    background: url('BirdSprite.png') 0 -16px;
    image-rendering: pixelated;
    animation: bird-flap 0.6s steps(9) infinite, bird-fly-rtl linear infinite;
    transition: top 0.3s ease-out;
}

@keyframes bird-flap {
    0%   { background-position: 0 -16px; }
    100% { background-position: -144px -16px; }
}

@keyframes bird-fly-rtl {
    0%   { translate: 0; }
    100% { translate: calc(-100vw - 200px); }
}

@keyframes bird-fly-ltr {
    0%   { translate: 0; }
    100% { translate: calc(100vw + 200px); }
}

/* ==================== Track Animation ==================== */
.track {
    position: relative;
    width: 300px;
    height: 80px;
    margin: 0 auto;
    overflow: hidden;
}

.train {
    position: absolute;
    bottom: 1px;
    display: flex;
    align-items: flex-end;
    animation: drive 3.5s linear infinite;
    filter: drop-shadow(2px 2px 4px rgba(0,0,0,0.3));
    z-index: 10;
}

.locomotive {
    height: 55px;
    width: auto;
}

.wagon {
    height: 48px;
    width: auto;
    margin-right: 2px;
}

.locomotive-container {
    position: relative;
    top: 3px;
}

.smoke-container {
    position: absolute;
    left: 41px;
    top: 11px;
    width: 10px;
    height: 10px;
}

.smoke-puff {
    position: absolute;
    width: 8px;
    height: 8px;
    background: radial-gradient(circle, rgba(200,200,200,0.9) 0%, rgba(150,150,150,0.4) 50%, transparent 70%);
    border-radius: 50%;
    animation: smoke-rise 1.2s ease-out infinite;
}

.smoke-puff:nth-child(2) {
    animation-delay: 0.4s;
}

.smoke-puff:nth-child(3) {
    animation-delay: 0.8s;
}

@keyframes smoke-rise {
    0% {
        opacity: 0.8;
        transform: translateY(0) scale(0.5);
    }
    50% {
        opacity: 0.5;
    }
    100% {
        opacity: 0;
        transform: translateY(-25px) translateX(-15px) scale(2);
    }
}

.trees {
    position: absolute;
    bottom: 9px;
    left: 0;
    right: 0;
    z-index: 2;
}

.tree {
    position: absolute;
    height: 45px;
    width: auto;
    bottom: 0;
}

@keyframes drive {
    0% { left: -180px; }
    100% { left: 320px; }
}

.track-line {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 12px;
    z-index: 1;
    background: repeating-linear-gradient(
        90deg,
        #6b4423 0px,
        #6b4423 8px,
        transparent 8px,
        transparent 12px
    );
}

.track-line::before,
.track-line::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(to bottom, #8b8b7a 0%, #6b6b5a 50%, #4b4b3a 100%);
    border-radius: 1px;
}

.track-line::before {
    top: 1px;
}

.track-line::after {
    bottom: 1px;
}

/* Header Track - Full Width */
.header-track {
    position: relative;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    height: 80px;
    margin-top: 1.5rem;
    overflow: hidden;
    z-index: 2;
}

.header-track .train {
    animation: drive-header var(--header-train-duration, 12s) linear infinite;
}

@keyframes drive-header {
    0% { left: -180px; }
    100% { left: calc(100% + 20px); }
}

.hidden { display: none !important; }