/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

:root {
    /* M3 Metro Colors - Red theme */
    --metro-red: #E03C31;
    --metro-red-dark: #B82E25;
    --metro-red-light: #F05A50;

    /* Grays */
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;

    /* Semantic Colors */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --bg-primary: #FFFFFF;
    --bg-secondary: var(--gray-50);
    --border-color: var(--gray-200);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;

    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-secondary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Container
   ======================================== */

.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--spacing-md);
}

/* ========================================
   Header
   ======================================== */

.header {
    background: linear-gradient(135deg, var(--metro-red) 0%, var(--metro-red-dark) 100%);
    color: white;
    padding-block: var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

.header__title {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.header__metro {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3.5rem;
    height: 3.5rem;
    background-color: white;
    color: var(--metro-red);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    font-weight: 900;
    box-shadow: var(--shadow-md);
}

.header__subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.95;
    font-weight: 300;
}

/* ========================================
   Language Toggle
   ======================================== */

.lang-toggle {
    position: absolute;
    top: var(--spacing-md);
    right: var(--spacing-md);
    display: flex;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.15);
    padding: 4px;
    border-radius: var(--border-radius);
}

.lang-toggle__btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.5rem;
    padding: 4px 8px;
    border-radius: 4px;
    transition: all var(--transition-fast);
    opacity: 0.6;
    line-height: 1;
}

.lang-toggle__btn:hover {
    opacity: 1;
    background: rgba(255, 255, 255, 0.2);
}

.lang-toggle__btn.active {
    opacity: 1;
    background: rgba(255, 255, 255, 0.3);
}

.header {
    position: relative;
}

/* ========================================
   Main Content
   ======================================== */

.main {
    padding-block: var(--spacing-sm);
}

/* ========================================
   Intro Section
   ======================================== */

.intro {
    background-color: var(--bg-primary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius-lg);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
}

.intro__text {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    text-align: center;
    max-width: 800px;
    margin-inline: auto;
}

/* ========================================
   Ring Container & SVG
   ======================================== */

.ring-container {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    box-shadow: var(--shadow-md);
}

.ring-svg {
    width: 100%;
    max-width: 650px;
    height: auto;
    margin-inline: auto;
    display: block;
}

.ring-line {
    fill: none;
    stroke: var(--metro-red);
    stroke-width: 8;
    stroke-linecap: round;
}

.station {
    cursor: pointer;
}

.station__marker {
    fill: white;
    stroke: var(--metro-red);
    stroke-width: 4;
    transition: fill var(--transition-fast);
}

.station:hover .station__marker,
.station:focus .station__marker {
    fill: var(--metro-red-light);
}

/* Interchange stations (S-train connections) */
.station--interchange .station__marker {
    stroke-width: 3;
}

/* Transport icons */
.station__icons {
    pointer-events: none;
}

.station__icon {
    font-size: 10px;
    font-weight: 700;
    fill: white;
    text-anchor: middle;
    dominant-baseline: central;
}

.station__icon-bg {
    stroke: white;
    stroke-width: 1;
}

.station__icon-bg--s-train {
    fill: #E03C31;
}

.station__icon-bg--regional {
    fill: #4A4A4A;
}

.station__icon-bg--m1 {
    fill: #009E49;
}

.station__icon-bg--m2 {
    fill: #FFC20E;
}

.station__icon--m2 {
    fill: #000;
}

.station__label {
    font-size: 14px;
    font-weight: 600;
    fill: var(--text-primary);
    text-anchor: middle;
    pointer-events: none;
    user-select: none;
    text-shadow:
        -1px -1px 0 white,
        1px -1px 0 white,
        -1px 1px 0 white,
        1px 1px 0 white,
        0 0 4px white;
}

/* ========================================
   Popup Tooltip
   ======================================== */

.popup {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.9);
    background-color: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-lg);
    max-width: 400px;
    width: calc(100% - var(--spacing-lg) * 2);
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.popup.active {
    opacity: 1;
    pointer-events: auto;
    transform: translate(-50%, -50%) scale(1);
}

.popup::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--metro-red) 0%, var(--metro-red-light) 100%);
    border-radius: var(--border-radius-lg) var(--border-radius-lg) 0 0;
}

.popup__close {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    line-height: 1;
    color: var(--gray-600);
    cursor: pointer;
    padding: var(--spacing-xs);
    width: 2rem;
    height: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
}

.popup__close:hover {
    background-color: var(--gray-100);
    color: var(--gray-900);
}

.popup__station-name {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--metro-red);
    margin-bottom: var(--spacing-md);
    padding-right: var(--spacing-lg);
}

.popup__content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.popup__pub-name {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--text-primary);
}

.popup__distance {
    font-size: var(--font-size-sm);
    color: var(--metro-red);
    font-weight: 600;
}

.popup__address {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.popup__address a,
.popup__address .popup__website a {
    color: var(--metro-red);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.popup__address a:hover {
    color: var(--metro-red-dark);
    text-decoration: underline;
}

.popup__website {
    margin-top: var(--spacing-sm);
}

.popup__description {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    line-height: 1.5;
    margin-top: var(--spacing-xs);
}

.popup__no-data {
    text-align: center;
    padding: var(--spacing-md);
}

.popup__no-data h4 {
    font-size: var(--font-size-lg);
    color: var(--metro-red);
    margin-bottom: var(--spacing-xs);
}

.popup__no-data p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.popup__contact-btn {
    display: inline-block;
    background: var(--metro-red);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-sm);
    transition: background var(--transition-fast);
}

.popup__contact-btn:hover {
    background: var(--metro-red-dark);
}

/* ========================================
   Legend Section
   ======================================== */

.legend {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.legend__title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 3px solid var(--metro-red);
}

.legend__list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: var(--spacing-sm);
}

.legend__item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    transition: background-color var(--transition-fast);
    cursor: pointer;
}

.legend__item:hover {
    background-color: var(--gray-100);
}

.legend__marker {
    width: 1.5rem;
    height: 1.5rem;
    background-color: white;
    border: 3px solid var(--metro-red);
    border-radius: 50%;
    flex-shrink: 0;
}

.legend__number {
    font-weight: 700;
    color: var(--metro-red);
    min-width: 2rem;
}

.legend__station-name {
    font-size: var(--font-size-base);
    color: var(--text-primary);
}

/* ========================================
   Info Section
   ======================================== */

.info {
    display: grid;
    gap: var(--spacing-md);
}

.info__card {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.info__card h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.info__card ul {
    list-style-position: inside;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.info__card li {
    color: var(--text-secondary);
    padding-left: var(--spacing-sm);
}

/* ========================================
   Contact Section
   ======================================== */

.contact {
    background-color: var(--bg-primary);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-sm);
}

.contact h2 {
    font-size: var(--font-size-xl);
    color: var(--metro-red);
    margin-bottom: var(--spacing-xs);
}

.contact > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.contact__row {
    display: flex;
    gap: var(--spacing-sm);
}

.contact__row > * {
    flex: 1;
}

.contact__checkbox {
    display: flex;
    align-items: center;
}

.contact__checkbox label {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    cursor: pointer;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

.contact__checkbox input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--metro-red);
}

.contact__pub-fields.hidden {
    display: none;
}

.contact__form input,
.contact__form select,
.contact__form textarea {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    transition: border-color var(--transition-fast);
}

.contact__form input:focus,
.contact__form select:focus,
.contact__form textarea:focus {
    outline: none;
    border-color: var(--metro-red);
}

.contact__form textarea {
    resize: vertical;
}

.contact__submit {
    background: var(--metro-red);
    color: white;
    border: none;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--border-radius);
    font-size: var(--font-size-base);
    font-weight: 600;
    cursor: pointer;
    transition: background var(--transition-fast);
    align-self: flex-start;
}

.contact__submit:hover {
    background: var(--metro-red-dark);
}

.contact__success {
    background: #d4edda;
    color: #155724;
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    text-align: center;
    display: none;
}

@media (max-width: 480px) {
    .contact__row {
        flex-direction: column;
    }
}

/* ========================================
   Footer
   ======================================== */

.footer {
    background-color: var(--gray-800);
    color: var(--gray-300);
    padding-block: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.footer__text {
    text-align: center;
    font-size: var(--font-size-sm);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
    .header__title {
        font-size: var(--font-size-2xl);
    }

    .header__metro {
        width: 3rem;
        height: 3rem;
        font-size: var(--font-size-xl);
    }

    .header__subtitle {
        font-size: var(--font-size-base);
    }

    .intro__text {
        font-size: var(--font-size-base);
    }

    .ring-container {
        padding: var(--spacing-md);
    }

    .station__label {
        font-size: 11px;
    }

    .popup {
        max-width: calc(100% - var(--spacing-md) * 2);
        padding: var(--spacing-md);
    }

    .popup__station-name {
        font-size: var(--font-size-lg);
    }

    .popup__pub-name {
        font-size: var(--font-size-base);
    }

    .legend__list {
        grid-template-columns: 1fr;
    }

    .legend__title {
        font-size: var(--font-size-xl);
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-xl: 2rem;
        --spacing-2xl: 2.5rem;
    }

    .header {
        padding-block: var(--spacing-lg);
    }

    .header__title {
        font-size: var(--font-size-xl);
        gap: var(--spacing-xs);
    }

    .header__metro {
        width: 2.5rem;
        height: 2.5rem;
        font-size: var(--font-size-lg);
    }

    .station__label {
        font-size: 9px;
    }

    .ring-line {
        stroke-width: 6;
    }
}

/* ========================================
   Accessibility
   ======================================== */

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

.station:focus {
    outline: none;
}

.popup__close:focus {
    outline: 2px solid var(--metro-red);
    outline-offset: 2px;
}

/* ========================================
   Print Styles
   ======================================== */

@media print {
    .popup,
    .footer {
        display: none;
    }

    body {
        background-color: white;
    }

    .ring-container,
    .legend,
    .info__card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}