/* ============================================
   WT Energiespeicher - Main Stylesheet
   Based on Design Kit 5.0 Beta
   ============================================ */

/* CSS Custom Properties */
:root {
    /* Colors from Styleguide */
    --color-background: #f2f1f3;
    --color-text: #1f2020;
    --color-accent-primary: #043e60;
    --color-accent-light: #007bc1;
    --color-accent-secondary: #f08048;

    /* Typography */
    --font-family: 'Be Vietnam Pro', sans-serif;

    /* Spacing (based on Design Kit) */
    --spacing-2: 0.125rem;
    --spacing-4: 0.25rem;
    --spacing-8: 0.5rem;
    --spacing-12: 0.75rem;
    --spacing-16: 1rem;
    --spacing-20: 1.25rem;
    --spacing-24: 1.5rem;
    --spacing-32: 2rem;
    --spacing-40: 2.5rem;
    --spacing-48: 3rem;
    --spacing-64: 4rem;
    --spacing-80: 5rem;

    /* Container */
    --container-max-width: 1280px;
    --container-padding: var(--spacing-24);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* ============================================
   Splashscreen
   ============================================ */
.splashscreen {
    position: fixed;
    inset: 0;
    background-color: var(--color-background);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 1;
    transition: opacity 0.3s ease-out;
}

.splashscreen.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.splashscreen__content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-24);
}

.splashscreen__logo {
    height: 50px;
    width: auto;
}

.splashscreen__loader {
    width: 32px;
    height: 32px;
    border: 3px solid rgba(0, 123, 193, 0.2);
    border-top-color: var(--color-accent-light);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Reset & Base Styles */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    scrollbar-gutter: stable;
}

body {
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-background);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

p, span, a, strong, b, li, button, .btn {
    font-size: clamp(0.8rem, 2vw, 1.1rem);
    line-height: 1.8;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.9;
    margin-block-end: var(--spacing-16);
}

h1 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
}

h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h3 {
    font-size: clamp(1.125rem, 2.5vw, 1.25rem);
}

p {
    margin-block-end: var(--spacing-16);
}

a {
    color: var(--color-accent-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover,
a:focus {
    color: var(--color-accent-secondary);
}

/* Container */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

/* ============================================
   Header (Based on Design Kit)
   ============================================ */
.header {
    background-color: var(--color-background);
    padding-block: var(--spacing-20);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.header__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-32);
}

.header__logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.header__logo-img {
    height: 40px;
    width: auto;
}

.header__nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-32);
}

.header__nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-24);
}

.header__nav-link {
    font-weight: 500;
    color: var(--color-text);
    padding: var(--spacing-8) var(--spacing-4);
    position: relative;
    transition: color var(--transition-fast);
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-secondary);
    transition: width var(--transition-normal);
}

.header__nav-link:hover,
.header__nav-link:focus {
    color: var(--color-accent-light);
}

.header__nav-link:hover::after,
.header__nav-link:focus::after {
    width: 100%;
}

/* Header Actions (Language Switcher + Contact Button) */
.header__actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-16);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    border: 2px solid var(--color-accent-light);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.lang-switcher__btn {
    background: none;
    border: none;
    padding: var(--spacing-8) var(--spacing-12);
    font-family: var(--font-family);
    font-weight: 500;
    color: var(--color-text);
    cursor: pointer;
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.lang-switcher__btn:hover,
.lang-switcher__btn:focus {
    background-color: var(--color-accent-light);
    color: var(--color-background);
}

.lang-switcher__btn.active {
    background-color: var(--color-accent-light);
    color: var(--color-background);
}

/* Contact Button */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-12) var(--spacing-24);
    font-family: var(--font-family);
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}

.btn--primary {
    background-color: var(--color-accent-secondary);
    color: white;
}

.btn--primary:hover,
.btn--primary:focus {
    background-color: #c05830;
    color: white;
    transform: translateY(-3px);
}

/* Mobile Menu Toggle */
.header__menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-8);
    flex-direction: column;
    gap: 5px;
}

.header__menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text);
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* ============================================
   Main Content
   ============================================ */
.main {
    flex: 1;
    padding-block: var(--spacing-64);
}

/* Hero Section */
.hero {
    background-color: var(--color-accent-primary);
    background-image: url('../assets/signet-pattern.svg');
    background-repeat: repeat;
    background-size: 200px auto;
    background-position: center;
    min-height: 300px;
    max-height: 400px;
    display: flex;
    align-items: center;
    padding-block: var(--spacing-48);
    position: relative;
}

.hero__content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: var(--container-max-width);
    margin-inline: auto;
    padding-inline: var(--container-padding);
}

.hero__title {
    color: white;
    margin-block-end: var(--spacing-16);
    font-size: clamp(2rem, 5vw, 3rem);
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: white;
    opacity: 0.9;
    margin-block-end: 0;
}

/* Content Section */
.content-section {
    margin-block-end: var(--spacing-48);
    max-width: 800px;
}

.content-section__text {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    line-height: 1.9;
    max-width: var(--container-max-width);
}

.content-section__text a {
    font-size: inherit;
    line-height: inherit;
}

.content-section__text span {
    font-size: inherit;
    line-height: inherit;
}

/* Textmarker/Highlight Effect */
.highlight {
    background: linear-gradient(180deg, transparent 60%, rgba(240, 128, 72, 0.3) 60%);
    padding: 0 4px;
    margin: 0 -4px;
}

/* Tooltip */
.tooltip {
    position: relative;
    cursor: help;
    border-bottom: 2px dotted var(--color-accent-secondary);
}

.tooltip::before,
.tooltip::after {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-normal), visibility var(--transition-normal);
    pointer-events: none;
    z-index: 1000;
}

/* Tooltip Arrow */
.tooltip::before {
    content: '';
    bottom: 100%;
    margin-bottom: -6px;
    border: 6px solid transparent;
    border-top-color: var(--color-text);
}

/* Tooltip Content */
.tooltip::after {
    content: attr(data-tooltip);
    bottom: calc(100% + 6px);
    background-color: var(--color-text);
    color: var(--color-background);
    padding: var(--spacing-8) var(--spacing-12);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 400;
    line-height: 1.5;
    width: max-content;
    max-width: 280px;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.tooltip:hover::before,
.tooltip:hover::after,
.tooltip:focus::before,
.tooltip:focus::after {
    opacity: 1;
    visibility: visible;
}

/* Tooltip responsive - show below on mobile */
@media (max-width: 768px) {
    .tooltip::before {
        bottom: auto;
        top: 100%;
        margin-bottom: 0;
        margin-top: -6px;
        border-top-color: transparent;
        border-bottom-color: var(--color-text);
    }

    .tooltip::after {
        bottom: auto;
        top: calc(100% + 6px);
        max-width: 220px;
        font-size: 0.75rem;
    }
}

.content-section__text + .content-section__text {
    margin-block-start: var(--spacing-24);
}

.content-section__links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-16);
    margin-block-start: var(--spacing-32);
}

.content-section__link {
    font-weight: 500;
    color: var(--color-text);
    opacity: 0.7;
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-8);
    width: fit-content;
    transition: opacity 0.2s ease-in-out, color 0.2s ease-in-out;
}

.content-section__link::before {
    content: '';
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
    opacity: 0.6;
    transition: opacity 0.2s ease-in-out;
}

.content-section__link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 26px;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-light);
    transition: width 0.2s ease-in-out;
}

/* AGB Icon - Dokument mit Stift (Vertrag) */
.content-section__link--agb::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2020' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z'/%3E%3Cpolyline points='14 2 14 8 20 8'/%3E%3Cline x1='16' y1='13' x2='8' y2='13'/%3E%3Cline x1='16' y1='17' x2='8' y2='17'/%3E%3Cline x1='10' y1='9' x2='8' y2='9'/%3E%3C/svg%3E");
}

/* AEB Icon - Einkaufstasche */
.content-section__link--aeb::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2020' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 2L3 6v14a2 2 0 0 0 2 2h14a2 2 0 0 0 2-2V6l-3-4z'/%3E%3Cline x1='3' y1='6' x2='21' y2='6'/%3E%3Cpath d='M16 10a4 4 0 0 1-8 0'/%3E%3C/svg%3E");
}

/* CoC Icon - Schild mit Häkchen (Verhaltenskodex) */
.content-section__link--coc::before {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231f2020' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z'/%3E%3Cpath d='m9 12 2 2 4-4'/%3E%3C/svg%3E");
}

.content-section__link:hover,
.content-section__link:focus {
    opacity: 1;
    color: var(--color-accent-light);
}

.content-section__link:hover::before,
.content-section__link:focus::before {
    opacity: 1;
}

.content-section__link:hover::after,
.content-section__link:focus::after {
    width: calc(100% - 26px);
}

/* Impressum Page */
.impressum {
    max-width: 800px;
}

.impressum__section {
    margin-block-end: var(--spacing-32);
    padding-block-end: var(--spacing-32);
    border-block-end: 2px solid rgba(0, 123, 193, 0.2);
}

.impressum__section:last-child {
    border-block-end: none;
}

.impressum__section h2 {
    color: var(--color-accent-light);
    margin-block-end: var(--spacing-16);
}

.impressum__section p {
    margin-block-end: var(--spacing-8);
}

.impressum__section a {
    word-break: break-all;
}

.impressum__section h3 {
    font-weight: 600;
    margin-top: var(--spacing-24);
    margin-bottom: var(--spacing-8);
}

.impressum__section h4 {
    font-weight: 600;
    margin-top: var(--spacing-20);
    margin-bottom: var(--spacing-8);
}

.impressum__highlight {
    background-color: rgba(0, 123, 193, 0.06);
    border-left: 3px solid var(--color-accent-light);
    padding: var(--spacing-20) var(--spacing-24);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    margin: var(--spacing-16) 0;
}

.impressum__list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

.impressum__list li {
    position: relative;
    padding-left: var(--spacing-20);
}

.impressum__list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 6px;
    background-color: var(--color-accent-light);
    border-radius: 50%;
}

/* ============================================
   Footer (Based on Design Kit - Light Theme)
   ============================================ */
.footer {
    background-color: var(--color-background);
    border-block-start: 2px solid rgba(0, 123, 193, 0.15);
    padding-block: var(--spacing-48);
    margin-block-start: auto;
}

.footer__inner {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--spacing-48);
}

.footer__brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-20);
}

.footer__logo-img {
    height: 36px;
    width: auto;
    display: block;
}

.footer__contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-8);
}

.footer__contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-12);
    color: var(--color-accent-light);
}

.footer__contact-item svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.footer__social {
    display: flex;
    gap: var(--spacing-16);
    margin-block-start: var(--spacing-8);
}

.footer__social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    color: var(--color-accent-light);
    transition: color var(--transition-fast), background-color var(--transition-fast);
}

.footer__social-link:hover,
.footer__social-link:focus {
    color: var(--color-accent-secondary);
}

.footer__social-link svg {
    width: 20px;
    height: 20px;
}

.footer__section h3 {
    color: var(--color-text);
    margin-block-end: var(--spacing-20);
    font-weight: 600;
}

.footer__nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-12);
}

.footer__nav-list a {
    color: var(--color-text);
    opacity: 0.8;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

.footer__nav-list a:hover,
.footer__nav-list a:focus {
    opacity: 1;
    color: var(--color-accent-secondary);
}

.footer__bottom {
    margin-block-start: var(--spacing-48);
    padding-block-start: var(--spacing-24);
    border-block-start: 2px solid rgba(0, 123, 193, 0.2);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-16);
}

.footer__copyright {
    color: var(--color-text);
    opacity: 0.7;
}

.footer__legal-links {
    display: flex;
    gap: var(--spacing-24);
    list-style: none;
}

.footer__legal-links a {
    color: var(--color-text);
    opacity: 0.7;
    transition: opacity var(--transition-fast), color var(--transition-fast);
}

.footer__legal-links a:hover,
.footer__legal-links a:focus {
    opacity: 1;
    color: var(--color-accent-secondary);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 992px) {
    .footer__inner {
        grid-template-columns: 1fr 1fr;
    }

    .footer__brand {
        grid-column: 1 / -1;
    }
}

@media (max-width: 768px) {
    :root {
        --container-padding: var(--spacing-16);
    }

    /* Header Mobile */
    .header {
        padding-block: var(--spacing-12);
    }

    .header__inner {
        gap: var(--spacing-12);
    }

    .header__logo-img {
        height: 32px;
    }

    .header__actions {
        flex-direction: row;
        gap: var(--spacing-8);
    }

    .lang-switcher {
        border-radius: var(--radius-sm);
    }

    .lang-switcher__btn {
        padding: var(--spacing-4) var(--spacing-8);
    }

    .btn {
        padding: var(--spacing-8) var(--spacing-12);
    }

    /* Hero Mobile */
    .hero {
        min-height: 200px;
        max-height: 280px;
        padding-block: var(--spacing-24);
        background-size: 120px auto;
    }

    .hero__title {
        font-size: clamp(1.5rem, 6vw, 2rem);
    }

    .hero__subtitle {
        font-size: clamp(0.875rem, 3vw, 1rem);
    }

    /* Content Mobile */
    .main {
        padding-block: var(--spacing-32);
    }

    .content-section__links {
        flex-direction: column;
        gap: var(--spacing-16);
    }

    /* Footer Mobile */
    .footer {
        padding-block: var(--spacing-32);
    }

    .footer__inner {
        grid-template-columns: 1fr;
        gap: var(--spacing-24);
        text-align: center;
    }

    .footer__brand {
        align-items: center;
    }

    .footer__logo-img {
        height: 28px;
    }

    .footer__contact {
        align-items: center;
    }

    .footer__contact-item {
        justify-content: center;
    }

    .footer__section {
        text-align: center;
    }

    .footer__section h3 {
        margin-block-end: var(--spacing-12);
    }

    .footer__nav-list {
        align-items: center;
        gap: var(--spacing-8);
    }

    .footer__bottom {
        margin-block-start: var(--spacing-24);
        padding-block-start: var(--spacing-16);
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-12);
    }

    .footer__legal-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: var(--spacing-16);
    }

}

/* Extra small devices */
@media (max-width: 480px) {
    :root {
        --container-padding: var(--spacing-12);
    }

    .header__logo-img {
        height: 28px;
    }

    .btn {
        padding: var(--spacing-8) var(--spacing-8);
    }

    .hero {
        min-height: 160px;
        max-height: 220px;
    }

    .footer__contact-item svg {
        width: 16px;
        height: 16px;
    }
}

/* Overlay for mobile menu */
.nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 150;
}

.nav-overlay.is-visible {
    display: block;
}

/* Skip Link for Accessibility */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-accent-primary);
    color: var(--color-background);
    padding: var(--spacing-12) var(--spacing-24);
    border-radius: var(--radius-sm);
    z-index: 1000;
    font-weight: 500;
}

.skip-link:focus {
    top: var(--spacing-16);
    color: var(--color-background);
}

/* Focus Styles */
:focus-visible {
    outline: 2px solid var(--color-accent-secondary);
    outline-offset: 2px;
}

/* Print Styles */
@media print {
    .header,
    .footer,
    .lang-switcher {
        display: none;
    }

    .main {
        padding: 0;
    }

    body {
        background: white;
        color: black;
    }
}