/* ===========================================
   Tennis.de Brand Styles
   =========================================== */

/* CSS Custom Properties / Variables */
:root {
    /* Brand Colors */
    --color-dark: #2b2e39;
    --color-dark-lighter: #3d4150;
    --color-accent-lime: #cdec0d;
    --color-accent-lime-hover: #b8d40c;
    --color-accent-cyan: #20aebd;
    --color-accent-cyan-hover: #1a9aa8;
    
    /* Neutral Colors */
    --color-white: #ffffff;
    --color-black: #000000;
    --color-text: #4c4c4c;
    --color-text-light: #6b6b6b;
    --color-border: #d9d9d9;
    --color-background: #ffffff;
    --color-background-light: #f6f6f6;
    --color-background-muted: #efefef;
    
    /* Typography */
    --font-family: 'Assistant', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-base: 1rem;
    --font-size-sm: 0.875rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    
    /* Layout */
    --container-max-width: 1280px;
    --container-padding: 1.5rem;
    --header-height: 80px;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
}

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

html {
    font-size: 100%;
    -webkit-text-size-adjust: 100%;
    scroll-behavior: smooth;
}

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

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-normal);
}

button {
    font-family: inherit;
    font-size: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

ul, ol {
    list-style: none;
}

/* ===========================================
   Layout
   =========================================== */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.main-content {
    flex: 1;
    padding: var(--space-12) 0;
}

/* ===========================================
   HEADER
   =========================================== */
.site-header {
    background-color: var(--color-white);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* ---- Top Bar ---- */
.header-top-bar {
    background-color: var(--color-background-light);
    border-bottom: 1px solid var(--color-border);
}

.header-top-bar .header-container {
    height: 44px;
    justify-content: flex-end;
    gap: var(--space-6);
}

.top-bar-nav {
    display: none;
}

@media (min-width: 1024px) {
    .top-bar-nav {
        display: block;
    }
}

.top-bar-list {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.top-bar-list a {
    font-size: var(--font-size-sm);
    color: var(--color-text);
    padding: var(--space-2) 0;
    position: relative;
}

.top-bar-list a:hover,
.top-bar-list a:focus {
    color: var(--color-dark);
}

.top-bar-list a.is-active {
    color: var(--color-dark);
}

.top-bar-list a.is-active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-accent-cyan);
}

.top-bar-actions {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

/* ---- Main Header ---- */
.header-main {
    height: 72px;
}

.header-main .header-container {
    height: 100%;
    gap: var(--space-8);
}

/* Header Logo */
.header-logo {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}

.header-logo img {
    height: 36px;
    width: auto;
}

/* Header Navigation */
.header-nav {
    display: none;
    flex: 1;
}

@media (min-width: 1024px) {
    .header-nav {
        display: flex;
        justify-content: center;
    }
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-list > li > a {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    color: var(--color-dark);
    font-weight: var(--font-weight-medium);
    font-size: var(--font-size-base);
    padding: var(--space-2) 0;
    position: relative;
}

.nav-list > li > a:hover,
.nav-list > li > a:focus {
    color: var(--color-text);
}

.nav-list > li > a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent-cyan);
    transition: width var(--transition-normal);
}

.nav-list > li > a:hover::after,
.nav-list > li > a:focus::after {
    width: 100%;
}

.dropdown-icon {
    width: 12px;
    height: 12px;
    transition: transform var(--transition-normal);
}

.nav-list > li > a:hover .dropdown-icon {
    transform: rotate(180deg);
}

/* Shop Button */
.btn-shop {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-dark);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
}

.btn-shop:hover,
.btn-shop:focus {
    border-color: var(--color-dark);
    background-color: var(--color-background-light);
}

.btn-shop svg {
    width: 18px;
    height: 18px;
}

/* Header Action Buttons */
.header-action-btn {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-dark);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-normal);
}

.header-action-btn:hover,
.header-action-btn:focus {
    background-color: var(--color-background-muted);
}

.header-action-btn svg {
    width: 22px;
    height: 22px;
}

/* Auth State Icons */
.header-auth-icons {
    display: none;
    align-items: center;
    gap: var(--space-1);
}

.header-auth-icons.active {
    display: flex;
}

.header-action-btn.hidden {
    display: none;
}

.header-auth-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-dark);
    border-radius: var(--radius-full);
    transition: background-color var(--transition-normal);
    cursor: pointer;
}

.header-auth-icon:hover {
    background-color: var(--color-background-muted);
}

.header-auth-icon--profile::before {
    content: '';
    width: 22px;
    height: 22px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%232b2e39' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 21v-2a4 4 0 0 0-4-4H8a4 4 0 0 0-4 4v2'%3E%3C/path%3E%3Ccircle cx='12' cy='7' r='4'%3E%3C/circle%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

.header-auth-icon--logout::before {
    content: '';
    width: 22px;
    height: 22px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%232b2e39' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 21H5a2 2 0 0 1-2-2V5a2 2 0 0 1 2-2h4'%3E%3C/path%3E%3Cpolyline points='16 17 21 12 16 7'%3E%3C/polyline%3E%3Cline x1='21' y1='12' x2='9' y2='12'%3E%3C/line%3E%3C/svg%3E");
    background-size: contain;
    background-repeat: no-repeat;
}

/* Accent Line */
.header-accent-line {
    height: 3px;
    background-color: var(--color-accent-cyan);
}

/* Mobile Menu Button */
.header-menu-btn {
    width: 44px;
    height: 44px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 5px;
    padding: var(--space-2);
}

@media (min-width: 1024px) {
    .header-menu-btn {
        display: none;
    }
}

.header-menu-btn span {
    width: 24px;
    height: 2px;
    background-color: var(--color-dark);
    border-radius: 1px;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* ===========================================
   HERO SECTION
   =========================================== */
.hero {
    text-align: center;
    padding: var(--space-16) 0;
    margin-bottom: var(--space-12);
}

.hero h1 {
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--space-4);
    line-height: var(--line-height-tight);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-light);
    max-width: 600px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .hero {
        padding: var(--space-10) 0;
    }
    
    .hero h1 {
        font-size: var(--font-size-3xl);
    }
    
    .hero-subtitle {
        font-size: var(--font-size-lg);
    }
}

/* ===========================================
   CARDS SECTION
   =========================================== */
.cards-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-8);
}

.card {
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    transition: box-shadow var(--transition-normal), transform var(--transition-normal);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-background-light);
    border-radius: var(--radius-full);
    color: var(--color-dark);
}

.card-icon svg {
    width: 40px;
    height: 40px;
}

.card-title {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-dark);
    margin-bottom: var(--space-3);
}

.card-text {
    color: var(--color-text-light);
    margin-bottom: var(--space-6);
    line-height: var(--line-height-relaxed);
}

/* ===========================================
   BUTTONS
   =========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
    text-decoration: none;
    cursor: pointer;
    min-height: 48px;
}

.btn-primary {
    background-color: var(--color-accent-lime);
    color: var(--color-dark);
}

.btn-primary:hover,
.btn-primary:focus {
    background-color: var(--color-accent-lime-hover);
}

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

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-dark-lighter);
}

.btn-outline {
    background-color: transparent;
    color: var(--color-dark);
    border: 2px solid var(--color-dark);
}

.btn-outline:hover,
.btn-outline:focus {
    background-color: var(--color-dark);
    color: var(--color-white);
}

/* ===========================================
   FOOTER
   =========================================== */
.site-footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    margin-top: auto;
}

.footer-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Footer Top */
.footer-top {
    padding: var(--space-16) 0;
}

.footer-top .footer-container {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-10);
}

@media (min-width: 768px) {
    .footer-top .footer-container {
        grid-template-columns: 1fr 2fr 1fr;
        align-items: start;
    }
}

/* Footer Brand */
.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer-logo svg {
    height: 32px;
    width: auto;
}

/* Footer Navigation */
.footer-nav {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-8);
}

.footer-nav-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--space-4);
    color: var(--color-white);
}

.footer-nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-nav-list a {
    color: rgba(255, 255, 255, 0.8);
    font-size: var(--font-size-sm);
    transition: color var(--transition-normal);
}

.footer-nav-list a:hover,
.footer-nav-list a:focus {
    color: var(--color-accent-lime);
}

/* Footer Social */
.footer-social {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.footer-social-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
}

.footer-social-links {
    display: flex;
    gap: var(--space-3);
}

.footer-social-links a {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--color-dark-lighter);
    border-radius: var(--radius-full);
    color: var(--color-white);
    transition: background-color var(--transition-normal), color var(--transition-normal);
}

.footer-social-links a:hover,
.footer-social-links a:focus {
    background-color: var(--color-accent-lime);
    color: var(--color-dark);
}

.footer-social-links svg {
    width: 20px;
    height: 20px;
}

/* Footer Bottom */
.footer-bottom {
    border-top: 1px solid var(--color-dark-lighter);
    padding: var(--space-6) 0;
}

.footer-bottom .footer-container {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: center;
    text-align: center;
}

@media (min-width: 768px) {
    .footer-bottom .footer-container {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
}

.footer-legal {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
    justify-content: center;
}

.footer-legal a {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-normal);
}

.footer-legal a:hover,
.footer-legal a:focus {
    color: var(--color-white);
}

/* ===========================================
   UTILITY CLASSES
   =========================================== */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* ===========================================
   UNIDY SDK COMPONENT STYLES (Prepared)
   =========================================== */

/* These styles will be used when integrating the Unidy SDK */

/* Form Fields */
u-field::part(field_label) {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

u-field::part(input_field),
u-field::part(select_field),
u-field::part(textarea_field) {
    width: 100%;
    padding: var(--space-3) var(--space-4);
    font-size: var(--font-size-base);
    font-family: var(--font-family);
    color: var(--color-text);
    background-color: var(--color-white);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

u-field::part(input_field):focus,
u-field::part(select_field):focus,
u-field::part(textarea_field):focus {
    outline: none;
    border-color: var(--color-accent-cyan);
    box-shadow: 0 0 0 3px rgba(32, 174, 189, 0.15);
}

u-field::part(required-indicator) {
    color: #dc2626;
    margin-left: var(--space-1);
}

/* Submit Button */
u-submit-button::part(button),
u-logout-button::part(button) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    padding: var(--space-3) var(--space-6);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-family: var(--font-family);
    background-color: var(--color-accent-lime);
    color: var(--color-dark);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-normal);
    min-height: 48px;
}

u-submit-button::part(button):hover,
u-logout-button::part(button):hover {
    background-color: var(--color-accent-lime-hover);
}

/* Newsletter Checkbox */
u-newsletter-checkbox::part(checkbox) {
    width: 20px;
    height: 20px;
    accent-color: var(--color-accent-lime);
}

/* Flash Messages */
u-flash-message::part(success) {
    background-color: #dcfce7;
    color: #166534;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
}

u-flash-message::part(error) {
    background-color: #fee2e2;
    color: #991b1b;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
}