/* style.css – Eduard's Briefe (Modernisiert & Erweitert) */

/* ── CSS-Variablen für einfache Anpassbarkeit ── */
:root {
    /* Farben (Light Mode) */
    --color-bg: #faf8f3;
    --color-accent: #c9a876;
    --color-accent-dark: #9d7e5d;
    --color-accent-light: #e8dcc8;
    --color-text: #3d3d3d;
    --color-text-light: #6b6b6b;
    --color-light: #f5f3ed;
    --color-white: #ffffff;

    /* Dark Mode Colors */
    --color-bg-dark: #1a1714;
    --color-text-dark: #e8e6e1;
    --color-text-light-dark: #b8b4a8;
    --color-accent-dark-mode: #d4a574;

    /* Typography */
    --font-serif: 'Georgia', 'Cambria', serif;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;

    /* Font Sizes */
    --fs-h1: 2.5rem;
    --fs-h2: 2rem;
    --fs-h3: 1.5rem;
    --fs-h4: 1.25rem;
    --fs-base: 1rem;
    --fs-small: 0.875rem;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 12px;
    --spacing-md: 20px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(61, 61, 61, 0.08);
    --shadow-md: 0 4px 16px rgba(61, 61, 61, 0.12);
    --shadow-lg: 0 12px 32px rgba(61, 61, 61, 0.16);

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: var(--color-bg-dark);
        --color-text: var(--color-text-dark);
        --color-text-light: var(--color-text-light-dark);
        --color-accent: var(--color-accent-dark-mode);
        --color-accent-light: #4a3f2e;
        --color-light: #2a2420;
        --color-white: #2f2a25;
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
        --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
    }
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-serif);
    font-size: var(--fs-base);
    line-height: 1.6;
    letter-spacing: 0.3px;
    transition: background-color var(--transition), color var(--transition);
}

/* ── Typografie: Headings ── */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-sans);
    font-weight: 600;
    letter-spacing: -0.5px;
    margin: var(--spacing-lg) 0 var(--spacing-md) 0;
    color: var(--color-text);
    line-height: 1.2;
}

h1 {
    font-size: var(--fs-h1);
    font-weight: 700;
    letter-spacing: -1px;
    animation: fadeInDown 0.8s ease-out;
}

h2 {
    font-size: var(--fs-h2);
    color: var(--color-accent);
}

h3 {
    font-size: var(--fs-h3);
}

h4 {
    font-size: var(--fs-h4);
    font-weight: 600;
}

p {
    margin: 0 0 var(--spacing-md) 0;
    color: var(--color-text-light);
}

/* ── Animationen ── */

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

body > * {
    animation: fadeIn 0.6s ease-out;
}

/* ── Unterseiten: Briefgalerien ── */

.image-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.image-container a {
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--color-text);
    transition: var(--transition);
    border-radius: 12px;
    overflow: hidden;
    animation: fadeInUp 0.6s ease-out backwards;
}

.image-container a:nth-child(1) { animation-delay: 0.1s; }
.image-container a:nth-child(2) { animation-delay: 0.2s; }
.image-container a:nth-child(3) { animation-delay: 0.3s; }
.image-container a:nth-child(4) { animation-delay: 0.4s; }
.image-container a:nth-child(5) { animation-delay: 0.5s; }
.image-container a:nth-child(6) { animation-delay: 0.6s; }

.image-container a:hover {
    transform: translateY(-8px);
}

.image-container a:hover img {
    filter: brightness(0.92) blur(0px);
    transform: scale(1.02);
}

.image-container a:hover .image-title {
    color: var(--color-accent);
}

.image-container a:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 4px;
}

.image-container img {
    width: 100%;
    height: 280px;
    object-fit: cover;
    display: block;
    border-radius: 12px;
    transition: var(--transition-slow);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(0px);
}

.image-title {
    padding: var(--spacing-md);
    font-size: var(--fs-h4);
    font-family: var(--font-sans);
    font-weight: 600;
    transition: var(--transition);
    color: var(--color-text);
}

/* ── Startseite: Timeline ── */

.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.timeline::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-accent-light) 0%, transparent 100%);
    opacity: 0.02;
    pointer-events: none;
    border-radius: 8px;
}

.timeline::after {
    content: '';
    position: absolute;
    width: 3px;
    background: linear-gradient(180deg, var(--color-accent) 0%, var(--color-accent-dark) 50%, var(--color-accent) 100%);
    top: 0;
    bottom: 0;
    left: 50%;
    margin-left: -1.5px;
    box-shadow: 0 0 12px rgba(201, 168, 118, 0.3);
}

.container {
    padding: var(--spacing-md) var(--spacing-lg);
    position: relative;
    background-color: transparent;
    width: 50%;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.6s ease-out backwards;
}

.container:nth-child(odd) {
    animation: slideInFromLeft 0.7s ease-out backwards;
}

.container:nth-child(even) {
    animation: slideInFromRight 0.7s ease-out backwards;
}

.container:nth-child(1) { animation-delay: 0.2s; }
.container:nth-child(2) { animation-delay: 0.3s; }
.container:nth-child(3) { animation-delay: 0.4s; }
.container:nth-child(4) { animation-delay: 0.5s; }
.container:nth-child(5) { animation-delay: 0.6s; }

.container::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    right: -10px;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
    border: 3px solid var(--color-white);
    top: 30px;
    border-radius: 50%;
    z-index: 1;
    transition: var(--transition);
    box-shadow: 0 0 0 6px var(--color-bg), 0 0 16px rgba(201, 168, 118, 0.4);
}

.container:hover::after {
    transform: scale(1.2);
    box-shadow: 0 0 0 6px var(--color-bg), 0 0 24px rgba(201, 168, 118, 0.6);
}

.left {
    left: 0;
}

.right {
    left: 50%;
}

.left::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 38px;
    width: 0;
    z-index: 1;
    right: -8px;
    border: medium solid var(--color-accent);
    border-width: 8px 0 8px 8px;
    border-color: transparent transparent transparent var(--color-accent);
}

.right::before {
    content: " ";
    height: 0;
    position: absolute;
    top: 38px;
    width: 0;
    z-index: 1;
    left: -8px;
    border: medium solid var(--color-accent);
    border-width: 8px 8px 8px 0;
    border-color: transparent var(--color-accent) transparent transparent;
}

.right::after {
    left: -10px;
}

.content {
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    position: relative;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
    text-align: left;
    transition: var(--transition);
    border-left: 4px solid var(--color-accent);
    border: 1px solid var(--color-accent-light);
    border-left: 4px solid var(--color-accent);
    overflow: hidden;
}

.content::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent) 0%, transparent 100%);
}

.content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-left: 4px solid var(--color-accent-dark);
}

.content:focus-within {
    outline: 2px solid var(--color-accent);
    outline-offset: 0;
}

.timeline .container a {
    text-decoration: none;
    color: var(--color-accent);
    transition: var(--transition);
    font-weight: 600;
    font-family: var(--font-sans);
    position: relative;
}

.timeline .container a::after {
    content: ' →';
    opacity: 0;
    transform: translateX(-8px);
    transition: var(--transition);
    display: inline-block;
}

.timeline .container a:hover {
    color: var(--color-accent-dark);
}

.timeline .container a:hover::after {
    opacity: 1;
    transform: translateX(0);
}

.timeline .container a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 2px;
}

/* ── Buttons & CTAs ── */

button, .btn, .button {
    font-family: var(--font-sans);
    font-size: var(--fs-base);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: 2px solid var(--color-accent);
    background-color: transparent;
    color: var(--color-accent);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    display: inline-block;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

button::before, .btn::before, .button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent 0%, var(--color-accent) 50%, transparent 100%);
    transition: left 0.6s ease;
    opacity: 0.2;
}

button:hover, .btn:hover, .button:hover {
    background-color: var(--color-accent);
    color: var(--color-white);
    box-shadow: 0 8px 20px rgba(201, 168, 118, 0.3);
    transform: translateY(-2px);
}

button:hover::before, .btn:hover::before, .button:hover::before {
    left: 100%;
}

button:active, .btn:active, .button:active {
    transform: translateY(0);
}

button:focus-visible, .btn:focus-visible, .button:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 4px;
}

/* Button Primary */
button.btn-primary, .btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    border-color: var(--color-accent);
}

button.btn-primary:hover, .btn-primary:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    box-shadow: 0 12px 28px rgba(157, 126, 93, 0.3);
}

/* Button Ghost */
button.btn-ghost, .btn-ghost {
    background-color: transparent;
    color: var(--color-accent);
    border-color: var(--color-accent);
}

button.btn-ghost:hover, .btn-ghost:hover {
    background-color: var(--color-accent-light);
    border-color: var(--color-accent);
}

/* ── Links ── */

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition);
    position: relative;
}

a:not(.btn):not(.button):not(.image-container a) {
    text-decoration: underline;
    text-decoration-color: transparent;
    text-underline-offset: 4px;
}

a:not(.btn):not(.button):not(.image-container a):hover {
    text-decoration-color: var(--color-accent);
}

a:focus-visible:not(.btn):not(.button) {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

/* ── Responsive (Tablets & Mobile) ── */

@media screen and (max-width: 768px) {
    :root {
        --fs-h1: 2rem;
        --fs-h2: 1.5rem;
        --fs-h3: 1.25rem;
    }

    .timeline::after {
        left: 30px;
    }

    .container {
        width: 100%;
        padding-left: var(--spacing-xl);
        padding-right: var(--spacing-md);
        margin-bottom: var(--spacing-lg);
    }

    .container::after {
        left: 6px;
        right: auto;
    }

    .container::before {
        left: 16px;
        border: medium solid var(--color-accent);
        border-width: 8px 8px 8px 0;
        border-color: transparent var(--color-accent) transparent transparent;
        right: auto;
    }

    .left::before,
    .left::after,
    .right::before,
    .right::after {
        left: auto;
    }

    .left::before {
        content: none;
    }

    .right {
        left: 0;
    }
}

@media screen and (max-width: 600px) {
    :root {
        --spacing-xl: 32px;
        --spacing-lg: 20px;
        --fs-h1: 1.75rem;
    }

    .image-container {
        grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
        gap: var(--spacing-md);
        padding: var(--spacing-lg);
    }

    .image-container img {
        height: 180px;
    }

    .timeline {
        padding: var(--spacing-lg) var(--spacing-md);
    }

    .container {
        padding-left: var(--spacing-lg);
    }

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

    h1 {
        font-size: var(--fs-h1);
    }

    button, .btn, .button {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: var(--fs-small);
    }
}

/* ── Accessibility & Reduced Motion ── */

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

/* Improved focus states */
*:focus-visible {
    outline-width: 2px;
    outline-offset: 2px;
}

/* Scroll animations */
@media (prefers-reduced-motion: no-preference) {
    .timeline .container {
        opacity: 0.7;
        transition: opacity 0.6s ease;
    }

    .timeline .container:in-view {
        opacity: 1;
    }
}

/* Print Styles */
@media print {
    body {
        background-color: white;
        color: black;
    }

    a {
        color: #0066cc;
    }

    .timeline::after,
    .container::after,
    button, .btn {
        display: none;
    }
}