/*
    Theme: Article-inspired (original index.html)
    Palette and layout tuned for high readability with subtle contrast.
*/
:root {
    /* Core palette from original 1-page layout */
    --bg: #ffffff;
    --fg: #141414;
    --muted: #6b7280;
    --accent: #0047ff;
    --border: #e5e7eb;
    --surface: #f7f7f8;

    /* Typography */
    --size-base: 19px;
    --font-body-sans: system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, "Helvetica Neue", Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    --font-body: var(--font-body-sans);

    /* Back-compat with previous variables (mapped to new palette) */
    --primary-color: var(--fg);
    --secondary-color: #1f2937; /* slightly softer heading tone */
    --accent-color: var(--accent);
    --background-color: var(--bg);
    --message-user-bg: var(--surface);
    --message-assistant-bg: #ffffff;
    --border-color: var(--border);
    --text-dark: var(--fg);
    --text-light: var(--muted);
    /* Use accent instead of brown for visual emphasis */
    --memorial-color: var(--accent);
}

/* Dark mode - manual override hook (if ever added) */
:root[data-theme='dark']{
    --bg:#0b0c0f; --fg:#e7e7ea; --muted:#a1a1aa; --accent:#66a3ff; --border:#2a2b32; --surface:#121318;
    /* Make bubbles distinct in dark mode */
    --message-user-bg: #171a20;
    --message-assistant-bg: var(--surface);
}

/* Dark mode - system preference (when no manual override present) */
@media (prefers-color-scheme: dark){
    :root:not([data-theme='light']){
        --bg:#0b0c0f; --fg:#e7e7ea; --muted:#a1a1aa; --accent:#66a3ff; --border:#2a2b32; --surface:#121318;
        /* Make bubbles distinct in dark mode */
        --message-user-bg: #171a20;
        --message-assistant-bg: var(--surface);
    }
}

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

body {
    font-family: var(--font-body);
    background: var(--bg);
    color: var(--fg);
    line-height: 1.75;
    font-size: var(--size-base);
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 820px;
    margin: 0 auto;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    padding: clamp(1.5rem, 5vw, 3rem) 1rem 1rem;
    background: linear-gradient(180deg, rgba(0,0,0,.06), transparent), var(--surface);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.header-content h1 {
    font-size: clamp(1.6rem, 3.8vw, 2.2rem);
    margin-bottom: .3rem;
    font-weight: 700;
    letter-spacing: .2px;
    color: var(--fg);
}

.subtitle {
    font-size: 1rem;
    color: var(--muted);
    margin-bottom: .75rem;
}

/* Theme controls in header */
.theme-controls {
    display: flex;
    gap: .5rem;
    flex-wrap: wrap;
    align-items: center;
    margin: .5rem 0;
}
.theme-controls .sep { color: var(--muted); }
.theme-controls button {
    appearance: none;
    background: var(--surface);
    color: var(--fg);
    border: 1px solid var(--border);
    border-radius: .5rem;
    padding: .10rem .4rem;
    cursor: pointer;
    font: inherit;
    font-size: .9rem;
    display: inline-flex;
    align-items: center;
    gap: .25rem;
}
.theme-controls button:hover { filter: brightness(0.97); }
.theme-controls button[aria-pressed='true']{ background: var(--accent); color:#fff; border-color: var(--accent); }

/* Make language buttons (DE/EN) visually match the SVG theme buttons */
#langDe, #langEn {
    width: 28px;
    height: 28px;
    padding: 0; /* same compact feel as icon buttons */
    display: inline-grid;
    place-items: center;
    font-weight: 600;
    font-size: .8rem; /* balanced letter size vs 16px icon */
    line-height: 1;
}

.info-box {
    background: var(--surface);
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border);
    border-left: 4px solid var(--memorial-color);
    margin-top: 2rem;
}

.info-box {
    background: var(--surface);
    padding: .75rem;
    border-radius: 6px;
    }
.info-box p:last-child {
    margin-bottom: 0;
}

.chat-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    border-radius: 8px;
    border: 1px solid var(--border);
    box-shadow: 0 6px 16px rgba(0,0,0,.06);
    overflow: hidden;
    margin-bottom: 1rem;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    min-height: 360px;
    max-height: 520px;
}

.message {
    margin-bottom: 20px;
    display: flex;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-content {
    max-width: 72%;
    padding: 12px 14px;
    border-radius: 12px;
    line-height: 1.75;
}

.user-message {
    justify-content: flex-end;
}

.user-message .message-content {
    background-color: var(--message-user-bg);
    color: var(--fg);
    border: 1px solid var(--border);
    border-bottom-right-radius: 6px;
}

.assistant-message .message-content {
    background-color: var(--message-assistant-bg);
    border: 1px solid var(--border);
    border-bottom-left-radius: 6px;
}

.assistant-message .message-content p {
    margin-bottom: 8px;
}

.assistant-message .message-content p:last-child {
    margin-bottom: 0;
}

.typing-indicator {
    display: flex;
    align-items: center;
    padding: 15px 20px;
    gap: 8px;
}

/* Only animate the three dots, not the step text */
.typing-dots span {
    height: 6px;
    width: 6px;
    background-color: #b3bcc2;
    border-radius: 50%;
    display: inline-block;
    margin-right: 4px;
    animation: typing 1.4s infinite;
}
.typing-dots span:nth-child(2) {
    animation-delay: 0.2s;
}
.typing-dots span:nth-child(3) {
    animation-delay: 0.4s;
}
.progress-steps {
    color: var(--muted);
    font-size: 0.95em;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}
.progress-steps .step-text { display: inline-block; }

/* Circular spinner to replace dots when used */
.typing-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid rgba(179, 188, 194, 0.5);
    border-top-color: var(--accent);

    border-radius: 50%;
    display: inline-block;
    animation: spin 0.9s linear infinite;
}

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

/* Remove border around the typing indicator bubble (spinner + waiting text) */
#typing-indicator .message-content {
    border: none;
}

@keyframes typing {
    0%, 60%, 100% {
        transform: translateY(0);
        opacity: 0.7;
    }
    30% {
        transform: translateY(-10px);
        opacity: 1;
    }
}

/* Progressive loading steps text */
.progress-steps {
    color: var(--muted);
    font-size: 0.95em;
}

.chat-input-container {
    border-top: 1px solid var(--border);
    padding: 14px 16px;
    background-color: var(--surface);
}

#chat-form {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

#user-input {
    flex: 1;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 1em;
    outline: none;
    background: var(--bg);
    color: var(--fg); /* ensure dark text in light mode (and light in dark mode) */
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

#user-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 71, 255, 0.2);
}

#send-button {
    padding: 10px 14px;
    background-color: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
    border-radius: 8px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

#send-button:hover {
    filter: brightness(0.95);
    box-shadow: 0 2px 6px rgba(0, 71, 255, 0.25);
}

#send-button:disabled {
    background-color: #b7c4cf;
    border-color: #b7c4cf;
    cursor: not-allowed;
}

.reset-button {
    width: 100%;
    padding: 8px;
    background-color: transparent;
    color: var(--accent);
    border: 1px solid var(--accent);
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s ease, color 0.2s ease, box-shadow 0.2s ease, filter 0.2s ease;
}

.reset-button:hover {
    background-color: var(--accent);
    color: #fff;
    box-shadow: 0 2px 6px rgba(0, 71, 255, 0.25);
}

footer {
    text-align: center;
    padding: 16px;
    color: var(--muted);
    border-top: 1px solid var(--border);
}

footer p {
    margin-bottom: 5px;
}

.disclaimer {
    font-size: 0.9em;
    font-style: italic;
}

/* Scrollbar styling */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: var(--surface);
}

.chat-messages::-webkit-scrollbar-thumb {
    background: var(--muted);
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Responsive design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    .header-content h1 {
        font-size: 1.5em;
    }

    .message-content {
        max-width: 90%;
    }

    #chat-form {
        flex-direction: column;
    }

    #send-button {
        width: 100%;
    }
}