/* =========================================
   PDA Agents - WHW Design System
   Bold industrial aesthetic
   ========================================= */

@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;600;700&family=JetBrains+Mono:wght@400;600&display=swap');

/* --- Custom Properties --- */
:root {
    --bg: #1a1d21;
    --bg-card: #22262b;
    --text: #e0e0e0;
    --text-dim: #888;
    --accent: #ff6b00;
    --accent-hover: #ff8533;
    --border: #3a3f45;
    --border-strong: #4a4f55;
    --status-online: hsl(145, 65%, 45%);
    --status-offline: hsl(0, 75%, 55%);
    --status-starting: hsl(38, 95%, 55%);

    --font: 'Space Grotesk', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'SF Mono', Consolas, monospace;
    --radius: 4px;
    --radius-sm: 3px;
    --radius-xs: 2px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font);
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

a {
    color: inherit;
    text-decoration: none;
}

img, svg {
    display: block;
}

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

.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 80px 0;
    scroll-margin-top: 80px;
}

.section-title {
    font-size: clamp(0.85rem, 1.5vw, 1rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: 64px;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
}

/* --- Gradient Text (replaced with solid accent) --- */
.gradient-text {
    color: var(--accent);
    -webkit-text-fill-color: var(--accent);
}

/* --- Header --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: var(--bg);
    border-bottom: 2px solid var(--border-strong);
    transition: background var(--transition);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.logo-icon {
    flex-shrink: 0;
}

.logo-icon {
    color: var(--accent);
}

.logo-highlight {
    color: var(--accent);
}

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-dim);
    transition: color var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-link:hover {
    color: var(--accent);
}

.nav-github {
    display: flex;
    align-items: center;
}

.nav-github svg {
    opacity: 0.55;
    transition: opacity var(--transition);
}

.nav-github:hover svg {
    opacity: 1;
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.8rem;
    font-weight: 600;
}

.lang-sep {
    color: var(--border);
}

.lang-btn {
    color: var(--text-dim);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 4px 6px;
    border-radius: var(--radius-xs);
    transition: color var(--transition), background var(--transition);
}

.lang-btn:hover {
    color: var(--text);
}

.lang-btn.active {
    color: var(--accent);
    background: rgba(255, 107, 0, 0.1);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 4px;
}

.mobile-menu-btn span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--text);
    border-radius: 1px;
    transition: transform var(--transition), opacity var(--transition);
}

/* --- Hero --- */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: var(--bg);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    padding-top: 72px;
}

.pill-badge {
    display: inline-block;
    padding: 8px 20px;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    border: 3px solid var(--accent);
    border-radius: var(--radius);
    margin-bottom: 32px;
    background: transparent;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.hero-subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem);
    color: var(--text-dim);
    max-width: 560px;
    margin: 0 auto 48px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: var(--accent);
    color: #fff;
    border: 3px solid var(--accent);
    box-shadow: 0 4px 20px rgba(255, 107, 0, 0.25);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 8px 30px rgba(255, 107, 0, 0.35);
}

.btn-secondary {
    background: transparent;
    color: var(--text);
    border: 3px solid var(--border-strong);
}

.btn-secondary:hover {
    border-color: var(--accent);
    color: var(--accent);
}

/* --- Scroll Indicator --- */
.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-dim);
    border-bottom: 2px solid var(--text-dim);
    transform: rotate(45deg);
    animation: scrollBounce 2s infinite;
    opacity: 0.4;
}

@keyframes scrollBounce {
    0%, 100% { transform: rotate(45deg) translate(0, 0); opacity: 0.4; }
    50% { transform: rotate(45deg) translate(6px, 6px); opacity: 0.8; }
}

/* --- Stats --- */
.stats {
    padding: 40px 0;
    border-bottom: 2px solid var(--border-strong);
    scroll-margin-top: 80px;
}

body.authenticated .stats {
    padding-top: 112px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.stat-card {
    text-align: center;
    padding: 32px 16px;
    background: var(--bg-card);
    border: 3px solid var(--border-strong);
    border-radius: var(--radius);
}

.stat-value {
    display: block;
    font-family: var(--font);
    font-size: 1.75rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--accent);
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.65rem;
    color: var(--text-dim);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* --- Agents --- */
.agents-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 24px;
}

.agent-card {
    background: var(--bg-card);
    border: 3px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 28px;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.agent-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    border-color: var(--accent);
}

.agent-header {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    margin-bottom: 16px;
}

.agent-status {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-family: var(--font-mono);
}

.agent-status .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    display: inline-block;
}

.agent-status.online .dot {
    background: var(--status-online);
    box-shadow: 0 0 6px var(--status-online), 0 0 12px rgba(56, 161, 105, 0.3);
    animation: pulse 2s infinite;
}

.agent-status.offline .dot {
    background: var(--status-offline);
    opacity: 0.6;
}

.agent-status.starting .dot {
    background: var(--status-starting);
    box-shadow: 0 0 6px var(--status-starting);
    animation: pulse 1.5s infinite;
}

.agent-status.online { color: var(--status-online); }
.agent-status.offline { color: var(--status-offline); }
.agent-status.starting { color: var(--status-starting); }

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.agent-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.agent-desc {
    font-size: 0.9rem;
    color: var(--text-dim);
    line-height: 1.6;
    margin-bottom: 20px;
    flex: 1;
}

.agent-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.tag {
    display: inline-block;
    padding: 4px 12px;
    font-size: 0.65rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    border-radius: 0;
    border: none;
    border-left: 3px solid var(--border-strong);
    color: var(--text-dim);
    background: rgba(255, 255, 255, 0.03);
    font-family: var(--font-mono);
}

.tag.mcp {
    border-left-color: var(--accent);
    color: var(--accent);
    background: rgba(255, 107, 0, 0.06);
}

.tag.a2a {
    border-left-color: var(--accent);
    color: var(--accent);
    background: rgba(255, 107, 0, 0.06);
}

.tag.auth {
    border-left-color: var(--status-online);
    color: var(--status-online);
    background: rgba(56, 161, 105, 0.06);
}

.agent-connect-toggle {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    transition: color var(--transition);
    cursor: pointer;
}

.agent-connect-toggle::after {
    content: '↓';
    transition: transform var(--transition);
}

.agent-connect-toggle.open::after {
    transform: rotate(180deg);
}

.agent-connect-toggle:hover {
    color: var(--accent-hover);
}

.agent-connect-panel {
    display: none;
    flex-direction: column;
    gap: 12px;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border);
}

.agent-connect-panel.open {
    display: flex;
}

.agent-connect-label {
    display: block;
    font-size: 0.6rem;
    font-weight: 700;
    color: var(--text-dim);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 6px;
    font-family: var(--font-mono);
}

.agent-connect-item .code-block pre {
    padding: 10px 40px 10px 14px;
}

.agent-connect-item .code-block code {
    font-size: 0.75rem;
}

/* --- Modes --- */
.modes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.mode-card {
    background: var(--bg-card);
    border: 3px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 40px 32px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.mode-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    border-color: var(--accent);
}

.mode-number {
    display: block;
    font-family: var(--font);
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
    margin-bottom: 20px;
    opacity: 0.4;
}

.mode-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.mode-desc {
    font-size: 0.9rem;
    color: var(--text-dim);
    line-height: 1.7;
}

/* --- Protocols --- */
.protocols-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.protocol-card {
    background: var(--bg-card);
    border: 3px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 40px 36px;
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.protocol-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    border-color: var(--accent);
}

.protocol-icon {
    color: var(--accent);
    margin-bottom: 24px;
}

.protocol-name {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.protocol-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 16px;
    font-family: var(--font-mono);
}

.protocol-desc {
    font-size: 0.9rem;
    color: var(--text-dim);
    line-height: 1.7;
    margin-bottom: 24px;
}

.protocol-link {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--accent);
    transition: color var(--transition);
}

.protocol-link:hover {
    color: var(--accent-hover);
}

/* --- Code Blocks (used in agent cards) --- */

.code-block {
    position: relative;
    background: #15171a;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    overflow: hidden;
}

.code-block pre {
    padding: 16px 48px 16px 20px;
    overflow-x: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border) transparent;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.82rem;
    line-height: 1.6;
    color: var(--text);
    white-space: pre;
}

.copy-btn {
    position: absolute;
    top: 12px;
    right: 12px;
    padding: 6px;
    color: var(--text-dim);
    border-radius: var(--radius-xs);
    transition: color var(--transition), background var(--transition);
}

.copy-btn:hover {
    color: var(--accent);
    background: rgba(255, 107, 0, 0.1);
}

.copy-btn.copied {
    color: var(--status-online);
}


/* --- Footer --- */
.footer {
    padding: 48px 0;
    border-top: 2px solid var(--border-strong);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 24px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 20px;
}

.footer-company {
    font-size: 0.85rem;
    color: var(--text-dim);
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    font-size: 0.75rem;
    color: var(--text-dim);
    transition: color var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.footer-links a:hover {
    color: var(--accent);
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--text-dim);
    opacity: 0.6;
    width: 100%;
    text-align: center;
    margin-top: 16px;
}

/* --- Scroll Reveal --- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s cubic-bezier(0.4, 0, 0.2, 1), transform 0.7s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* --- Mobile Menu --- */
.nav.open {
    display: flex;
}

/* --- Responsive: Tablet (<900px) --- */
@media (max-width: 900px) {
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .modes-grid {
        grid-template-columns: 1fr;
        max-width: 480px;
        margin: 0 auto;
    }

    .protocols-grid {
        grid-template-columns: 1fr;
        max-width: 540px;
        margin: 0 auto;
    }


    .agents-grid {
        grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    }

    .section {
        padding: 64px 0;
    }

    .section-title {
        margin-bottom: 48px;
    }
}

/* --- Responsive: Mobile (<600px) --- */
@media (max-width: 600px) {
    .nav {
        display: none;
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        bottom: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 32px;
        background: var(--bg);
    }

    .nav.open {
        display: flex;
    }

    .nav-link {
        font-size: 1.25rem;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-menu-btn.open span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-btn.open span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-btn.open span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .stat-card {
        padding: 20px 12px;
    }

    .hero-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

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

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .footer-brand {
        flex-direction: column;
        gap: 8px;
    }

    .footer-links {
        justify-content: center;
    }

    .section {
        padding: 48px 0;
    }

    .section-title {
        margin-bottom: 36px;
    }

    .container {
        padding: 0 16px;
    }

    .mode-card,
    .protocol-card {
        padding: 24px 20px;
    }
}

/* --- Auth Visibility --- */
.auth-only { display: none !important; }
body.authenticated .auth-only { display: revert !important; }
body.authenticated .public-only { display: none !important; }

/* --- Login Section --- */
.login-section {
    padding: 80px 0 120px;
    display: flex;
    justify-content: center;
    scroll-margin-top: 80px;
}

.login-card {
    background: var(--bg-card);
    border: 3px solid var(--border-strong);
    border-radius: var(--radius);
    padding: 48px 40px;
    max-width: 420px;
    width: 100%;
    margin: 0 auto;
}

.login-title {
    font-size: 0.85rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--accent);
}

.login-field {
    margin-bottom: 20px;
}

.login-field label {
    display: block;
    font-size: 0.65rem;
    font-weight: 700;
    color: var(--text-dim);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.login-input {
    width: 100%;
    padding: 12px 16px;
    font-family: var(--font);
    font-size: 0.95rem;
    color: var(--text);
    background: #15171a;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.login-input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255, 107, 0, 0.15);
}

.login-btn {
    width: 100%;
    margin-top: 8px;
    justify-content: center;
}

.login-error {
    color: hsl(0, 75%, 55%);
    font-size: 0.85rem;
    text-align: center;
    margin-bottom: 12px;
}

/* --- Nav User --- */
.nav-user {
    font-size: 0.85rem;
    color: var(--text-dim);
    font-weight: 500;
}

#logout-btn {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-dim);
    transition: color var(--transition);
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
}

#logout-btn:hover {
    color: var(--accent);
}

/* --- Scrollbar --- */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 0;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-dim);
}

/* --- Selection --- */
::selection {
    background: rgba(255, 107, 0, 0.3);
    color: var(--text);
}