/* ============================================================
   platform.css — AntennaForge Unified Design System
   Phase A Foundation · 2026-03-07
   
   Purpose: Single source of truth for CSS variables, typography,
   top nav bar, cards, buttons, and shared component styles.
   Consumed by hamfeeds base.html and antenna-classifier via nginx.
   ============================================================ */

/* ---------- 1. Design Tokens ---------- */

:root {
    /* 1.1 Base Palette — "Warm Dark" */
    --bg:              #0e1225;
    --surface:         #161a2e;
    --surface-raised:  #1e2340;
    --border:          #2a3050;
    --border-subtle:   #1e2340;
    --text:            #e8ecf4;
    --text-muted:      #8b92a8;
    --text-faint:      #7e8da3;

    /* 1.2 Accent Palette — "Aurora" */
    --accent-primary:       #8b5cf6;
    --accent-primary-soft:  #a78bfa;
    --accent-secondary:     #10b981;
    --accent-secondary-soft:#34d399;
    --accent-warm:          #f59e0b;
    --accent-danger:        #ef4444;

    /* 1.3 Special Surfaces */
    --hero-gradient: linear-gradient(135deg, #0e1225 0%, #1a1040 50%, #241535 100%);
    --aurora-glow:   radial-gradient(circle at 8% 12%, rgba(16, 185, 129, 0.08), transparent 40%),
                     radial-gradient(circle at 88% 8%, rgba(139, 92, 246, 0.10), transparent 45%),
                     radial-gradient(circle at 50% 95%, rgba(245, 158, 11, 0.06), transparent 50%);

    /* 1.4 Nav */
    --nav-bg:     #0b0f1e;
    --nav-height: 56px;
    --nav-active: rgba(139, 92, 246, 0.15);
    --nav-hover:  rgba(139, 92, 246, 0.08);

    /* 1.5 Typography */
    --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono:  'JetBrains Mono', 'Fira Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', monospace;

    /* 1.6 Radii */
    --radius-sm:  6px;
    --radius-md:  8px;
    --radius-lg: 12px;
}

/* ---------- 2. Reset & Base ---------- */

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

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.6;
    color: var(--text);
    background: var(--bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--accent-primary-soft);
    text-decoration: none;
}
a:hover {
    color: var(--accent-primary);
}

/* ---------- 3. Top Nav Bar ---------- */

.platform-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--nav-bg);
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    align-items: center;
    padding: 0 20px;
    z-index: 1000;
    gap: 4px;
}

.platform-nav__brand {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text);
    font-weight: 700;
    font-size: 16px;
    margin-right: 24px;
    flex-shrink: 0;
}

.platform-nav__brand-icon {
    color: var(--accent-primary);
    font-size: 18px;
}

.platform-nav__links {
    display: flex;
    align-items: center;
    gap: 2px;
    flex: 1;
    min-width: 0;
}

.platform-nav__link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    transition: color 0.15s, background 0.15s;
    position: relative;
}

.platform-nav__link:hover {
    color: var(--text);
    background: var(--nav-hover);
}

.platform-nav__link.active {
    color: var(--accent-primary-soft);
    background: var(--nav-active);
}

.platform-nav__link.active::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 14px;
    right: 14px;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 1px;
}

.platform-nav__link-icon {
    font-size: 15px;
    line-height: 1;
}

/* Right section: user menu */
.platform-nav__right {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-left: auto;
    flex-shrink: 0;
}

.platform-nav__user-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 12px;
    border-radius: var(--radius-md);
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-family: var(--font-sans);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s, border-color 0.15s, background 0.15s;
    position: relative;
}

.platform-nav__user-btn:hover {
    color: var(--text);
    border-color: var(--accent-primary);
    background: var(--nav-hover);
}

.platform-nav__user-btn .caret {
    font-size: 10px;
    opacity: 0.6;
}

/* Dropdown */
.platform-nav__dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    right: 0;
    min-width: 180px;
    background: var(--surface-raised);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 6px;
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
    z-index: 1010;
}

.platform-nav__dropdown.open {
    display: block;
}

.platform-nav__dropdown-item {
    display: block;
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    text-decoration: none;
    font-size: 13px;
    transition: color 0.15s, background 0.15s;
}

.platform-nav__dropdown-item:hover {
    color: var(--text);
    background: var(--nav-hover);
}

.platform-nav__dropdown-item--danger {
    color: var(--accent-danger);
}

.platform-nav__dropdown-item--danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--accent-danger);
}

.platform-nav__dropdown-sep {
    height: 1px;
    background: var(--border-subtle);
    margin: 4px 6px;
}

/* Auth links (Login / Sign Up for anonymous) */
.platform-nav__auth-link {
    padding: 8px 16px;
    border-radius: var(--radius-md);
    font-size: 13px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.15s;
}

.platform-nav__auth-link--login {
    color: var(--text-muted);
}
.platform-nav__auth-link--login:hover {
    color: var(--text);
}

.platform-nav__auth-link--signup {
    background: var(--accent-primary);
    color: #fff;
}
.platform-nav__auth-link--signup:hover {
    background: var(--accent-primary-soft);
}

/* Hamburger (mobile) */
.platform-nav__hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 36px;
    height: 36px;
    padding: 6px;
    background: transparent;
    border: none;
    cursor: pointer;
    border-radius: var(--radius-sm);
    transition: background 0.15s;
}

.platform-nav__hamburger:hover {
    background: var(--nav-hover);
}

.platform-nav__hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--text-muted);
    border-radius: 1px;
    transition: transform 0.25s, opacity 0.25s;
}

/* Mobile overlay */
.platform-nav__overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: var(--nav-height);
    background: var(--nav-bg);
    z-index: 999;
    flex-direction: column;
    padding: 16px 20px;
    overflow-y: auto;
}

.platform-nav__overlay.open {
    display: flex;
}

.platform-nav__overlay .platform-nav__link {
    padding: 14px 16px;
    font-size: 16px;
    border-radius: var(--radius-md);
}

.platform-nav__overlay .platform-nav__link.active {
    background: var(--nav-active);
}

.platform-nav__overlay .platform-nav__link.active::after {
    display: none;
}

.platform-nav__overlay-sep {
    height: 1px;
    background: var(--border-subtle);
    margin: 8px 0;
}

.platform-nav__overlay-user {
    padding: 14px 16px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ---------- 4. Main Content ---------- */

.main-content {
    padding-top: var(--nav-height);
    min-height: 100vh;
}

/* ---------- 5. Cards ---------- */

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.card:hover {
    border-color: var(--accent-primary);
    box-shadow: 0 0 20px rgba(139, 92, 246, 0.08);
}

.card--raised {
    background: var(--surface-raised);
}

/* ---------- 6. Buttons ---------- */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 14px;
    font-weight: 600;
    line-height: 1;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn--primary {
    background: var(--accent-primary);
    color: #fff;
}
.btn--primary:hover:not(:disabled) {
    background: var(--accent-primary-soft);
}

.btn--secondary {
    background: transparent;
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}
.btn--secondary:hover:not(:disabled) {
    background: var(--nav-hover);
    color: var(--accent-primary-soft);
}

.btn--success {
    background: var(--accent-secondary);
    color: #fff;
}
.btn--success:hover:not(:disabled) {
    background: var(--accent-secondary-soft);
}

.btn--danger {
    background: var(--accent-danger);
    color: #fff;
}
.btn--danger:hover:not(:disabled) {
    background: #f87171;
}

.btn--ghost {
    background: transparent;
    color: var(--text-muted);
}
.btn--ghost:hover:not(:disabled) {
    background: var(--surface);
    color: var(--text);
}

.btn--sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* ---------- 7. Typography ---------- */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
    line-height: 1.3;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.1rem; }

.text-muted { color: var(--text-muted); }
.text-faint { color: var(--text-faint); }
.font-mono  { font-family: var(--font-mono); }

/* ---------- 8. Status Indicators ---------- */

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

.status-dot--live {
    background: var(--accent-secondary);
    animation: pulse-live 2s ease-in-out infinite;
}

.status-dot--warning {
    background: var(--accent-warm);
}

.status-dot--error {
    background: var(--accent-danger);
}

.status-dot--info {
    background: #58a6ff;
}

@keyframes pulse-live {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ---------- 9. Info Button & Modal ---------- */

.info-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    border: none;
    font-size: 12px;
    font-weight: 700;
    cursor: pointer;
    margin-left: 8px;
    color: var(--bg);
    background: #60a5fa;
}

.info-button.red {
    background: #f87171;
}

.info-button:focus-visible {
    outline: 2px solid var(--text-muted);
    outline-offset: 2px;
}

.info-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(15, 23, 42, 0.7);
    z-index: 2100;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.info-modal.active {
    display: flex;
}

.info-modal-content {
    background: var(--nav-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    max-width: 520px;
    width: 100%;
    padding: 18px;
    color: var(--text);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
    max-height: 85vh;
    display: flex;
    flex-direction: column;
}

.info-modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.info-modal-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
}

.info-modal-close {
    background: transparent;
    border: none;
    color: var(--accent-danger);
    font-size: 16px;
    cursor: pointer;
}

.info-modal-copy {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: #93c5fd;
    font-size: 12px;
    cursor: pointer;
    padding: 4px 8px;
    margin-right: 8px;
}

.info-modal-copy[hidden] {
    display: none;
}

.info-modal-body {
    font-size: 12px;
    color: #cbd5f5;
    line-height: 1.6;
    white-space: pre-wrap;
    overflow: auto;
    max-height: calc(85vh - 72px);
}

.info-modal-body.is-code {
    font-family: var(--font-mono);
    font-size: 13px;
    line-height: 1.5;
    tab-size: 4;
}

.info-modal-body .json-key     { color: #93c5fd; }
.info-modal-body .json-string  { color: #86efac; }
.info-modal-body .json-number  { color: #fca5a5; }
.info-modal-body .json-boolean { color: #fcd34d; }
.info-modal-body .json-null    { color: #c4b5fd; }

/* ---------- 10. Responsive Breakpoints ---------- */

/* Tablet: compact nav labels */
@media (max-width: 1023px) {
    .platform-nav__link {
        padding: 8px 10px;
        font-size: 13px;
    }
    .platform-nav__link-icon {
        font-size: 16px;
    }
    .platform-nav__brand {
        margin-right: 12px;
    }
}

/* Mobile: hamburger + overlay */
@media (max-width: 767px) {
    .platform-nav__links {
        display: none;
    }
    .platform-nav__right .platform-nav__user-btn,
    .platform-nav__right .platform-nav__auth-link {
        display: none;
    }
    .platform-nav__hamburger {
        display: flex;
    }
    .platform-nav__brand span:not(.platform-nav__brand-icon) {
        display: none;
    }
}

/* ---------- 11. Utility ---------- */

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}