/* ==========================================================================
   Terranova — Shared Buyer Design Tokens
   Single source of truth for colors, glass surfaces, shadows, radii and
   reusable utility classes used across the buyer-facing pages.
   ========================================================================== */

:root {
    /* Brand greens */
    --tn-green-900: #064e3b;
    --tn-green-700: #059669;
    --tn-green-600: #388e3c;
    --tn-green-500: #10b981;
    --tn-emerald-400: #34d399;
    --tn-emerald-100: #d1fae5;

    /* Neutrals */
    --tn-neutral-900: #1f2937;
    --tn-neutral-700: #374151;
    --tn-neutral-500: #6b7280;
    --tn-neutral-200: #e5e7eb;
    --tn-neutral-100: #f3f4f6;
    --tn-neutral-50: #f9fafb;

    /* Semantic states (muted, not saturated) */
    --tn-success: #059669;
    --tn-success-bg: #ecfdf5;
    --tn-warning: #b45309;
    --tn-warning-bg: #fffbeb;
    --tn-danger: #b91c1c;
    --tn-danger-bg: #fef2f2;
    --tn-info: #0f766e;
    --tn-info-bg: #f0fdfa;

    /* Glass surfaces */
    --tn-glass-bg: rgba(255, 255, 255, 0.7);
    --tn-glass-bg-strong: rgba(255, 255, 255, 0.85);
    --tn-glass-border: rgba(255, 255, 255, 0.35);
    --tn-glass-blur: 16px;

    /* Shadows */
    --tn-shadow-sm: 0 1px 3px rgba(6, 78, 59, 0.08);
    --tn-shadow-md: 0 8px 24px rgba(6, 78, 59, 0.12);
    --tn-shadow-lg: 0 20px 45px rgba(6, 78, 59, 0.18);

    /* Radii */
    --tn-radius-sm: 0.5rem;
    --tn-radius-md: 0.875rem;
    --tn-radius-lg: 1.25rem;
    --tn-radius-xl: 1.75rem;
    --tn-radius-pill: 999px;

    --tn-transition: all 0.25s ease;
}

* {
    font-family: 'DM Sans', sans-serif;
}

/* Gradients */
.tn-gradient-bg {
    background: linear-gradient(135deg, var(--tn-green-700) 0%, var(--tn-green-500) 100%);
}

.tn-gradient-header {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
}

.tn-gradient-hero {
    background: linear-gradient(135deg, var(--tn-green-900) 0%, var(--tn-green-700) 50%, var(--tn-green-500) 100%);
}

/* Glass surfaces */
.tn-glass {
    background: var(--tn-glass-bg);
    border: 1px solid rgba(6, 78, 59, 0.08);
    backdrop-filter: blur(var(--tn-glass-blur));
    -webkit-backdrop-filter: blur(var(--tn-glass-blur));
}

.tn-glass-strong {
    background: var(--tn-glass-bg-strong);
    border: 1px solid rgba(6, 78, 59, 0.1);
    backdrop-filter: blur(var(--tn-glass-blur));
    -webkit-backdrop-filter: blur(var(--tn-glass-blur));
    box-shadow: var(--tn-shadow-lg);
}

.tn-glass-on-hero {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    backdrop-filter: blur(var(--tn-glass-blur));
    -webkit-backdrop-filter: blur(var(--tn-glass-blur));
}

/* Cards */
.tn-card {
    background: #ffffff;
    border: 1px solid var(--tn-neutral-200);
    border-radius: var(--tn-radius-lg);
    box-shadow: var(--tn-shadow-sm);
    transition: var(--tn-transition);
}

.tn-card:hover {
    box-shadow: var(--tn-shadow-md);
    transform: translateY(-3px);
    border-color: rgba(5, 150, 105, 0.25);
}

/* Chips / segmented control */
.tn-chip {
    border-radius: var(--tn-radius-pill);
    font-weight: 600;
    transition: var(--tn-transition);
}

.tn-chip-active {
    background: #ffffff;
    color: var(--tn-green-900);
    box-shadow: var(--tn-shadow-sm);
}

.tn-chip-inactive {
    color: rgba(255, 255, 255, 0.9);
}

.tn-chip-inactive:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #ffffff;
}

/* Buttons */
.tn-btn-primary {
    background: linear-gradient(135deg, var(--tn-green-700) 0%, var(--tn-green-500) 100%);
    color: #ffffff;
    border-radius: var(--tn-radius-md);
    font-weight: 600;
    transition: var(--tn-transition);
    box-shadow: var(--tn-shadow-sm);
}

.tn-btn-primary:hover {
    box-shadow: var(--tn-shadow-md);
    transform: translateY(-1px);
}

.tn-btn-secondary {
    background: #ffffff;
    color: var(--tn-green-700);
    border: 1px solid var(--tn-neutral-200);
    border-radius: var(--tn-radius-md);
    font-weight: 600;
    transition: var(--tn-transition);
}

.tn-btn-secondary:hover {
    background: var(--tn-neutral-50);
    border-color: rgba(5, 150, 105, 0.3);
}

/* Inputs */
.tn-input {
    background: #ffffff;
    border: 1px solid var(--tn-neutral-200);
    border-radius: var(--tn-radius-md);
    transition: var(--tn-transition);
}

.tn-input:focus {
    outline: none;
    border-color: var(--tn-green-500);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15);
}

/* Filled variant: tinted field that brightens to white on focus */
.tn-input-filled {
    background-color: #f9fafb;
    border-color: var(--tn-neutral-300, #d1d5db);
}

.tn-input-filled:focus {
    background-color: #ffffff;
}

/* Badges */
.tn-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    border-radius: var(--tn-radius-pill);
    font-size: 0.75rem;
    font-weight: 600;
    padding: 0.25rem 0.625rem;
}

.tn-badge-success {
    background: var(--tn-success-bg);
    color: var(--tn-success);
}

.tn-badge-warning {
    background: var(--tn-warning-bg);
    color: var(--tn-warning);
}

.tn-badge-danger {
    background: var(--tn-danger-bg);
    color: var(--tn-danger);
}

.tn-badge-info {
    background: var(--tn-info-bg);
    color: var(--tn-info);
}

/* Focus ring for accessibility */
.tn-focus-ring:focus-visible {
    outline: none;
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.25);
}

/* Motion */
@keyframes tnFadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: tnFadeInUp 0.6s ease-out forwards;
}

.hover-lift {
    transition: var(--tn-transition);
}

.hover-lift:hover {
    transform: translateY(-4px);
}

/* ==========================================================================
   Public Header — scroll-driven glass effect
   Applied via JS IIFE in publicHeader.html fragment.
   ========================================================================== */

/* Solid state — header at top of page (scroll position 0) */
.header-solid {
  background: var(--tn-green-900);          /* #064e3b */
  border-bottom: 1px solid transparent;
  box-shadow: var(--tn-shadow-sm);
}

/* Glass state — header after 10px scroll */
.header-glass {
  background: rgba(6, 78, 59, 0.88);       /* --tn-green-900 at 88% */
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.18);
  transition: background 0.25s ease, box-shadow 0.25s ease;
}