/**
 * Piins Design System
 * Enterprise-grade B2B fintech visual foundation
 *
 * This file provides platform-level design tokens, typography,
 * spacing, component styles, and animations.
 * Organization/role theming is handled in themes.css.
 */

/* ==============================================
   PLATFORM DESIGN TOKENS
   ============================================== */
:root {
    /* Platform Colors — used for chrome, unauthenticated pages */
    --platform-navy: #0A2540;
    --platform-navy-light: #1B3A5C;
    --platform-navy-dark: #071C30;
    --platform-accent: #00D4AA;
    --platform-accent-hover: #00E4BA;
    --platform-accent-muted: rgba(0, 212, 170, 0.12);
    --platform-indigo: #635BFF;
    --platform-indigo-muted: rgba(99, 91, 255, 0.12);

    /* Platform Gradients */
    --platform-gradient-hero: linear-gradient(135deg, #0A2540 0%, #1B3A5C 50%, #0F2D4A 100%);
    --platform-gradient-accent: linear-gradient(135deg, #00D4AA 0%, #00B4D8 100%);
    --platform-gradient-surface: linear-gradient(180deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 100%);
    --platform-gradient-mesh: radial-gradient(ellipse at 20% 50%, rgba(99,91,255,0.12) 0%, transparent 50%),
                              radial-gradient(ellipse at 80% 20%, rgba(0,212,170,0.08) 0%, transparent 50%);

    /* Neutral Palette */
    --neutral-50: #F7F9FC;
    --neutral-100: #EDF1F7;
    --neutral-200: #D8DFE9;
    --neutral-300: #B8C4D0;
    --neutral-400: #9BAAB9;
    --neutral-500: #6B7A8D;
    --neutral-600: #4A5568;
    --neutral-700: #2D3748;
    --neutral-800: #1A202C;
    --neutral-900: #0F1419;

    /* Status Colors */
    --color-success: #00C48C;
    --color-success-bg: rgba(0, 196, 140, 0.08);
    --color-warning: #F5A623;
    --color-warning-bg: rgba(245, 166, 35, 0.08);
    --color-error: #E25C5C;
    --color-error-bg: rgba(226, 92, 92, 0.08);
    --color-info: #4A9FE5;
    --color-info-bg: rgba(74, 159, 229, 0.08);

    /* Typography */
    --font-display: 'Inter', 'SF Pro Display', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', 'Consolas', monospace;

    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    /* Spacing */
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 20px;
    --space-6: 24px;
    --space-8: 32px;
    --space-10: 40px;
    --space-12: 48px;
    --space-16: 64px;
    --space-20: 80px;
    --space-24: 96px;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-xs: 0 1px 2px rgba(10, 37, 64, 0.05);
    --shadow-sm: 0 2px 4px rgba(10, 37, 64, 0.06);
    --shadow-md: 0 4px 12px rgba(10, 37, 64, 0.08);
    --shadow-lg: 0 8px 30px rgba(10, 37, 64, 0.12);
    --shadow-xl: 0 16px 48px rgba(10, 37, 64, 0.16);
    --shadow-glow-accent: 0 4px 16px rgba(0, 212, 170, 0.25);
    --shadow-glow-indigo: 0 4px 16px rgba(99, 91, 255, 0.25);

    /* Transitions */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
    --duration-reveal: 600ms;
}

/* ==============================================
   TYPOGRAPHY
   ============================================== */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* ==============================================
   BASE PLATFORM STYLES
   (Applied to unauthenticated / chrome areas)
   ============================================== */

/* Platform Nav */
.platform-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
    background: var(--platform-navy);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    padding: 0 var(--space-6);
    height: 64px;
    display: flex;
    align-items: center;
    transition: background var(--duration-normal) var(--ease-out),
                box-shadow var(--duration-normal) var(--ease-out);
}

.platform-nav.scrolled {
    background: rgba(10, 37, 64, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
}

.platform-nav .nav-inner {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.platform-nav .nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    color: #FFFFFF;
    font-weight: 700;
    font-size: var(--text-lg);
    letter-spacing: -0.01em;
}

.platform-nav .nav-brand img {
    height: 32px;
}

.platform-nav .nav-brand span {
    opacity: 0.6;
    font-weight: 400;
    font-size: var(--text-sm);
    margin-left: var(--space-2);
}

.platform-nav .nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.platform-nav .nav-user-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    margin-right: var(--space-3);
    line-height: 1.3;
}

.platform-nav .nav-user-name {
    color: #FFFFFF;
    font-size: var(--text-sm);
    font-weight: 600;
}

.platform-nav .nav-user-detail {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--text-xs);
}

/* --- Role accent strip on bottom of nav --- */
.platform-nav::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: transparent;
    transition: background 0.3s ease, box-shadow 0.3s ease;
}

/* Admin — electric blue */
.platform-nav.role-admin::after {
    background: #3B82F6;
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.7);
}

/* Agent — rose */
.platform-nav.role-agent::after {
    background: #F43F5E;
    box-shadow: 0 0 16px rgba(244, 63, 94, 0.7);
}

/* Supplier — hot orange */
.platform-nav.role-supplier::after {
    background: #F97316;
    box-shadow: 0 0 16px rgba(249, 115, 22, 0.7);
}

/* Accountant — vivid purple */
.platform-nav.role-accountant::after {
    background: #A855F7;
    box-shadow: 0 0 16px rgba(168, 85, 247, 0.7);
}

/* --- Role badge base --- */
.platform-nav .nav-role-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    white-space: nowrap;
    border: none;
}

.platform-nav .nav-role-badge i {
    font-size: 0.6875rem;
}

/* Admin — solid purple */
.platform-nav .nav-role-badge.nav-role-admin {
    background: #7C3AED;
    color: #FFFFFF;
    box-shadow: 0 0 16px rgba(124, 58, 237, 0.5), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Agent — rose */
.platform-nav .nav-role-badge.nav-role-agent {
    background: #F43F5E;
    color: #FFFFFF;
    box-shadow: 0 0 16px rgba(244, 63, 94, 0.5), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Supplier — solid orange */
.platform-nav .nav-role-badge.nav-role-supplier {
    background: #F97316;
    color: #FFFFFF;
    box-shadow: 0 0 16px rgba(249, 115, 22, 0.5), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Agent Admin — solid blue */
.platform-nav .nav-role-badge.nav-role-agent-admin {
    background: #3B82F6;
    color: #FFFFFF;
    box-shadow: 0 0 16px rgba(59, 130, 246, 0.5), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Supplier Admin — vivid bright amber, larger */
.platform-nav .nav-role-badge.nav-role-supplier-admin {
    background: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
    color: #FFFFFF;
    font-size: 0.8125rem;
    padding: 7px 18px;
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.6), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Accountant — solid teal */
.platform-nav .nav-role-badge.nav-role-accountant {
    background: #0D9488;
    color: #FFFFFF;
    box-shadow: 0 0 16px rgba(13, 148, 136, 0.5), 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* ==============================================
   BUTTON SYSTEM
   ============================================== */

/* Base button reset */
.btn-platform {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 10px 20px;
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-md);
    border: 1.5px solid transparent;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--duration-normal) var(--ease-out);
    white-space: nowrap;
}

.btn-platform:focus-visible {
    outline: 2px solid var(--platform-accent);
    outline-offset: 2px;
}

/* Primary — accent fill */
.btn-platform-primary {
    background: var(--platform-accent);
    color: var(--platform-navy);
    border-color: var(--platform-accent);
}

.btn-platform-primary:hover {
    background: var(--platform-accent-hover);
    color: var(--platform-navy);
    border-color: var(--platform-accent-hover);
    transform: translateY(-1px);
    box-shadow: var(--shadow-glow-accent);
}

.btn-platform-primary:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 212, 170, 0.2);
}

/* Secondary — outlined on dark */
.btn-platform-secondary {
    background: transparent;
    color: #FFFFFF;
    border-color: rgba(255, 255, 255, 0.25);
}

.btn-platform-secondary:hover {
    color: #FFFFFF;
    border-color: rgba(255, 255, 255, 0.5);
    background: rgba(255, 255, 255, 0.05);
}

/* Secondary on light */
.btn-platform-secondary-light {
    background: transparent;
    color: var(--platform-navy);
    border-color: var(--neutral-200);
}

.btn-platform-secondary-light:hover {
    border-color: var(--neutral-400);
    background: var(--neutral-50);
    color: var(--platform-navy);
}

/* Ghost — text link with arrow */
.btn-platform-ghost {
    background: transparent;
    color: var(--platform-accent);
    border: none;
    padding: 6px 2px;
}

.btn-platform-ghost::after {
    content: '\2192';
    transition: transform var(--duration-fast) var(--ease-out);
}

.btn-platform-ghost:hover {
    color: var(--platform-accent-hover);
}

.btn-platform-ghost:hover::after {
    transform: translateX(4px);
}

/* Danger */
.btn-platform-danger {
    background: transparent;
    color: var(--color-error);
    border-color: rgba(226, 92, 92, 0.3);
}

.btn-platform-danger:hover {
    background: var(--color-error);
    color: #FFFFFF;
    border-color: var(--color-error);
}

/* Sizes */
.btn-platform-lg {
    padding: 14px 28px;
    font-size: var(--text-base);
    border-radius: 10px;
}

.btn-platform-sm {
    padding: 6px 14px;
    font-size: var(--text-xs);
    border-radius: var(--radius-sm);
}

/* ==============================================
   CARD SYSTEM
   ============================================== */
.card-platform {
    background: #FFFFFF;
    border: 1px solid var(--neutral-100);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: transform var(--duration-slow) var(--ease-out),
                box-shadow var(--duration-slow) var(--ease-out),
                border-color var(--duration-slow) ease;
}

.card-platform:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    border-color: var(--neutral-200);
}

.card-platform-dark {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.card-platform-dark:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.12);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
}

.card-platform-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--platform-accent-muted) 0%, var(--platform-indigo-muted) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
    color: var(--platform-accent);
    font-size: 1.25rem;
}

.card-platform-title {
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--neutral-800);
    margin-bottom: var(--space-3);
    letter-spacing: -0.01em;
}

.card-platform-desc {
    font-size: var(--text-base);
    color: var(--neutral-500);
    line-height: 1.6;
}

/* Dark variants */
.card-platform-dark .card-platform-title {
    color: #FFFFFF;
}

.card-platform-dark .card-platform-desc {
    color: rgba(255, 255, 255, 0.6);
}

/* ==============================================
   FORM SYSTEM
   ============================================== */
.form-platform-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
}

.form-platform-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--neutral-700);
    letter-spacing: 0.01em;
}

.form-platform-input {
    padding: 12px 16px;
    font-size: var(--text-base);
    font-family: var(--font-body);
    color: var(--neutral-800);
    background: #FFFFFF;
    border: 1.5px solid var(--neutral-200);
    border-radius: var(--radius-md);
    transition: border-color var(--duration-fast) ease,
                box-shadow var(--duration-fast) ease;
    outline: none;
    width: 100%;
}

.form-platform-input::placeholder {
    color: var(--neutral-400);
}

.form-platform-input:hover:not(:focus) {
    border-color: var(--neutral-400);
}

.form-platform-input:focus {
    border-color: var(--platform-accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.12);
}

.form-platform-input.has-error {
    border-color: var(--color-error);
    box-shadow: 0 0 0 3px rgba(226, 92, 92, 0.12);
}

.form-platform-error {
    font-size: var(--text-sm);
    color: var(--color-error);
    margin-top: var(--space-1);
}

.form-platform-help {
    font-size: var(--text-xs);
    color: var(--neutral-500);
    margin-top: var(--space-1);
}

/* ==============================================
   TRUST INDICATORS
   ============================================== */
.trust-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-8);
    flex-wrap: wrap;
    padding: var(--space-4) 0;
}

.trust-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: rgba(255, 255, 255, 0.5);
    white-space: nowrap;
}

.trust-item i {
    font-size: 0.625rem;
}

.trust-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-success);
    flex-shrink: 0;
}

.trust-divider {
    width: 1px;
    height: 16px;
    background: rgba(255, 255, 255, 0.15);
}

/* ==============================================
   SECTION LAYOUTS
   ============================================== */
.section-platform {
    padding: var(--space-24) var(--space-6);
}

.section-platform-sm {
    padding: var(--space-16) var(--space-6);
}

.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header h2 {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-4);
    line-height: 1.2;
}

.section-header p {
    font-size: var(--text-lg);
    line-height: 1.6;
    max-width: 600px;
    margin: 0 auto;
}

/* Dark sections */
.section-dark {
    background: var(--platform-navy);
    color: #FFFFFF;
}

.section-dark .section-header p {
    color: rgba(255, 255, 255, 0.6);
}

/* Light sections */
.section-light {
    background: #FFFFFF;
    color: var(--neutral-800);
}

.section-light .section-header p {
    color: var(--neutral-500);
}

/* Alternate light */
.section-alt {
    background: var(--neutral-50);
    color: var(--neutral-800);
}

.section-alt .section-header p {
    color: var(--neutral-500);
}

/* ==============================================
   GRID LAYOUTS
   ============================================== */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-6);
}

.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-6);
}

.grid-5 {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-6);
}

@media (max-width: 1024px) {
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
    .grid-5 {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .grid-3,
    .grid-2 {
        grid-template-columns: 1fr;
    }
    .grid-5 {
        grid-template-columns: repeat(2, 1fr);
    }

    .section-platform {
        padding: var(--space-16) var(--space-4);
    }

    .section-header h2 {
        font-size: var(--text-3xl);
    }
}

@media (max-width: 480px) {
    .grid-5 {
        grid-template-columns: 1fr;
    }
}

/* ==============================================
   ANIMATIONS
   ============================================== */

/* Scroll-triggered reveal */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--duration-reveal) var(--ease-out),
                transform var(--duration-reveal) var(--ease-out);
}

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

/* Staggered children */
.reveal-group .reveal:nth-child(1) { transition-delay: 0ms; }
.reveal-group .reveal:nth-child(2) { transition-delay: 80ms; }
.reveal-group .reveal:nth-child(3) { transition-delay: 160ms; }
.reveal-group .reveal:nth-child(4) { transition-delay: 240ms; }
.reveal-group .reveal:nth-child(5) { transition-delay: 320ms; }
.reveal-group .reveal:nth-child(6) { transition-delay: 400ms; }

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

/* Subtle pulse for status dots */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
    .reveal-group .reveal {
        transition-delay: 0ms !important;
    }
    .pulse {
        animation: none;
    }
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* ==============================================
   STEP INDICATORS (Registration)
   ============================================== */
.step-platform {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--neutral-100);
    color: var(--neutral-500);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--text-sm);
    transition: all var(--duration-normal) var(--ease-out);
}

.step-platform.active {
    background: var(--platform-accent);
    color: var(--platform-navy);
    transform: scale(1.1);
}

.step-platform.completed {
    background: var(--color-success);
    color: #FFFFFF;
}

.step-connector-platform {
    width: 60px;
    height: 2px;
    background: var(--neutral-200);
    transition: background var(--duration-normal) ease;
}

.step-connector-platform.active {
    background: var(--platform-accent);
}

/* ==============================================
   ALERTS
   ============================================== */
.alert-platform {
    padding: 14px 18px;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-5);
    border-left: 3px solid;
}

.alert-platform-error {
    background: var(--color-error-bg);
    color: #B91C1C;
    border-left-color: var(--color-error);
}

.alert-platform-success {
    background: var(--color-success-bg);
    color: #065F46;
    border-left-color: var(--color-success);
}

.alert-platform-info {
    background: var(--color-info-bg);
    color: #1E40AF;
    border-left-color: var(--color-info);
}

.alert-platform-warning {
    background: var(--color-warning-bg);
    color: #92400E;
    border-left-color: var(--color-warning);
}

/* ==============================================
   PASSWORD STRENGTH
   ============================================== */
.password-strength-platform {
    height: 3px;
    background: var(--neutral-100);
    border-radius: 2px;
    margin-top: var(--space-2);
    overflow: hidden;
}

.password-strength-bar-platform {
    height: 100%;
    width: 0;
    transition: all var(--duration-normal) var(--ease-out);
    border-radius: 2px;
}

.password-strength-bar-platform.weak {
    width: 33%;
    background: var(--color-error);
}

.password-strength-bar-platform.medium {
    width: 66%;
    background: var(--color-warning);
}

.password-strength-bar-platform.strong {
    width: 100%;
    background: var(--color-success);
}

/* ==============================================
   UTILITY CLASSES
   ============================================== */
.text-accent { color: var(--platform-accent); }
.text-muted-light { color: rgba(255, 255, 255, 0.5); }
.text-center { text-align: center; }
.font-mono { font-family: var(--font-mono); }
.fw-600 { font-weight: 600; }
.fw-700 { font-weight: 700; }
.ls-tight { letter-spacing: -0.02em; }