/* =========================================================
CredaStamp Unified CSS
Standalone Integrity Proof Utility
========================================================= */

/* ---------- Root Variables ---------- */

:root {
--cs-navy: #0A1F33;
--cs-navy-soft: #12314F;
--cs-accent: #1E90FF;
--cs-accent-dark: #0B6FCC;
--cs-light: #F5F7FA;
--cs-white: #FFFFFF;
--cs-border: #E5E7EB;
--cs-text: #1F2937;
--cs-muted: #6B7280;
--cs-success: #0F766E;
--cs-warning: #B45309;
--cs-danger: #B91C1C;

--cs-max-width: 1080px;
--cs-doc-width: 760px;
--cs-radius: 8px;
--cs-shadow: 0 10px 28px rgba(10, 31, 51, 0.08);
}

/* ---------- Base Reset ---------- */

* {
  box-sizing: border-box;
  }

html {
scroll-behavior: smooth;
}

body {
margin: 0;
font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
background: var(--cs-light);
color: var(--cs-text);
line-height: 1.6;
font-size: 16px;
}

img {
max-width: 100%;
height: auto;
}

a {
color: var(--cs-accent);
text-decoration: none;
}

a:hover {
color: var(--cs-accent-dark);
text-decoration: underline;
}

[hidden] {
  display: none !important;
}

/* ---------- Layout ---------- */

.cs-container {
width: min(100% - 2rem, var(--cs-max-width));
margin: 0 auto;
}

.cs-document {
max-width: var(--cs-doc-width);
}

.cs-section {
padding: 4rem 0;
}

.cs-section-tight {
padding: 2.5rem 0;
}

.cs-divider {
border: 0;
border-top: 1px solid var(--cs-border);
margin: 2rem 0;
}

.cs-grid-2 {
  align-items: start;
}

/* ---------- Header ---------- */

.cs-header {
position: sticky;
top: 0;
z-index: 3000;
background: rgba(255, 255, 255, 0.96);
border-bottom: 1px solid var(--cs-border);
backdrop-filter: blur(10px);
}

.cs-header-inner {
display: flex;
align-items: center;
justify-content: space-between;
min-height: 72px;
gap: 2rem;
}

.cs-brand {
display: flex;
align-items: center;
gap: 0.75rem;
color: var(--cs-navy);
font-weight: 700;
letter-spacing: -0.02em;
}

.cs-brand:hover {
text-decoration: none;
color: var(--cs-navy);
}

.cs-brand-mark {
width: 34px;
height: 34px;
display: block;
}

.cs-brand-text {
font-size: 1.15rem;
}

/* ---------- Navigation ---------- */

.cs-nav {
display: flex;
align-items: center;
gap: 1.5rem;
}

.cs-nav a {
color: var(--cs-text);
font-size: 0.95rem;
font-weight: 500;
}

.cs-nav a:hover,
.cs-nav a.active {
color: var(--cs-accent);
text-decoration: none;
}

.cs-nav .cs-nav-external::after {
content: " ↗";
font-size: 0.85em;
}

.cs-hamburger {
display: none;
border: 0;
background: transparent;
color: var(--cs-navy);
font-size: 1.8rem;
line-height: 1;
cursor: pointer;
}

/* ---------- Hero ---------- */

.cs-hero {
padding: 5rem 0 4rem;
background:
radial-gradient(circle at top right, rgba(30, 144, 255, 0.12), transparent 34rem),
linear-gradient(180deg, #FFFFFF 0%, #F5F7FA 100%);
border-bottom: 1px solid var(--cs-border);
}

.cs-eyebrow {
margin: 0 0 0.75rem;
color: var(--cs-accent-dark);
font-weight: 700;
font-size: 0.85rem;
letter-spacing: 0.08em;
text-transform: uppercase;
}

.cs-hero h1 {
margin: 0;
max-width: 760px;
color: var(--cs-navy);
font-size: clamp(2.35rem, 6vw, 4.25rem);
line-height: 1.05;
letter-spacing: -0.055em;
}

.cs-lead {
max-width: 720px;
margin: 1.25rem 0 0;
color: var(--cs-muted);
font-size: clamp(1.1rem, 2vw, 1.35rem);
}

.cs-hero-actions {
display: flex;
flex-wrap: wrap;
gap: 1rem;
margin-top: 2rem;
}

/* ---------- Typography ---------- */

h1,
h2,
h3,
h4 {
color: var(--cs-navy);
line-height: 1.2;
letter-spacing: -0.025em;
}

h2 {
margin: 0 0 1rem;
font-size: clamp(1.65rem, 3vw, 2.25rem);
}

h3 {
margin: 1.5rem 0 0.75rem;
font-size: 1.25rem;
}

h4 {
margin: 1.25rem 0 0.5rem;
font-size: 1.05rem;
}

p {
margin: 0 0 1rem;
}

ul,
ol {
margin-top: 0.5rem;
margin-bottom: 1.25rem;
padding-left: 1.4rem;
}

li {
margin: 0.35rem 0;
}

code {
padding: 0.1rem 0.28rem;
background: #EEF4FA;
border: 1px solid var(--cs-border);
border-radius: 4px;
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-size: 0.92em;
}

pre {
overflow-x: auto;
padding: 1rem;
background: #0B1724;
color: #E5EDF5;
border-radius: var(--cs-radius);
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-size: 0.9rem;
line-height: 1.5;
}

/* ---------- Cards ---------- */

.cs-card {
background: var(--cs-white);
border: 1px solid var(--cs-border);
border-radius: var(--cs-radius);
box-shadow: var(--cs-shadow);
padding: 1.75rem;
}

.cs-card + .cs-card {
margin-top: 1.25rem;
}

.cs-card h3:first-child,
.cs-card h2:first-child {
margin-top: 0;
}

.cs-card-muted {
background: #FAFBFC;
box-shadow: none;
}

.cs-grid {
display: grid;
gap: 1.5rem;
}

.cs-grid-2 {
grid-template-columns: repeat(2, minmax(0, 1fr));
}

.cs-grid-3 {
grid-template-columns: repeat(3, minmax(0, 1fr));
}

.cs-info-stack {
display: grid;
gap: 1rem;
margin-top: 1.25rem;
}

.cs-mini-card {
padding: 1rem;
box-shadow: none;
}

.cs-mini-card h3 {
margin-top: 0;
font-size: 1.05rem;
}

.cs-mini-card p {
margin-bottom: 0;
}


/* ---------- Buttons ---------- */

.cs-button,
button.cs-button,
input[type="submit"].cs-button {
display: inline-flex;
align-items: center;
justify-content: center;
min-height: 44px;
padding: 0.75rem 1.1rem;
border: 1px solid transparent;
border-radius: 999px;
background: var(--cs-accent);
color: var(--cs-white);
font: inherit;
font-weight: 700;
cursor: pointer;
text-decoration: none;
transition: background 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
}

.cs-button:hover {
background: var(--cs-accent-dark);
color: var(--cs-white);
text-decoration: none;
transform: translateY(-1px);
}

.cs-button-secondary {
background: var(--cs-white);
color: var(--cs-navy);
border-color: var(--cs-border);
}

.cs-button-secondary:hover {
background: #F9FAFB;
color: var(--cs-navy);
border-color: #CBD5E1;
}

.cs-button-ghost {
background: transparent;
color: var(--cs-accent-dark);
border-color: transparent;
}

.cs-button-ghost:hover {
background: rgba(30, 144, 255, 0.08);
color: var(--cs-accent-dark);
transform: none;
}

/* ---------- Forms ---------- */

.cs-form {
display: grid;
gap: 1rem;
}

.cs-form-row {
display: grid;
grid-template-columns: repeat(2, minmax(0, 1fr));
gap: 1rem;
}

.cs-field {
display: grid;
gap: 0.4rem;
}

.cs-field label {
color: var(--cs-navy);
font-weight: 700;
font-size: 0.95rem;
}

.cs-field input,
.cs-field textarea,
.cs-field select {
width: 100%;
min-height: 44px;
padding: 0.75rem 0.85rem;
border: 1px solid var(--cs-border);
border-radius: var(--cs-radius);
background: var(--cs-white);
color: var(--cs-text);
font: inherit;
}

.cs-field textarea {
min-height: 140px;
resize: vertical;
}

.cs-field input:focus,
.cs-field textarea:focus,
.cs-field select:focus {
outline: 3px solid rgba(30, 144, 255, 0.18);
border-color: var(--cs-accent);
}

.cs-help {
color: var(--cs-muted);
font-size: 0.9rem;
}

.cs-hidden {
display: none !important;
}

/* ---------- File / Proof Utility ---------- */

.cs-proof-panel {
display: grid;
gap: 1.25rem;
}

.cs-file-drop {
display: grid;
place-items: center;
min-height: 180px;
padding: 2rem;
border: 2px dashed #C9D6E2;
border-radius: var(--cs-radius);
background: #FAFCFF;
text-align: center;
transition: border-color 0.15s ease, background 0.15s ease;
}

.cs-file-drop:hover,
.cs-file-drop.dragover {
border-color: var(--cs-accent);
background: rgba(30, 144, 255, 0.06);
}

.cs-file-drop strong {
color: var(--cs-navy);
}

.cs-file-drop p {
margin-bottom: 0;
color: var(--cs-muted);
}

.cs-proof-output {
display: grid;
gap: 0.75rem;
padding: 1rem;
border: 1px solid var(--cs-border);
border-radius: var(--cs-radius);
background: #FAFBFC;
}

.cs-proof-row {
display: grid;
grid-template-columns: 150px 1fr;
gap: 1rem;
align-items: start;
padding: 0.6rem 0;
border-bottom: 1px solid var(--cs-border);
}

.cs-proof-row:last-child {
border-bottom: 0;
}

.cs-proof-label {
color: var(--cs-muted);
font-weight: 700;
font-size: 0.9rem;
}

.cs-proof-value {
overflow-wrap: anywhere;
font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
font-size: 0.9rem;
}

.cs-status {
display: inline-flex;
align-items: center;
width: fit-content;
padding: 0.35rem 0.65rem;
border-radius: 999px;
font-weight: 700;
font-size: 0.85rem;
}

.cs-status-success {
background: rgba(15, 118, 110, 0.12);
color: var(--cs-success);
}

.cs-status-warning {
background: rgba(180, 83, 9, 0.12);
color: var(--cs-warning);
}

.cs-status-danger {
background: rgba(185, 28, 28, 0.12);
color: var(--cs-danger);
}

/* ---------- Notices ---------- */

.cs-notice {
padding: 1rem;
border-left: 4px solid var(--cs-accent);
border-radius: var(--cs-radius);
background: #EEF6FF;
}

.cs-notice p:last-child {
margin-bottom: 0;
}

.cs-notice-warning {
border-left-color: var(--cs-warning);
background: #FFF7ED;
}

.cs-notice-danger {
border-left-color: var(--cs-danger);
background: #FEF2F2;
}

.cs-notice-success {
border-left-color: var(--cs-success);
background: #ECFDF5;
}

/* ---------- Legal / Privacy Note ---------- */

.cs-privacy-note {
padding: 1.25rem;
border: 1px solid rgba(15, 118, 110, 0.25);
border-radius: var(--cs-radius);
background: rgba(15, 118, 110, 0.07);
}

.cs-privacy-note strong {
color: var(--cs-success);
}

/* ---------- Footer ---------- */

.cs-footer {
padding: 2.5rem 0;
background: var(--cs-navy);
color: rgba(255, 255, 255, 0.78);
}

.cs-footer a {
color: #D7EBFF;
}

.cs-footer a:hover {
color: #FFFFFF;
}

.cs-footer-inner {
display: flex;
align-items: flex-start;
justify-content: space-between;
gap: 2rem;
}

.cs-footer-brand {
color: #FFFFFF;
font-weight: 700;
}

.cs-footer-links {
display: flex;
flex-wrap: wrap;
gap: 1rem;
font-size: 0.95rem;
}

.cs-footer-small {
margin-top: 1rem;
color: rgba(255, 255, 255, 0.58);
font-size: 0.9rem;
}

/* ---------- Utility Classes ---------- */

.cs-muted {
color: var(--cs-muted);
}

.cs-center {
text-align: center;
}

.cs-max-readable {
max-width: 720px;
}

.cs-mt-0 {
margin-top: 0;
}

.cs-mb-0 {
margin-bottom: 0;
}

.cs-mt-1 {
margin-top: 1rem;
}

.cs-mt-2 {
margin-top: 2rem;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
.cs-grid-3 {
grid-template-columns: 1fr;
}

.cs-grid-2 {
grid-template-columns: 1fr;
}
}

@media (max-width: 768px) {
.cs-header-inner {
min-height: 64px;
}

.cs-hamburger {
display: block;
}

.cs-nav {
position: absolute;
top: 100%;
left: 0;
right: 0;

```
display: none;
flex-direction: column;
align-items: flex-start;
gap: 1rem;

padding: 1.25rem 1rem 1.5rem;

background: var(--cs-white);
border-bottom: 1px solid var(--cs-border);
box-shadow: var(--cs-shadow);

z-index: 3001;
```

}

.cs-nav.active {
display: flex;
}

.cs-nav a {
width: 100%;
padding: 0.25rem 0;
}

.cs-hero {
padding: 3.5rem 0 3rem;
}

.cs-section {
padding: 3rem 0;
}

.cs-card {
padding: 1.25rem;
}

.cs-form-row {
grid-template-columns: 1fr;
}

.cs-proof-row {
grid-template-columns: 1fr;
gap: 0.25rem;
}

.cs-footer-inner {
flex-direction: column;
}
}

@media (max-width: 480px) {
.cs-container {
width: min(100% - 1.25rem, var(--cs-max-width));
}

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

.cs-button {
width: 100%;
}

pre {
font-size: 0.82rem;
}
}