@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 100 900;
    font-display: swap;
    src: url('../fonts/inter-variable.woff2?v=2a543642') format('woff2');
}

/* --- Global Reset & Box Sizing --- */
*, *::before, *::after {
    box-sizing: border-box;
}

html {
    color-scheme: light dark;
}

/* --- Mathematical Design Tokens & Accessible Palette --- */
:root {
    --bg-color: #ffffff;
    --text-main: #18181b;
    --text-secondary: #71717a;
    --border-color: #e4e4e7;
    --input-bg: #fafafa;
    --primary-color: #ad4c6c; /* Grounded, accessible dusty warm rose */
    --primary-hover: #963a56;
    --focus-ring: rgba(173, 76, 108, 0.3);
    --accent-color: #ad4c6c;
    --accent-hover: #963a56;
    --accent-subtle: #fdf3f6;
    --accent-border: #f5d0dc;
    --focus-ring-accent: rgba(173, 76, 108, 0.25);
    --selection-bg: var(--primary-color);
    --selection-text: #ffffff;
    --btn-text: #ffffff;
    --alert-success-bg: #dcfce7;
    --alert-success-text: #166534;
    --alert-error-bg: #fee2e2;
    --alert-error-text: #991b1b;
    --alert-info-bg: #e0f2fe;
    --alert-info-text: #0369a1;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #18181b;
        --text-main: #f4f4f5; 
        --text-secondary: #a1a1aa; 
        --border-color: #3f3f46;
        --input-bg: #27272a;
        --primary-color: #e89eb2; /* Soft, luminous rose quartz glow */
        --primary-hover: #f0b5c4;
        --focus-ring: rgba(232, 158, 178, 0.3);
        --accent-color: #e89eb2;
        --accent-hover: #f0b5c4;
        --accent-subtle: #2d1b22;
        --accent-border: #52313e;
        --focus-ring-accent: rgba(232, 158, 178, 0.25);
        --selection-bg: var(--primary-color);
        --selection-text: #18181b;
        --btn-text: #18181b; /* High-contrast text on rose quartz */
        --alert-success-bg: #064e3b;
        --alert-success-text: #a7f3d0;
        --alert-error-bg: #7f1d1d;
        --alert-error-text: #fecaca;
        --alert-info-bg: #0c4a6e;
        --alert-info-text: #bae6fd;
    }
}

::selection {
    background-color: var(--selection-bg);
    color: var(--selection-text);
}

/* --- Base Body & Typography --- */
body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    margin: 0;
    padding: clamp(1.5rem, 4vw, 3rem) clamp(1rem, 4vw, 1.5rem);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Optimal reading width (~65-75 characters per line) */
.container {
    max-width: 42rem;
    margin: 0 auto;
    width: 100%;
}

/* --- Header & Fluid Typography --- */
header {
    margin-bottom: clamp(2rem, 5vw, 3rem);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: clamp(1.5rem, 4vw, 2rem);
}

h1 {
    display: flex;
    align-items: center;
    gap: clamp(0.5rem, 1.5vw, 0.75rem);
    font-size: clamp(2rem, 5vw + 0.5rem, 2.75rem);
    font-weight: 800;
    letter-spacing: -0.035em;
    margin: 0 0 0.5rem 0;
    line-height: 1.15;
    text-wrap: balance;
}

.brand-logo {
    width: 0.9em;
    height: 0.9em;
    flex-shrink: 0;
    display: block;
    transform: translateY(-0.035em); /* Optical vertical centering with Inter text */
}

.brand-logo .heart-bg {
    fill: var(--accent-color);
    transition: fill 0.15s ease;
}

.brand-logo .cross-fg {
    fill: #ffffff;
}

@media (prefers-color-scheme: dark) {
    .brand-logo .heart-bg {
        fill: #b85272;
    }
}

h1 .highlight {
    color: var(--primary-color);
}

.lead {
    font-size: clamp(1.0625rem, 1.5vw + 0.75rem, 1.1875rem);
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.55;
    letter-spacing: -0.01em;
    text-wrap: pretty;
}

h2 {
    font-size: clamp(1.25rem, 2vw + 0.5rem, 1.375rem);
    font-weight: 600;
    letter-spacing: -0.02em;
    margin: 0 0 1rem 0;
    line-height: 1.3;
    color: var(--text-main);
    text-wrap: balance;
}

section {
    margin-bottom: clamp(2.25rem, 5vw, 3.25rem);
}

p {
    margin: 0 0 1.25rem 0;
    color: var(--text-secondary);
    line-height: 1.65;
    text-wrap: pretty;
}

p:last-child {
    margin-bottom: 0;
}

ul {
    margin: 0 0 1.25rem 0;
    padding-left: 1.25rem;
    color: var(--text-secondary);
}

li {
    margin-bottom: 0.625rem;
    line-height: 1.6;
}

li:last-child {
    margin-bottom: 0;
}

strong {
    color: var(--text-main);
    font-weight: 600;
}

/* --- Callout Card & Notice --- */
.callout-box {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--primary-color);
    border-radius: 8px;
    padding: clamp(1.125rem, 3vw, 1.5rem);
}

.callout-box-warm,
.callout-box.warm {
    background-color: var(--accent-subtle);
    border-color: var(--accent-border);
    border-left: 4px solid var(--accent-color);
}

.callout-box h2,
.callout-box h3 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    font-size: clamp(1.125rem, 1.5vw + 0.5rem, 1.25rem);
    color: var(--text-main);
}

.callout-box p {
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: 0.875rem;
}

.callout-box p:last-child {
    margin-bottom: 0;
}

/* --- Form Ergonomics & Sizing --- */
.form-group {
    margin-bottom: 1.25rem;
}

label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 0.375rem;
    color: var(--text-main);
    line-height: 1.4;
}

.required {
    color: #ef4444;
}

@media (prefers-color-scheme: dark) {
    .required { color: #f87171; }
}

/* 16px base font-size prevents iOS Safari auto-zoom */
input[type="text"],
input[type="email"],
textarea {
    width: 100%;
    padding: 0.75rem 0.875rem;
    font-family: inherit;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-main);
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input:focus,
textarea:focus {
    outline: 2px solid transparent;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px var(--focus-ring);
}

textarea {
    min-height: 120px;
    resize: vertical;
}

.help-text {
    display: block;
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-top: 0.375rem;
    line-height: 1.4;
}

.privacy-note {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
    line-height: 1.45;
}

/* --- Buttons & Interactive Targets (48px Touch Target) --- */
button,
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    min-height: 48px;
    background-color: var(--primary-color);
    color: var(--btn-text);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
    -webkit-appearance: none;
    text-align: center;
    text-decoration: none;
    line-height: 1.2;
}

button:hover,
.btn:hover {
    background-color: var(--primary-hover);
    text-decoration: none;
}

button:active,
.btn:active {
    transform: scale(0.985);
}

button:focus-visible,
.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn-outline {
    background-color: transparent;
    color: var(--accent-color);
    box-shadow: inset 0 0 0 2px var(--accent-color);
}

.btn-outline:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    box-shadow: inset 0 0 0 2px var(--accent-color);
}

@media (prefers-color-scheme: dark) {
    .btn-outline:hover {
        background-color: var(--accent-color);
        color: #18181b;
        box-shadow: inset 0 0 0 2px var(--accent-color);
    }
}

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

/* --- Footer & Links --- */
footer {
    padding-top: clamp(1.25rem, 3vw, 1.75rem);
    border-top: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-align: center;
    line-height: 1.5;
}

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

a:hover {
    text-decoration: underline;
}

/* --- Alerts --- */
.alert {
    display: none;
    margin-top: 1.25rem;
    padding: 0.875rem 1.25rem;
    border-radius: 6px;
    font-size: 0.9375rem;
    font-weight: 500;
    text-align: center;
    line-height: 1.5;
}

.alert-success {
    background-color: var(--alert-success-bg);
    color: var(--alert-success-text);
}

.alert-info {
    background-color: var(--alert-info-bg);
    color: var(--alert-info-text);
}

.alert-error {
    background-color: var(--alert-error-bg);
    color: var(--alert-error-text);
}