/* ============================================
   COLLABORATIVE CANVAS DESIGN SYSTEM
   ============================================ */

/* ---- Design Tokens ---- */
:root {
    /* Colors - Primary */
    --color-primary: #0b50d5;
    --color-primary-container: #7d9cff;
    --color-on-primary: #ffffff;

    /* Colors - Secondary */
    --color-secondary: #964300;
    --color-secondary-container: #ffc5a6;
    --color-on-secondary-container: #773400;
    --color-secondary-fixed: #ffc5a6;

    /* Colors - Tertiary */
    --color-tertiary: #006a77;
    --color-tertiary-container: #53ddfc;

    /* Colors - Surface Hierarchy */
    --color-surface: #f8f5ff;
    --color-surface-container-low: #f1efff;
    --color-surface-container-lowest: #ffffff;
    --color-surface-container: #e7e6ff;
    --color-surface-container-high: #e0e0ff;
    --color-surface-container-highest: #dadaff;

    /* Colors - On Surface */
    --color-on-surface: #292b51;
    --color-on-surface-variant: #565881;
    --color-outline-variant: #a8a9d7;

    /* Typography */
    --font-display: 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Be Vietnam Pro', sans-serif;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-6: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;

    /* Radii */
    --radius-sm: 0.5rem;
    --radius-md: 1.5rem;
    --radius-lg: 2rem;
    --radius-xl: 3rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-ambient: 0px 12px 32px rgba(41, 43, 81, 0.06);
    --shadow-elevated: 0px 4px 16px rgba(41, 43, 81, 0.12);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-container) 100%);
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
    min-height: 100vh;
    background-color: var(--color-surface);
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ---- Typography ---- */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    color: var(--color-on-surface);
    margin-top: 0;
}

h1:focus, h2:focus, h3:focus {
    outline: none;
}

.display-lg {
    font-family: var(--font-display);
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.02em;
    color: var(--color-on-surface);
}

.display-md {
    font-family: var(--font-display);
    font-size: 2.75rem;
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.01em;
    color: var(--color-on-surface);
}

.headline-lg {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.25;
    color: var(--color-on-surface);
}

.headline-md {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-on-surface);
}

.headline-sm {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    line-height: 1.4;
    color: var(--color-on-surface);
}

.body-md {
    font-family: var(--font-body);
    font-size: 1rem;
    color: var(--color-on-surface-variant);
}

.label-sm {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-on-surface-variant);
    letter-spacing: 0.02em;
}

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

a:hover {
    text-decoration: underline;
}

/* ---- Buttons ---- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    background: var(--gradient-primary);
    color: var(--color-on-primary);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: box-shadow 0.2s ease, transform 0.1s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary:hover {
    box-shadow: var(--shadow-elevated);
    transform: translateY(-1px);
    color: var(--color-on-primary);
    text-decoration: none;
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: none;
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    background: var(--color-secondary-container);
    color: var(--color-on-secondary-container);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: box-shadow 0.2s ease, transform 0.1s ease;
    text-decoration: none;
    white-space: nowrap;
}

.btn-secondary:hover {
    box-shadow: var(--shadow-ambient);
    transform: translateY(-1px);
    color: var(--color-on-secondary-container);
    text-decoration: none;
}

.btn-ghost {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-primary);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: background 0.2s ease;
    text-decoration: none;
}

.btn-ghost:hover {
    background: var(--color-surface-container-high);
    color: var(--color-primary);
    text-decoration: none;
}

/* ---- Cards ---- */
.card {
    background: var(--color-surface-container-lowest);
    border-radius: var(--radius-lg);
    padding: var(--spacing-6);
    box-shadow: var(--shadow-ambient);
    overflow: hidden;
}

.card-xl {
    border-radius: var(--radius-xl);
}

.card-footer {
    margin: calc(-1 * var(--spacing-6));
    margin-top: var(--spacing-4);
    padding: var(--spacing-4) var(--spacing-6);
    background: var(--color-surface-container-low);
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
}

/* ---- Input Fields ---- */
.form-input {
    width: 100%;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-full);
    background: var(--color-surface-container-highest);
    border: 2px solid transparent;
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: background 0.2s ease, border-color 0.2s ease;
    outline: none;
}

.form-input::placeholder {
    color: var(--color-on-surface-variant);
}

.form-input:focus {
    background: var(--color-surface-container-lowest);
    border-color: var(--color-primary);
}

.form-textarea {
    width: 100%;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-md);
    background: var(--color-surface-container-highest);
    border: 2px solid transparent;
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: background 0.2s ease, border-color 0.2s ease;
    outline: none;
    resize: vertical;
    min-height: 6rem;
}

.form-textarea:focus {
    background: var(--color-surface-container-lowest);
    border-color: var(--color-primary);
}

.form-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-on-surface-variant);
    margin-bottom: 0.375rem;
    padding-left: 0.25rem;
}

/* ---- Activity Chips ---- */
.chip {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-1);
    padding: 0.375rem 0.875rem;
    border-radius: var(--radius-full);
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 600;
    white-space: nowrap;
}

.chip-active {
    background: var(--color-secondary-fixed);
    color: var(--color-on-secondary-container);
}

.chip-tentative {
    background: var(--color-tertiary-container);
    color: var(--color-tertiary);
}

.chip-neutral {
    background: var(--color-surface-container);
    color: var(--color-on-surface-variant);
}

/* ---- Collaborator Stack ---- */
.collaborator-stack {
    display: flex;
    align-items: center;
}

.collaborator-avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: var(--color-primary-container);
    color: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 700;
    margin-left: -0.5rem;
    box-shadow: 0 0 0 2px var(--color-surface-container-lowest);
    position: relative;
}

.collaborator-avatar:first-child {
    margin-left: 0;
}

.collaborator-avatar:nth-child(2) { background: var(--color-secondary-container); color: var(--color-on-secondary-container); }
.collaborator-avatar:nth-child(3) { background: var(--color-tertiary-container); color: var(--color-tertiary); }
.collaborator-avatar:nth-child(4) { background: var(--color-surface-container-high); color: var(--color-on-surface); }

.collaborator-count {
    font-size: 0.7rem;
    color: var(--color-on-surface-variant);
    margin-left: 0.5rem;
    font-family: var(--font-body);
    font-weight: 500;
}

/* ---- Section spacing ---- */
.section {
    margin-bottom: var(--spacing-10);
}

.section-lg {
    margin-bottom: var(--spacing-12);
}

/* ---- Grid layouts ---- */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: var(--spacing-6);
}

/* ---- Validation ---- */
.valid.modified:not([type=checkbox]) {
    outline: 2px solid #26b050;
    outline-offset: -2px;
}

.invalid {
    outline: 2px solid #e50000;
    outline-offset: -2px;
}

.validation-message {
    color: #e50000;
    font-size: 0.8125rem;
    margin-top: 0.25rem;
    padding-left: 0.25rem;
}

/* ---- Error boundary ---- */
.blazor-error-boundary {
    background: #fef2f2;
    border-radius: var(--radius-sm);
    padding: 1rem 1rem 1rem 3.7rem;
    color: #b32121;
    background-image: url(data:image/svg+xml;base64,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);
    background-repeat: no-repeat;
    background-position: 1rem center;
    background-size: 1.8rem;
}

.blazor-error-boundary::after {
    content: "An error has occurred.";
}

/* ---- Auth Pages (Login / Register) ---- */
.auth-page h1 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-on-surface);
    margin-bottom: 0.375rem;
}

.auth-page-subtitle {
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--color-on-surface-variant);
    margin-bottom: 2rem;
}

.auth-error {
    background: #fef2f2;
    color: #b32121;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

.auth-errors {
    background: #fef2f2;
    color: #b32121;
    border-radius: var(--radius-sm);
    padding: 0.75rem 1rem 0.75rem 1.75rem;
    font-size: 0.875rem;
    margin-bottom: 1.25rem;
}

.form-field {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    margin-bottom: 1rem;
}

.form-field label {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-on-surface-variant);
    padding-left: 0.25rem;
}

.form-field input {
    width: 100%;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-full);
    background: var(--color-surface-container-high);
    border: 2px solid transparent;
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: background 0.2s ease, border-color 0.2s ease;
    outline: none;
}

.form-field input:focus {
    background: var(--color-surface-container-lowest);
    border-color: var(--color-primary);
}

.auth-page .btn-primary {
    width: 100%;
    margin-top: 0.5rem;
    margin-bottom: 1.5rem;
    padding: 0.875rem 1.75rem;
}

.auth-divider {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
    color: var(--color-on-surface-variant);
    font-size: 0.8125rem;
}

.auth-divider::before,
.auth-divider::after {
    content: "";
    flex: 1;
    height: 1px;
    background: var(--color-surface-container-high);
}

.auth-social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.625rem;
    width: 100%;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-full);
    background: var(--color-surface-container-lowest);
    border: 1.5px solid var(--color-surface-container-highest);
    color: var(--color-on-surface);
    font-family: var(--font-body);
    font-size: 0.9375rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: box-shadow 0.2s ease, border-color 0.2s ease;
    margin-bottom: 0.75rem;
}

.auth-social-btn:hover {
    box-shadow: var(--shadow-ambient);
    border-color: var(--color-outline-variant);
    color: var(--color-on-surface);
    text-decoration: none;
}

.auth-footer-link {
    text-align: center;
    font-size: 0.875rem;
    color: var(--color-on-surface-variant);
    margin-top: 1rem;
}

.auth-footer-link a {
    color: var(--color-primary);
    font-weight: 600;
}

/* ---- Landing page (unauthenticated home) ---- */
.landing-page {
    max-width: 900px;
}

.landing-hero {
    padding: 3rem 0 4rem;
    text-align: center;
}

.landing-hero h1 {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 800;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: var(--color-on-surface);
    margin-bottom: 1.25rem;
}

.landing-hero p {
    font-size: 1.125rem;
    color: var(--color-on-surface-variant);
    max-width: 560px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.landing-hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.landing-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 4rem;
}

.landing-feature-card {
    background: var(--color-surface-container-lowest);
    border-radius: var(--radius-lg);
    padding: 1.75rem;
    box-shadow: var(--shadow-ambient);
}

.landing-feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.landing-feature-card h3 {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--color-on-surface);
    margin-bottom: 0.5rem;
}

.landing-feature-card p {
    font-size: 0.9375rem;
    color: var(--color-on-surface-variant);
    line-height: 1.6;
    margin: 0;
}