:root {
    --app-primary: #6255d9;
    --app-primary-dark: #5144c4;
    --app-primary-soft: rgba(98, 85, 217, 0.12);
    --app-surface: #ffffff;
    --app-surface-muted: #f6f7fb;
    --app-border: rgba(32, 31, 52, 0.1);
    --app-shadow: 0 18px 50px rgba(43, 38, 94, 0.09);
    --app-shadow-soft: 0 8px 24px rgba(43, 38, 94, 0.07);
    --app-radius: 1.25rem;
}

[data-bs-theme="dark"] {
    --app-primary: #9a8fff;
    --app-primary-dark: #b0a8ff;
    --app-primary-soft: rgba(154, 143, 255, 0.14);
    --app-surface: #1c1d25;
    --app-surface-muted: #15161d;
    --app-border: rgba(255, 255, 255, 0.1);
    --app-shadow: 0 18px 50px rgba(0, 0, 0, 0.24);
    --app-shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.18);
}

html {
    scroll-behavior: smooth;
}

body {
    background: var(--app-surface-muted);
    color: var(--bs-body-color);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a,
.btn,
.form-control,
.form-select {
    transition: color 160ms ease, background-color 160ms ease, border-color 160ms ease,
    box-shadow 160ms ease, transform 160ms ease;
}

.btn-primary {
    --bs-btn-bg: var(--app-primary);
    --bs-btn-border-color: var(--app-primary);
    --bs-btn-hover-bg: var(--app-primary-dark);
    --bs-btn-hover-border-color: var(--app-primary-dark);
    --bs-btn-active-bg: var(--app-primary-dark);
    --bs-btn-active-border-color: var(--app-primary-dark);
    font-weight: 650;
}

.btn-outline-primary {
    --bs-btn-color: var(--app-primary);
    --bs-btn-border-color: var(--app-primary);
    --bs-btn-hover-bg: var(--app-primary);
    --bs-btn-hover-border-color: var(--app-primary);
}

.link-primary {
    color: var(--app-primary) !important;
}

.form-control:focus,
.form-select:focus {
    border-color: var(--app-primary);
    box-shadow: 0 0 0 0.22rem var(--app-primary-soft);
}

.app-navbar {
    background: color-mix(in srgb, var(--app-surface) 88%, transparent);
    border-bottom: 1px solid var(--app-border);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.navbar-brand {
    color: var(--bs-body-color);
    font-weight: 750;
    letter-spacing: -0.025em;
}

.brand-mark {
    display: inline-grid;
    width: 2.25rem;
    height: 2.25rem;
    place-items: center;
    color: #fff;
    background: linear-gradient(140deg, #7467e8, #5043bd);
    border-radius: 0.75rem;
    box-shadow: 0 7px 18px rgba(98, 85, 217, 0.3);
}

.app-navbar .nav-link {
    color: var(--bs-secondary-color);
    font-size: 0.94rem;
    font-weight: 550;
    border-radius: 0.7rem;
    padding: 0.55rem 0.75rem !important;
}

.app-navbar .nav-link:hover,
.app-navbar .nav-link:focus-visible {
    color: var(--bs-body-color);
    background: var(--app-primary-soft);
}

.nav-user {
    padding: 0.3rem 0.45rem;
}

.avatar-sm {
    display: inline-grid;
    width: 1.9rem;
    height: 1.9rem;
    place-items: center;
    color: var(--app-primary);
    background: var(--app-primary-soft);
    border-radius: 50%;
}

.dropdown-menu {
    border: 1px solid var(--app-border);
    border-radius: 0.9rem;
    box-shadow: var(--app-shadow-soft);
    padding: 0.5rem;
}

.dropdown-item {
    border-radius: 0.55rem;
}

.theme-option.active {
    color: var(--app-primary);
    background: var(--app-primary-soft);
}

.app-footer {
    border-top: 1px solid var(--app-border);
    background: color-mix(in srgb, var(--app-surface) 70%, transparent);
}

.flash-container {
    position: fixed;
    z-index: 1080;
    top: 5.25rem;
    right: 0;
    left: 0;
    pointer-events: none;
}

.flash-container .alert {
    width: fit-content;
    max-width: min(90vw, 34rem);
    margin-left: auto;
    pointer-events: auto;
    border: 0;
    border-radius: 0.9rem;
}

/* Landing */
.landing-page {
    background:
            radial-gradient(circle at 10% 15%, rgba(116, 103, 232, 0.08), transparent 28rem),
            var(--app-surface-muted);
}

.hero-section {
    position: relative;
    overflow: hidden;
    padding: clamp(2.5rem, 7vw, 6.5rem) 0 4rem;
}

.hero-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(2px);
    pointer-events: none;
}

.hero-orb-one {
    width: 22rem;
    height: 22rem;
    right: -8rem;
    top: -7rem;
    background: rgba(98, 85, 217, 0.1);
}

.hero-orb-two {
    width: 13rem;
    height: 13rem;
    left: 43%;
    bottom: 0;
    background: rgba(46, 184, 160, 0.08);
}

.hero-copy {
    max-width: 40rem;
}

.hero-copy h1 {
    letter-spacing: -0.055em;
    line-height: 1.03;
}

.eyebrow {
    display: inline-flex;
    align-items: center;
    color: var(--app-primary);
    background: var(--app-primary-soft);
    border: 1px solid color-mix(in srgb, var(--app-primary) 24%, transparent);
    border-radius: 999px;
    padding: 0.55rem 0.9rem;
    font-size: 0.82rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

.eyebrow-compact {
    padding: 0.4rem 0.7rem;
    font-size: 0.72rem;
}

.hero-preview-wrap {
    position: relative;
    max-width: 31rem;
    margin-inline: auto;
    padding: 2rem;
}

.preview-glow {
    position: absolute;
    inset: 10% 5%;
    background: linear-gradient(135deg, rgba(98, 85, 217, 0.38), rgba(46, 184, 160, 0.18));
    border-radius: 3rem;
    filter: blur(45px);
}

.hero-note-card {
    position: relative;
    min-height: 25rem;
    padding: clamp(1.7rem, 4vw, 2.5rem);
    background: color-mix(in srgb, var(--app-surface) 94%, transparent);
    border: 1px solid color-mix(in srgb, var(--app-primary) 18%, var(--app-border));
    border-radius: 1.8rem;
    box-shadow: 0 35px 80px rgba(43, 38, 94, 0.2);
    transform: rotate(2deg);
}

.pin-bubble {
    display: inline-grid;
    width: 2.5rem;
    height: 2.5rem;
    place-items: center;
    color: var(--app-primary);
    background: var(--app-primary-soft);
    border-radius: 50%;
}

.preview-lines {
    display: flex;
    gap: 0.3rem;
}

.preview-lines span {
    display: block;
    width: 0.4rem;
    height: 0.4rem;
    background: var(--app-primary);
    border-radius: 50%;
    opacity: 0.5;
}

.feature-card {
    padding: 1.75rem;
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow-soft);
}

.feature-icon,
.auth-icon,
.empty-icon,
.error-icon {
    display: inline-grid;
    width: 3rem;
    height: 3rem;
    place-items: center;
    color: var(--app-primary);
    background: var(--app-primary-soft);
    border-radius: 0.95rem;
    font-size: 1.35rem;
}

/* Authentication */
.auth-page {
    background:
            radial-gradient(circle at 50% 20%, rgba(98, 85, 217, 0.09), transparent 32rem),
            var(--app-surface-muted);
}

.auth-shell {
    width: 100%;
    max-width: 31rem;
}

.auth-shell-wide {
    max-width: 38rem;
}

.auth-card,
.note-form-card,
.note-detail-card,
.filter-panel {
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow);
}

.auth-card {
    padding: clamp(1.5rem, 5vw, 2.25rem);
}

.auth-card .input-group-text {
    color: var(--bs-secondary-color);
    background: transparent;
}

.auth-card .input-group:focus-within .input-group-text {
    color: var(--app-primary);
    border-color: var(--app-primary);
}

/* Notes list */
.filter-panel {
    padding: 1rem;
    box-shadow: var(--app-shadow-soft);
}

.search-control {
    position: relative;
}

.search-control > .bi-search {
    position: absolute;
    z-index: 2;
    left: 1rem;
    top: 50%;
    color: var(--bs-secondary-color);
    transform: translateY(-50%);
    pointer-events: none;
}

.search-control .form-control {
    padding-left: 2.75rem;
    padding-right: 2.75rem;
}

.search-control .spinner-border {
    position: absolute;
    z-index: 2;
    right: 1rem;
    top: calc(50% - 0.5rem);
    color: var(--app-primary);
}

.note-card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 18.5rem;
    padding: 1.35rem;
    overflow: hidden;
    background: var(--app-surface);
    border: 1px solid var(--app-border);
    border-radius: var(--app-radius);
    box-shadow: var(--app-shadow-soft);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.note-card::before {
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    height: 3px;
    content: "";
    background: transparent;
}

.note-card-pinned::before {
    background: linear-gradient(90deg, var(--app-primary), #37bda5);
}

.note-card:hover {
    border-color: color-mix(in srgb, var(--app-primary) 25%, var(--app-border));
    box-shadow: var(--app-shadow);
    transform: translateY(-3px);
}

.category-badge,
.pinned-label {
    display: inline-flex;
    align-items: center;
    width: fit-content;
    padding: 0.38rem 0.68rem;
    border-radius: 999px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.category-personal {
    color: #c34572;
    background: rgba(224, 82, 131, 0.12);
}

.category-work {
    color: #3974cd;
    background: rgba(57, 116, 205, 0.12);
}

.category-study {
    color: #6d56d9;
    background: rgba(109, 86, 217, 0.12);
}

.category-idea {
    color: #a66a0a;
    background: rgba(226, 159, 37, 0.15);
}

.category-other {
    color: #5d6a72;
    background: rgba(105, 119, 128, 0.13);
}

[data-bs-theme="dark"] .category-personal {
    color: #ff91b7;
}

[data-bs-theme="dark"] .category-work {
    color: #8ab8ff;
}

[data-bs-theme="dark"] .category-study {
    color: #b0a3ff;
}

[data-bs-theme="dark"] .category-idea {
    color: #ffd27b;
}

[data-bs-theme="dark"] .category-other {
    color: #bdc7ce;
}

.pin-button {
    display: inline-grid;
    width: 2.25rem;
    height: 2.25rem;
    place-items: center;
    color: var(--bs-secondary-color);
    background: transparent;
    border: 0;
    border-radius: 50%;
}

.pin-button:hover,
.pin-button.active {
    color: var(--app-primary);
    background: var(--app-primary-soft);
}

.note-card-body {
    flex: 1;
    padding: 1.25rem 0;
}

.note-card-title a {
    color: var(--bs-body-color);
    text-decoration: none;
}

.note-card-title a:hover {
    color: var(--app-primary);
}

.note-card-preview {
    display: -webkit-box;
    margin: 0.75rem 0 0;
    overflow: hidden;
    color: var(--bs-secondary-color);
    line-height: 1.65;
    white-space: pre-line;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 4;
}

.note-card-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding-top: 1rem;
    border-top: 1px solid var(--app-border);
}

.note-actions {
    display: flex;
    gap: 0.1rem;
}

.btn-quiet {
    color: var(--bs-secondary-color);
    background: transparent;
    border: 0;
}

.btn-quiet:hover {
    color: var(--app-primary);
    background: var(--app-primary-soft);
}

.empty-state {
    padding: 5rem 1rem;
}

.empty-state p {
    max-width: 31rem;
}

.empty-icon {
    width: 4.2rem;
    height: 4.2rem;
    border-radius: 1.3rem;
    font-size: 1.8rem;
}

.loading-indicator {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.7rem;
    padding: 2rem;
    color: var(--bs-secondary-color);
}

.scroll-sentinel {
    height: 1px;
}

/* Note form and detail */
.form-shell,
.detail-shell {
    max-width: 53rem;
}

.back-link {
    display: inline-flex;
    align-items: center;
    color: var(--bs-secondary-color);
    font-weight: 600;
    text-decoration: none;
}

.back-link:hover {
    color: var(--app-primary);
}

.note-form-card,
.note-detail-card {
    padding: clamp(1.35rem, 4vw, 2.5rem);
}

.note-content-input {
    min-height: 18rem;
    line-height: 1.7;
    resize: vertical;
}

.detail-title {
    margin-bottom: 2rem;
    font-size: clamp(2rem, 5vw, 3.2rem);
    font-weight: 750;
    letter-spacing: -0.045em;
    line-height: 1.12;
    overflow-wrap: anywhere;
}

.detail-content {
    min-height: 13rem;
    font-size: 1.06rem;
    line-height: 1.85;
    overflow-wrap: anywhere;
    white-space: pre-wrap;
}

.pinned-label {
    color: var(--app-primary);
    background: var(--app-primary-soft);
}

.detail-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin-top: 3rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--app-border);
    color: var(--bs-secondary-color);
    font-size: 0.88rem;
}

.detail-meta > div {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.meta-label {
    color: var(--bs-tertiary-color);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.modal-content {
    background: var(--app-surface);
}

.modal-icon-danger {
    display: inline-grid;
    width: 2.8rem;
    height: 2.8rem;
    place-items: center;
    color: var(--bs-danger);
    background: rgba(var(--bs-danger-rgb), 0.12);
    border-radius: 0.85rem;
}

/* Errors */
.error-page {
    background:
            radial-gradient(circle at 50% 35%, rgba(98, 85, 217, 0.1), transparent 24rem),
            var(--app-surface-muted);
}

.error-code {
    color: var(--app-primary-soft);
    font-size: clamp(5rem, 18vw, 10rem);
    font-weight: 850;
    letter-spacing: -0.08em;
    line-height: 0.8;
}

.error-icon {
    width: 4rem;
    height: 4rem;
    margin-top: -1rem;
    border-radius: 1.2rem;
    font-size: 1.7rem;
}

.error-copy {
    max-width: 34rem;
    margin-bottom: 1.75rem;
}

@media (max-width: 991.98px) {
    .app-navbar .navbar-collapse {
        max-height: calc(100vh - 5rem);
        overflow-y: auto;
    }

    .nav-user {
        margin-block: 0.3rem;
    }

    .hero-note-card {
        transform: rotate(1deg);
    }
}

@media (max-width: 575.98px) {
    .hero-section {
        padding-top: 2rem;
    }

    .hero-copy h1 {
        font-size: 2.65rem;
    }

    .hero-preview-wrap {
        padding: 0.6rem;
    }

    .hero-note-card {
        min-height: 22rem;
    }

    .filter-panel {
        padding: 0.85rem;
    }

    .note-card-footer {
        align-items: flex-end;
    }

    .note-card-footer .small {
        max-width: 10rem;
    }

    .detail-shell > .d-flex:first-child {
        align-items: stretch !important;
    }

    .detail-shell > .d-flex:first-child > .d-flex {
        width: 100%;
        overflow-x: auto;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        transition-duration: 0.01ms !important;
    }
}