/* =========================================================
   ORALSCAN AI V2 — REGISTER APP DESIGN SYSTEM
   MATCHED TO CANCER APP
   ========================================================= */

:root {

    /* BRAND */
    --color-primary: #2563EB;
    --color-primary-hover: #1D4ED8;
    --color-primary-soft: #EFF6FF;

    --color-teal: #0F766E;
    --color-teal-soft: #F0FDFA;

    --color-navy: #0F172A;
    --color-slate: #334155;

    /* SURFACES */
    --color-page: #F6F8FB;
    --color-surface: #FFFFFF;
    --color-surface-soft: #F8FAFC;
    --color-surface-muted: #F1F5F9;

    /* TEXT */
    --color-text: #0F172A;
    --color-text-secondary: #475569;
    --color-text-muted: #64748B;

    /* BORDERS */
    --color-border: #E2E8F0;
    --color-border-strong: #CBD5E1;

    /* STATUS */
    --color-success: #15803D;
    --color-success-soft: #F0FDF4;

    --color-warning: #B45309;
    --color-warning-soft: #FFFBEB;

    --color-danger: #B91C1C;
    --color-danger-soft: #FEF2F2;

    /* SHADOW */
    --shadow-xs:
        0 1px 2px rgba(15, 23, 42, 0.04);

    --shadow-sm:
        0 4px 14px rgba(15, 23, 42, 0.06);

    --shadow-md:
        0 12px 30px rgba(15, 23, 42, 0.08);

    --shadow-lg:
        0 24px 60px rgba(15, 23, 42, 0.10);

    /* RADIUS */
    --radius-sm: 10px;
    --radius-md: 14px;
    --radius-lg: 18px;
    --radius-xl: 22px;
    --radius-pill: 999px;

    /* LAYOUT */
    --container-width: 1320px;
    --header-height: 76px;

    /* TRANSITION */
    --transition-fast: 160ms ease;
    --transition-normal: 220ms ease;
}



/* =========================================================
   RESET
   ========================================================= */

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    min-height: 100vh;

    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;

    color: var(--color-text);
    background: var(--color-page);

    line-height: 1.55;
    overflow-x: hidden;

    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body::before {
    content: "";

    position: fixed;
    inset: 0;

    pointer-events: none;
    z-index: -2;

    background:
        radial-gradient(
            circle at 8% 0%,
            rgba(37, 99, 235, 0.07),
            transparent 28%
        ),
        radial-gradient(
            circle at 92% 12%,
            rgba(15, 118, 110, 0.05),
            transparent 26%
        );
}



/* =========================================================
   BASE ELEMENTS
   ========================================================= */

a {
    color: inherit;
}

img {
    max-width: 100%;
}

button,
input,
select,
textarea {
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

::selection {
    background: rgba(37, 99, 235, 0.16);
}



/* =========================================================
   APP SHELL
   ========================================================= */

.app-shell {
    min-height: 100vh;

    display: flex;
    flex-direction: column;
}

.app-main {
    flex: 1;
}

.app-content {
    width: min(
        calc(100% - 48px),
        var(--container-width)
    );

    margin: 0 auto;

    padding:
        34px
        0
        56px;
}



/* =========================================================
   HEADER
   ========================================================= */

.app-header {
    position: sticky;
    top: 0;

    z-index: 100;

    border-bottom:
        1px solid
        rgba(226, 232, 240, 0.88);

    background:
        rgba(255, 255, 255, 0.91);

    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

.app-header-inner {
    width: min(
        calc(100% - 48px),
        var(--container-width)
    );

    min-height: var(--header-height);

    margin: 0 auto;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 28px;
}



/* =========================================================
   BRAND
   ========================================================= */

.app-brand {
    display: inline-flex;
    align-items: center;

    gap: 11px;

    text-decoration: none;

    flex-shrink: 0;
}

.brand-mark {
    width: 42px;
    height: 42px;

    display: grid;
    place-items: center;

    border-radius: 13px;

    background: var(--color-primary);
    color: #FFFFFF;

    font-size: 0.88rem;
    font-weight: 800;
    letter-spacing: -0.02em;

    box-shadow:
        0 8px 18px
        rgba(37, 99, 235, 0.18);
}

.brand-copy {
    display: flex;
    align-items: baseline;

    gap: 5px;
}

.brand-name {
    color: var(--color-navy);

    font-size: 1.08rem;
    font-weight: 760;

    letter-spacing: -0.025em;
}

.brand-version {
    color: var(--color-primary);

    font-size: 0.75rem;
    font-weight: 800;

    letter-spacing: 0.02em;
}



/* =========================================================
   REGISTER HEADER STATUS
   ========================================================= */

.auth-header-copy {
    display: flex;
    align-items: center;

    gap: 10px;
}

.auth-header-label {
    color: var(--color-text-muted);

    font-size: 0.82rem;
    font-weight: 600;
}

.auth-header-status {
    display: inline-flex;
    align-items: center;
    justify-content: center;

    min-height: 32px;

    padding:
        0
        11px;

    border:
        1px solid
        rgba(37, 99, 235, 0.12);

    border-radius:
        var(--radius-pill);

    background:
        var(--color-primary-soft);

    color:
        var(--color-primary);

    font-size: 0.75rem;
    font-weight: 750;
}



/* =========================================================
   GENERIC SURFACES
   ========================================================= */

.glass-card {
    border:
        1px solid
        var(--color-border);

    border-radius:
        var(--radius-xl);

    background:
        var(--color-surface);

    box-shadow:
        var(--shadow-sm);

    padding: 24px;

    transition:
        border-color var(--transition-normal),
        box-shadow var(--transition-normal);
}

.glass-card:hover {
    border-color:
        var(--color-border-strong);

    box-shadow:
        var(--shadow-md);
}



/* =========================================================
   TYPOGRAPHY
   ========================================================= */

h1,
h2,
h3,
h4,
h5,
h6 {
    color:
        var(--color-navy);

    line-height: 1.2;
    letter-spacing: -0.025em;
}

h1 {
    font-size:
        clamp(
            1.75rem,
            3vw,
            2.4rem
        );
}

h2 {
    font-size:
        clamp(
            1.3rem,
            2vw,
            1.7rem
        );
}

h3 {
    font-size: 1.08rem;
}

p {
    color:
        var(--color-text-secondary);
}



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

.btn {
    min-height: 44px;

    display: inline-flex;
    align-items: center;
    justify-content: center;

    gap: 8px;

    padding:
        0
        18px;

    border:
        1px solid
        transparent;

    border-radius: 12px;

    text-decoration: none;

    font-size: 0.92rem;
    font-weight: 700;

    cursor: pointer;

    transition:
        transform var(--transition-fast),
        background var(--transition-fast),
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

.btn:hover {
    transform:
        translateY(-1px);
}

.btn:active {
    transform:
        translateY(0);
}

.btn:focus-visible {
    outline:
        3px solid
        rgba(37, 99, 235, 0.18);

    outline-offset: 2px;
}

.btn-primary {
    color: #FFFFFF;
    background:
        var(--color-primary);

    box-shadow:
        0 6px 14px
        rgba(37, 99, 235, 0.16);
}

.btn-primary:hover {
    background:
        var(--color-primary-hover);

    box-shadow:
        0 10px 20px
        rgba(37, 99, 235, 0.20);
}

.btn-secondary {
    color:
        var(--color-teal);

    background:
        var(--color-teal-soft);

    border-color:
        rgba(15, 118, 110, 0.14);
}

.btn-secondary:hover {
    background:
        #CCFBF1;
}

.btn-outline {
    color:
        var(--color-text);

    background:
        #FFFFFF;

    border-color:
        var(--color-border);
}

.btn-outline:hover {
    border-color:
        var(--color-border-strong);

    background:
        var(--color-surface-soft);
}



/* =========================================================
   FORM BASICS
   ========================================================= */

.form-control,
input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
select,
textarea {
    width: 100%;

    border:
        1px solid
        var(--color-border-strong);

    border-radius: 12px;

    background: #FFFFFF;

    color:
        var(--color-text);

    transition:
        border-color var(--transition-fast),
        box-shadow var(--transition-fast);
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="tel"],
input[type="number"],
select {
    min-height: 46px;

    padding:
        0
        13px;
}

textarea {
    padding:
        12px
        13px;
}

input:focus,
select:focus,
textarea:focus {
    outline: none;

    border-color:
        var(--color-primary);

    box-shadow:
        0 0 0 3px
        rgba(37, 99, 235, 0.10);
}

input::placeholder,
textarea::placeholder {
    color:
        #94A3B8;
}



/* =========================================================
   STATUS UTILITIES
   ========================================================= */

.status-success {
    color:
        var(--color-success);

    background:
        var(--color-success-soft);
}

.status-warning {
    color:
        var(--color-warning);

    background:
        var(--color-warning-soft);
}

.status-danger {
    color:
        var(--color-danger);

    background:
        var(--color-danger-soft);
}



/* =========================================================
   FOOTER
   ========================================================= */

.app-footer {
    border-top:
        1px solid
        var(--color-border);

    background:
        rgba(255, 255, 255, 0.75);
}

.app-footer-inner {
    width: min(
        calc(100% - 48px),
        var(--container-width)
    );

    margin: 0 auto;

    padding:
        24px
        0;

    display: flex;
    align-items: center;
    justify-content: space-between;

    gap: 24px;
}

.footer-brand {
    display: flex;
    flex-direction: column;

    gap: 3px;
}

.footer-logo {
    color:
        var(--color-navy);

    font-size: 0.92rem;
    font-weight: 750;
}

.footer-description {
    color:
        var(--color-text-muted);

    font-size: 0.76rem;
}

.footer-meta {
    display: flex;
    align-items: center;

    gap: 8px;

    color:
        var(--color-text-muted);

    font-size: 0.76rem;
}

.footer-dot {
    opacity: 0.45;
}



/* =========================================================
   ANIMATION
   ========================================================= */

@keyframes fadeUp {

    from {
        opacity: 0;
        transform:
            translateY(8px);
    }

    to {
        opacity: 1;
        transform:
            translateY(0);
    }

}

.fade-up {
    animation:
        fadeUp
        280ms
        ease
        both;
}



/* =========================================================
   ACCESSIBILITY
   ========================================================= */

@media (prefers-reduced-motion: reduce) {

    *,
    *::before,
    *::after {
        scroll-behavior: auto !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

}