/* ---------------------------------------------------------------------------
   Opterite — login screen
   Presentation only. Every selector the markup and /js/login.js depend on is
   preserved (.alert/.alert-error/.alert-success, .loading, .blob-1/.blob-2,
   the #submitBtn span + i pair, etc.), so behaviour is unchanged.
   --------------------------------------------------------------------------- */

:root {
    /* Brand ramp, aligned with the Opterite logo */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-accent: #8b5cf6;
    --primary-light: #eef0ff;
    --primary-ring: rgba(99, 102, 241, 0.16);

    --success-color: #16a34a;
    --error-color: #dc2626;

    --bg-color: #f4f5fa;
    --card-bg: #ffffff;

    --text-main: #16182b;
    --text-body: #3f4258;
    --text-muted: #757a92;

    --border-color: #e4e6f0;
    --border-strong: #d2d5e4;

    --radius-xl: 22px;
    --radius-lg: 14px;
    --radius-md: 12px;
    --radius-sm: 10px;

    --shadow-card:
        0 1px 2px rgba(22, 24, 43, 0.04),
        0 12px 24px -12px rgba(22, 24, 43, 0.12),
        0 36px 64px -32px rgba(79, 70, 229, 0.18);
    --shadow-btn: 0 8px 20px -6px rgba(79, 70, 229, 0.5);
    --shadow-btn-hover: 0 12px 26px -6px rgba(79, 70, 229, 0.55);

    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-body);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 32px 16px;
    position: relative;
    background-color: var(--bg-color);
    background-image:
        radial-gradient(1100px 620px at 12% -12%, rgba(99, 102, 241, 0.18), transparent 62%),
        radial-gradient(900px 560px at 104% 112%, rgba(139, 92, 246, 0.16), transparent 62%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

/* ------------------------------------------------------------------ Backdrop */

/* Sits above the body background but below the card, so the blobs are
   actually visible (previously z-index:-1 painted them out of sight). */
.bg-decoration {
    position: fixed;
    inset: 0;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(90px);
    opacity: 0.55;
    /* Transform only: /js/login.js writes an inline transform on mousemove. */
    transition: transform 0.9s cubic-bezier(0.22, 1, 0.36, 1);
    will-change: transform;
}

.blob-1 {
    width: 460px;
    height: 460px;
    background: radial-gradient(circle at 30% 30%, #c7d2fe, #a5b4fc 55%, rgba(165, 180, 252, 0) 72%);
    top: -160px;
    right: -120px;
    animation: move 22s infinite alternate ease-in-out;
}

.blob-2 {
    width: 380px;
    height: 380px;
    background: radial-gradient(circle at 65% 35%, #ddd6fe, #c4b5fd 55%, rgba(196, 181, 253, 0) 72%);
    bottom: -140px;
    left: -110px;
    animation: move 17s infinite alternate-reverse ease-in-out;
}

@keyframes move {
    from {
        transform: translate(0, 0);
    }

    to {
        transform: translate(50px, 50px);
    }
}

/* --------------------------------------------------------------------- Shell */

.auth-wrapper {
    width: 100%;
    max-width: 480px;
    position: relative;
    z-index: 10;
}

.auth-card {
    position: relative;
    overflow: hidden;
    background-color: var(--card-bg);
    border: 1px solid rgba(228, 230, 240, 0.9);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-card);
    padding: 40px 38px 32px;
    animation: cardIn 0.5s cubic-bezier(0.22, 1, 0.36, 1) both;
}

/* Brand hairline across the top edge */
.auth-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-dark), var(--primary-accent) 55%, #c4b5fd);
}

@keyframes cardIn {
    from {
        opacity: 0;
        transform: translateY(14px) scale(0.99);
    }

    to {
        opacity: 1;
        transform: none;
    }
}

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

.auth-header {
    text-align: center;
    margin-bottom: 30px;
}

.logo-box {
    position: relative;
    width: 72px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 18px;
}

/* Soft brand halo behind the mark */
.logo-box::after {
    content: '';
    position: absolute;
    inset: -14px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.22), transparent 68%);
    z-index: 0;
}

.logo-mark {
    position: relative;
    z-index: 1;
    width: 72px;
    height: 72px;
    display: block;
    border-radius: 50%;
    box-shadow: 0 10px 22px -8px rgba(79, 70, 229, 0.55);
}

.auth-header h1 {
    font-size: 27px;
    line-height: 1.2;
    font-weight: 700;
    letter-spacing: -0.025em;
    margin-bottom: 10px;
    color: var(--text-main);
}

.auth-header p {
    color: var(--text-muted);
    margin: 0 auto;
    max-width: 344px;
    font-size: 13.5px;
    line-height: 1.6;
}

/* -------------------------------------------------------------------- Alerts */

.alert {
    border-radius: var(--radius-md);
    padding: 13px 16px;
    margin-bottom: 22px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13.5px;
    line-height: 1.5;
    animation: slideDown 0.3s ease-out;
    position: relative;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.alert i:first-child {
    font-size: 17px;
    flex-shrink: 0;
}

.alert span {
    flex: 1;
    line-height: 1.5;
}

.alert .close-btn {
    background: none;
    border: none;
    cursor: pointer;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--transition);
    flex-shrink: 0;
    opacity: 0.6;
}

.alert .close-btn:hover {
    opacity: 1;
}

.alert .close-btn i {
    font-size: 13px;
}

.alert-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-left: 3px solid var(--error-color);
    color: #911b1b;
}

.alert-error i:first-child {
    color: var(--error-color);
}

.alert-error .close-btn {
    color: #911b1b;
}

.alert-error .close-btn:hover {
    background: rgba(220, 38, 38, 0.1);
}

.alert-success {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-left: 3px solid var(--success-color);
    color: #14532d;
}

.alert-success i:first-child {
    color: var(--success-color);
}

.alert-success .close-btn {
    color: #14532d;
}

.alert-success .close-btn:hover {
    background: rgba(22, 163, 74, 0.1);
}

/* ---------------------------------------------------------------------- Form */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 11.5px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.07em;
    margin-bottom: 8px;
    color: var(--text-muted);
}

.form-group label i {
    margin-right: 6px;
    color: var(--primary-color);
    font-size: 12px;
}

.select-wrapper,
.input-wrapper {
    position: relative;
    flex-grow: 1;
    min-width: 0;
}

.input-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

select,
input {
    width: 100%;
    padding: 13px 44px 13px 15px;
    font-size: 14.5px;
    font-family: inherit;
    font-weight: 500;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: #fbfbfe;
    color: var(--text-main);
    transition: var(--transition);
    appearance: none;
    outline: none;
}

select:hover:not(:focus),
input:hover:not(:focus) {
    border-color: var(--border-strong);
}

select:focus,
input:focus {
    border-color: var(--primary-color);
    background-color: #fff;
    box-shadow: 0 0 0 4px var(--primary-ring);
}

input::placeholder {
    color: #a3a8bd;
    font-weight: 400;
    letter-spacing: 0;
}

select:invalid,
select option[disabled] {
    color: #a3a8bd;
}

/* OTP reads as a code, not prose */
#otp {
    letter-spacing: 0.12em;
    font-variant-numeric: tabular-nums;
}

.select-icon,
.input-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #9aa0b8;
    pointer-events: none;
    font-size: 13px;
    transition: var(--transition);
}

.select-wrapper:focus-within .select-icon,
.input-wrapper:focus-within .input-icon {
    color: var(--primary-color);
}

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

.btn-send-otp {
    padding: 13px 18px;
    background-color: var(--primary-light);
    color: var(--primary-dark);
    border: 1.5px solid #d6dafe;
    border-radius: var(--radius-md);
    font-size: 13.5px;
    font-family: inherit;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 108px;
}

.btn-send-otp:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 6px 14px -6px rgba(99, 102, 241, 0.6);
}

.btn-send-otp:active {
    transform: translateY(1px);
}

.btn-send-otp:disabled {
    opacity: 0.55;
    cursor: not-allowed;
    background-color: #f1f2f7;
    color: var(--text-muted);
    border-color: var(--border-color);
    box-shadow: none;
    transform: none;
}

.btn-send-otp.loading {
    pointer-events: none;
}

.btn-login {
    position: relative;
    overflow: hidden;
    width: 100%;
    margin-top: 4px;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-accent));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-btn);
}

/* Sheen sweep on hover */
.btn-login::after {
    content: '';
    position: absolute;
    top: 0;
    left: -120%;
    width: 60%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.28), transparent);
    transform: skewX(-20deg);
    transition: left 0.6s ease;
}

.btn-login:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-btn-hover);
}

.btn-login:hover::after {
    left: 130%;
}

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

.btn-login i {
    font-size: 13px;
    transition: transform 0.25s ease;
}

.btn-login:hover i {
    transform: translateX(3px);
}

.btn-login.loading {
    opacity: 0.85;
    pointer-events: none;
}

.btn-login.loading::after {
    display: none;
}

/* ------------------------------------------------------------------- Divider */

.divider {
    display: flex;
    align-items: center;
    text-align: center;
    margin: 24px 0;
    color: #9aa0b8;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.divider::before,
.divider::after {
    content: '';
    flex: 1;
    border-bottom: 1px solid var(--border-color);
}

.divider span {
    padding: 0 14px;
}

/* -------------------------------------------------------------------- Google */

.btn-google {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    width: 100%;
    padding: 13px;
    background: #fff;
    color: #33364d;
    border: 1.5px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14.5px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-google:hover {
    background: #fafbff;
    border-color: var(--border-strong);
    box-shadow: 0 6px 16px -10px rgba(22, 24, 43, 0.4);
    transform: translateY(-1px);
}

.btn-google:active {
    transform: translateY(0);
    background: #f4f5fa;
}

.btn-google svg {
    flex-shrink: 0;
}

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

.auth-footer {
    margin-top: 26px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
    font-size: 11.5px;
    line-height: 1.7;
    color: #8f95ab;
}

.auth-footer a {
    color: var(--primary-dark);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* ------------------------------------------------------------- Accessibility */

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

select:focus-visible,
input:focus-visible {
    outline: none;
}

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

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

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

@media (max-width: 520px) {
    .auth-card {
        padding: 32px 22px 26px;
        border-radius: 18px;
    }

    .auth-header h1 {
        font-size: 23px;
    }

    .input-group {
        flex-direction: column;
        align-items: stretch;
        gap: 10px;
    }

    .btn-send-otp {
        width: 100%;
    }
}