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

:root {
    --white: #ffffff;
    --paper: #f6f4ee;
    --line: #ddd7ca;
    --muted: #706d65;
    --ink: #1d1c18;
    --pine: #294738;
    --pine-soft: #e5eee7;
    --amber: #9a6a2f;
    --danger: #9f3e35;
    --radius: 8px;
    --shadow: 0 18px 50px rgba(29, 28, 24, 0.11);
}

html {
    font-size: 16px;
}

body {
    min-height: 100vh;
    font-family: "DM Sans", sans-serif;
    background:
        linear-gradient(90deg, rgba(246, 244, 238, 0.92) 0%, rgba(246, 244, 238, 0.78) 48%, rgba(246, 244, 238, 0.9) 100%),
        url("../background.jpeg") center / cover fixed;
    color: var(--ink);
    position: relative;
}

button,
input {
    font: inherit;
}

.topbar {
    position: fixed;
    inset: 0 0 auto;
    z-index: 20;
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem clamp(1rem, 4vw, 3rem);
    background: rgba(246, 244, 238, 0.82);
    border-bottom: 1px solid rgba(29, 28, 24, 0.08);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}

.nav-brand {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--ink);
    text-decoration: none;
}

.nav-brand-mark {
    width: 34px;
    height: 34px;
    border-radius: var(--radius);
    background: var(--pine);
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.nav-brand-mark svg {
    width: 18px;
    height: 18px;
}

.nav-brand-name {
    font-family: "Syne", sans-serif;
    font-weight: 700;
    font-size: 1rem;
}

.nav-actions,
.auth-tabs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-btn,
.auth-tab,
.form-submit {
    min-height: 42px;
    border: 0;
    border-radius: var(--radius);
    cursor: pointer;
    font-weight: 600;
    transition: background 0.18s, color 0.18s, border-color 0.18s, transform 0.18s;
}

.nav-btn {
    padding: 0 1rem;
    background: var(--pine);
    color: var(--white);
}

.nav-btn.ghost {
    background: var(--white);
    color: var(--ink);
    border: 1px solid var(--line);
}

.nav-btn:hover,
.form-submit:hover {
    transform: translateY(-1px);
}

.auth-page {
    min-height: 100vh;
    padding: 96px clamp(1rem, 4vw, 3rem) 24px;
    display: grid;
    grid-template-columns: minmax(280px, 0.88fr) minmax(320px, 420px);
    align-items: center;
    justify-content: center;
    gap: clamp(1.5rem, 5vw, 5rem);
}

.intro-panel {
    max-width: 620px;
}

.intro-kicker,
.login-eyebrow {
    color: var(--pine);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.intro-copy h1 {
    max-width: 560px;
    margin-top: 0.8rem;
    font-family: "Syne", sans-serif;
    font-size: clamp(2.35rem, 6vw, 4.8rem);
    line-height: 1.02;
    letter-spacing: 0;
}

.intro-text {
    max-width: 480px;
    margin-top: 1.1rem;
    color: var(--muted);
    font-size: 1.05rem;
    line-height: 1.65;
}

.quick-preview {
    max-width: 460px;
    margin-top: 2rem;
    background: rgba(255, 255, 255, 0.92);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    box-shadow: 0 10px 30px rgba(29, 28, 24, 0.07);
    overflow: hidden;
}

.preview-header,
.preview-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.preview-header {
    padding: 0.95rem 1rem;
    background: var(--pine);
    color: var(--white);
}

.preview-header span,
.preview-row span {
    color: inherit;
    opacity: 0.74;
    font-size: 0.84rem;
}

.preview-header strong,
.preview-row strong {
    font-family: "Syne", sans-serif;
    font-size: 0.92rem;
    text-align: right;
}

.preview-row {
    padding: 0.85rem 1rem;
    border-top: 1px solid var(--line);
}

.preview-row span {
    color: var(--muted);
}

.auth-panel {
    width: 100%;
}

.flash-list {
    display: grid;
    gap: 0.55rem;
    margin-bottom: 0.9rem;
}

.flash-message {
    border: 1px solid rgba(41, 71, 56, 0.2);
    border-radius: var(--radius);
    background: var(--pine-soft);
    color: var(--pine);
    padding: 0.75rem 0.9rem;
    font-size: 0.88rem;
}

.flash-message.error {
    border-color: rgba(159, 62, 53, 0.24);
    background: rgba(159, 62, 53, 0.08);
    color: var(--danger);
}

.auth-tabs {
    width: 100%;
    padding: 0.35rem;
    margin-bottom: 0.8rem;
    background: #ebe6dc;
    border: 1px solid var(--line);
    border-radius: var(--radius);
}

.auth-tab {
    flex: 1;
    background: transparent;
    color: var(--muted);
    padding: 0 0.8rem;
}

.auth-tab.active {
    background: var(--white);
    color: var(--ink);
    box-shadow: 0 1px 6px rgba(29, 28, 24, 0.08);
}

.login-card {
    display: none;
    width: 100%;
    min-height: 390px;
    background: rgba(255, 255, 255, 0.95);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: clamp(1.25rem, 3vw, 1.7rem);
    box-shadow: var(--shadow);
}

.login-card.active {
    display: block;
}

.form-heading {
    margin-bottom: 1.3rem;
}

.login-title {
    margin-top: 0.3rem;
    font-family: "Syne", sans-serif;
    font-size: 1.65rem;
    line-height: 1.1;
}

.form-field {
    margin-bottom: 0.9rem;
}

.form-label {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--ink);
    font-size: 0.82rem;
    font-weight: 600;
}

.form-input {
    width: 100%;
    min-height: 46px;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    background: #fbfaf7;
    color: var(--ink);
    padding: 0 0.9rem;
    outline: none;
    transition: border-color 0.18s, box-shadow 0.18s;
}

.form-input:focus {
    border-color: var(--pine);
    box-shadow: 0 0 0 3px rgba(41, 71, 56, 0.13);
}

.form-input::placeholder {
    color: #aaa398;
}

.form-submit {
    width: 100%;
    margin-top: 0.4rem;
    background: var(--pine);
    color: var(--white);
}

@media (max-width: 840px) {
    .topbar {
        min-height: 66px;
        padding: 0.8rem 1rem;
    }

    .nav-actions {
        gap: 0.35rem;
    }

    .nav-btn {
        padding: 0 0.75rem;
    }

    .auth-page {
        min-height: auto;
        padding: 88px 1rem 1rem;
        grid-template-columns: 1fr;
        align-items: start;
        gap: 1rem;
    }

    .auth-panel {
        order: -1;
    }

    .intro-panel {
        max-width: none;
    }

    .intro-copy h1 {
        font-size: clamp(2rem, 10vw, 3.2rem);
    }

    .intro-text {
        margin-top: 0.75rem;
        font-size: 0.98rem;
    }

    .quick-preview {
        display: none;
    }

    .login-card {
        min-height: 0;
    }
}

@media (max-width: 430px) {
    .nav-brand-name {
        display: none;
    }

    .nav-btn {
        min-height: 40px;
        font-size: 0.88rem;
    }

    .auth-page {
        padding-top: 80px;
    }
}