/* ---------------------------------------------------------------------
   Design tokens
--------------------------------------------------------------------- */
:root {
  color-scheme: dark;

  --bg: #121214;
  --bg-elevated: #17171a;
  --surface: #19191c;
  --surface-2: #222226;
  --surface-3: #2b2b30;
  --border: #303035;
  --border-strong: #3c3c42;

  --text: #f1f1f3;
  --text-muted: #a4a4ac;
  --text-faint: #717179;

  --accent: #ff5a1f;
  --accent-hover: #ff7440;
  --accent-active: #e04b15;
  --accent-text: #1a0a00;
  --accent-soft: rgba(255, 90, 31, 0.14);

  --danger: #f2555b;
  --danger-hover: #ff6c72;
  --danger-soft: rgba(242, 85, 91, 0.14);
  --success: #35c98d;
  --success-soft: rgba(53, 201, 141, 0.14);

  --radius-xs: 3px;
  --radius-sm: 5px;
  --radius-md: 7px;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.25);
  --shadow-sm: 0 2px 6px rgba(0, 0, 0, 0.25);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.25);

  --font:
    -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, "Helvetica Neue",
    Arial, sans-serif;

  font-family: var(--font);
}

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3 {
  font-weight: 600;
  line-height: 1.25;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.5rem;
}

h2 {
  font-size: 1.1rem;
}

p {
  margin: 0 0 0.75rem;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
}

button {
  font-family: inherit;
  color: inherit;
}

::selection {
  background: var(--accent);
  color: var(--accent-text);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--surface-3);
  border-radius: 999px;
  border: 2px solid var(--bg);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--border-strong);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

/* ---------------------------------------------------------------------
   App shell
--------------------------------------------------------------------- */
#app {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1.75rem 2rem 4rem;
}

.page-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.page-header h1 {
  margin: 0;
}

.page-header-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: -0.5rem 0 1.25rem;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 1rem;
}

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

.back-link svg {
  width: 16px;
  height: 16px;
}

/* ---------------------------------------------------------------------
   Top nav
--------------------------------------------------------------------- */
.top-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 2rem;
  background: rgba(18, 18, 20, 0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.top-nav-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  flex-shrink: 0;
}

.top-nav-brand-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
}

.top-nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.top-nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.7rem;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  font-size: 0.875rem;
  font-weight: 500;
  background: none;
  border: none;
  font-family: inherit;
  cursor: pointer;
  transition:
    background 0.12s ease,
    color 0.12s ease;
}

.top-nav-link svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.top-nav-link:hover {
  background: var(--surface-2);
  color: var(--text);
}

.top-nav-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.icon-btn.top-nav-menu-toggle {
  display: none;
}

@media (max-width: 720px) {
  .top-nav {
    padding: 0.75rem 1rem;
  }

  .icon-btn.top-nav-menu-toggle {
    display: inline-flex;
  }

  .top-nav-links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem;
    gap: 0.15rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition:
      transform 0.15s ease,
      opacity 0.15s ease;
  }

  .top-nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .top-nav-link {
    padding: 0.65rem 0.75rem;
  }
}

/* ---------------------------------------------------------------------
   Buttons
--------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 0.9rem;
  font-size: 0.875rem;
  font-weight: 500;
  font-family: inherit;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  white-space: nowrap;
  transition:
    background 0.12s ease,
    border-color 0.12s ease,
    transform 0.08s ease,
    box-shadow 0.12s ease;
}

form .btn {
  margin-top: 1rem;
}

.btn svg {
  width: 15px;
  height: 15px;
  flex-shrink: 0;
}

.btn:hover {
  background: var(--surface-3);
  border-color: var(--border-strong);
}

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

.btn:disabled {
  opacity: 0.5;
  cursor: default;
  pointer-events: none;
}

.btn-primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.btn-primary:hover {
  background: var(--accent-hover);
  border-color: var(--accent-hover);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.btn-danger {
  background: transparent;
  border-color: var(--danger);
  color: var(--danger);
}

.btn-danger:hover {
  background: var(--danger-soft);
  border-color: var(--danger-hover);
  color: var(--danger-hover);
}

.btn-ghost {
  background: transparent;
  border-color: transparent;
}

.btn-ghost:hover {
  background: var(--surface-2);
}

.btn-block {
  width: 100%;
}

.btn-sm {
  padding: 0.35rem 0.6rem;
  font-size: 0.8rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition:
    background 0.12s ease,
    color 0.12s ease,
    border-color 0.12s ease;
}

.icon-btn svg {
  width: 17px;
  height: 17px;
}

.icon-btn:hover {
  background: var(--surface-2);
  color: var(--text);
  border-color: var(--border);
}

.icon-btn:active {
  transform: scale(0.94);
}

.icon-btn:disabled {
  opacity: 0.35;
  cursor: default;
  pointer-events: none;
}

.icon-btn-danger:hover {
  background: var(--danger-soft);
  color: var(--danger-hover);
  border-color: transparent;
}

.icon-btn-accent {
  color: var(--accent);
}

.icon-btn-accent:hover {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.icon-btn-sm {
  width: 1.85rem;
  height: 1.85rem;
}

.icon-btn-sm svg {
  width: 15px;
  height: 15px;
}

/* ---------------------------------------------------------------------
   Forms
--------------------------------------------------------------------- */
.form-error,
.form-message.form-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin: 0.25rem 0 0.5rem;
}

.form-message.success {
  color: var(--success);
  font-size: 0.85rem;
  margin: 0 0 0.75rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  margin-bottom: 0.9rem;
}

.field:last-of-type {
  margin-bottom: 0;
}

.password-field {
  position: relative;
  display: flex;
}

.password-field input {
  padding-right: 2.4rem;
}

.password-field-toggle {
  position: absolute;
  top: 50%;
  right: 0.25rem;
  transform: translateY(-50%);
  width: 1.85rem;
  height: 1.85rem;
}

.icon-btn.password-field-toggle:active {
  transform: translateY(-50%) scale(0.94);
}

.password-field-toggle svg {
  width: 15px;
  height: 15px;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="datetime-local"],
input[type="file"],
textarea,
select {
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.65rem;
  transition:
    border-color 0.12s ease,
    background 0.12s ease;
  width: 100%;
}

textarea {
  resize: vertical;
  font-family: inherit;
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--border-strong);
}

input:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface-3);
}

input:disabled,
textarea:disabled,
select:disabled {
  opacity: 0.55;
}

select {
  cursor: pointer;
}

input[type="checkbox"] {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
  cursor: pointer;
}

.inline-checkbox {
  flex-direction: row !important;
  align-items: center;
  gap: 0.5rem !important;
}

.user-form,
.profile-form,
.album-form,
.share-form,
.invite-form {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.form-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

/* ---------------------------------------------------------------------
   Surfaces / cards
--------------------------------------------------------------------- */
.surface-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
}

.section {
  margin: 0 0 2rem;
}

.profile-card {
  padding: 1rem 1.1rem;
  margin: 0 0 1rem;
  max-width: 460px;
}

.profile-card-row {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.profile-card-row > div {
  flex: 1;
  min-width: 0;
}

.profile-card-icon {
  width: 20px;
  height: 20px;
  color: var(--text-faint);
  flex-shrink: 0;
}

.profile-card-name {
  margin: 0 0 0.15rem;
  font-weight: 600;
  font-size: 0.9rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.profile-card-email {
  margin: 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.section-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

/* ---------------------------------------------------------------------
   Empty / loading states
--------------------------------------------------------------------- */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
  border: 1px dashed var(--border);
  border-radius: var(--radius-md);
}

.empty-state svg {
  width: 32px;
  height: 32px;
  color: var(--text-faint);
  margin-bottom: 0.25rem;
}

.loading-state {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 1.5rem 0;
}

.spinner {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  background: var(--surface-3);
  color: var(--text-muted);
}

.badge-accent {
  background: var(--accent-soft);
  color: var(--accent-hover);
}

.badge svg {
  width: 11px;
  height: 11px;
}

/* ---------------------------------------------------------------------
   Modal
--------------------------------------------------------------------- */
.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(8, 8, 9, 0.72);
  backdrop-filter: blur(3px);
  animation: modal-fade 0.15s ease;
}

@keyframes modal-fade {
  from {
    opacity: 0;
  }
}

.modal {
  width: min(460px, 100%);
  max-height: min(88vh, 720px);
  display: flex;
  flex-direction: column;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  animation: modal-pop 0.16s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.modal-wide {
  width: min(600px, 100%);
}

@keyframes modal-pop {
  from {
    opacity: 0;
    transform: translateY(6px) scale(0.98);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-header h2 {
  margin: 0;
  font-size: 1rem;
}

.modal-body {
  padding: 1.1rem;
  overflow-y: auto;
  flex: 1;
  min-height: 0;
}

.modal-footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.9rem 1.1rem;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

.modal-footer-split {
  justify-content: space-between;
}

.modal-confirm-text {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

/* ---------------------------------------------------------------------
   Toasts
--------------------------------------------------------------------- */
.toast-stack {
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 3000;
  display: flex;
  flex-direction: column-reverse;
  gap: 0.6rem;
  width: min(340px, calc(100vw - 2rem));
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.7rem 0.8rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-left: 3px solid var(--text-faint);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  font-size: 0.85rem;
  pointer-events: auto;
  animation: toast-in 0.18s cubic-bezier(0.2, 0.7, 0.3, 1);
}

.toast.is-leaving {
  animation: toast-out 0.15s ease forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(12px);
  }
}

@keyframes toast-out {
  to {
    opacity: 0;
    transform: translateX(12px);
  }
}

.toast-icon {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  margin-top: 0.05rem;
}

.toast-message {
  flex: 1;
  color: var(--text);
  line-height: 1.4;
  word-break: break-word;
}

.toast-close {
  flex-shrink: 0;
  width: 1.4rem;
  height: 1.4rem;
}

.toast-close svg {
  width: 12px;
  height: 12px;
}

.toast-success {
  border-left-color: var(--success);
}

.toast-success .toast-icon {
  color: var(--success);
}

.toast-error {
  border-left-color: var(--danger);
}

.toast-error .toast-icon {
  color: var(--danger);
}

.toast-info .toast-icon {
  color: var(--accent);
}

/* ---------------------------------------------------------------------
   Responsive
--------------------------------------------------------------------- */
@media (max-width: 720px) {
  #app {
    padding: 1.25rem 1rem 3rem;
  }

  .toast-stack {
    left: 1rem;
    right: 1rem;
    bottom: 1rem;
    width: auto;
  }
}